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      "text": "TuxCare License Agreement",
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      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
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      {
        "category": "details",
        "text": "Fix CVE-2026-63381 - use-after-free in evbuffer_add_buffer_reference()\n- Fix CVE-2026-63385 - HTTP header injection via CR/LF in header values\n- Fix CVE-2026-63382 - HTTP request smuggling via Transfer-Encoding\n  handling and bare-LF chunk framing\n- Fix CVE-2026-63379 - HTTP header smuggling via chunked trailers",
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          "number": "1",
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    "title": "libevent: Fix of 8 CVEs"
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          "category": "description",
          "text": "Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has a use-after-free in buffer.c when evbuffer_add_buffer_reference processes an output buffer whose out_total_len is zero. evbuffer_free_all_chains frees the initial empty chain without resetting outbuf->first, outbuf->last, or outbuf->last_with_datap, and APPEND_CHAIN_MULTICAST subsequently dereferences the dangling chain pointer. A caller that can drive this buffer state can cause memory corruption or a process crash. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.",
          "title": "Vulnerability description"
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          "title": "Vulnerability description"
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-63385"
        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/commit/758be0c0f69c1934ef9a84ab39e9f9e5fde2e6d0",
          "url": "https://github.com/libevent/libevent/commit/758be0c0f69c1934ef9a84ab39e9f9e5fde2e6d0"
        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/commit/9170dd35e64714613e8d13b290587cfc28e258e2",
          "url": "https://github.com/libevent/libevent/commit/9170dd35e64714613e8d13b290587cfc28e258e2"
        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable",
          "url": "https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable"
        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha",
          "url": "https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha"
        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/security/advisories/GHSA-jcwh-pvf2-73p2",
          "url": "https://github.com/libevent/libevent/security/advisories/GHSA-jcwh-pvf2-73p2"
        }
      ],
      "release_date": "2026-08-20T18:16:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-28T09:28:56.586531Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1790587734",
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            "Rocky Linux-9.6:libevent-0:2.1.12-8.el9_6.tuxcare.els2.x86_64",
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            "Rocky Linux-9.6:libevent-doc-0:2.1.12-8.el9_6.tuxcare.els2.noarch"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1790587734"
        }
      ],
      "threats": [
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          "category": "impact",
          "details": "Important"
        }
      ]
    },
    {
      "cve": "CVE-2026-63383",
      "cwe": {
        "id": "CWE-125",
        "name": "Out-of-bounds Read"
      },
      "notes": [
        {
          "category": "description",
          "text": "Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent can read beyond a contiguous evbuffer region in event_tagging.c when decode_tag_internal requests at most five bytes from evbuffer_pullup but iterates using the full logical buffer length. A fragmented evbuffer containing a six-byte malformed tag can therefore advance past the pullup window and trigger an out-of-bounds read, which can crash a process that decodes attacker-controlled tagged RPC data. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.",
          "title": "Vulnerability description"
        }
      ],
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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-63383"
        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/commit/91ed8745eebabdd27592a83d350338a8c4626321",
          "url": "https://github.com/libevent/libevent/commit/91ed8745eebabdd27592a83d350338a8c4626321"
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        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/commit/e1f9e21887c6b104e206a718385ba3ffc75180cb",
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          "category": "external",
          "summary": "https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable",
          "url": "https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable"
        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha",
          "url": "https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha"
        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/security/advisories/GHSA-fj29-64w6-73h6",
          "url": "https://github.com/libevent/libevent/security/advisories/GHSA-fj29-64w6-73h6"
        }
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      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-28T09:28:56.586531Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1790587734",
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            "Rocky Linux-9.6:libevent-0:2.1.12-8.el9_6.tuxcare.els2.x86_64",
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            "Rocky Linux-9.6:libevent-doc-0:2.1.12-8.el9_6.tuxcare.els2.noarch"
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          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1790587734"
        }
      ],
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          "details": "Important"
        }
      ]
    },
    {
      "cve": "CVE-2026-63384",
      "cwe": {
        "id": "CWE-190",
        "name": "Integer Overflow or Wraparound"
      },
      "notes": [
        {
          "category": "description",
          "text": "Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has an incorrect integer conversion in event_tagging.c when evtag_unmarshal_header uses evtag_decode_int to decode an attacker-controlled uint32 payload length and returns it as a signed int. Values above INT_MAX become negative or truncated, and evtag_unmarshal_string can use the converted value in allocation sizing, producing a wrapped large allocation request and denial of service. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.",
          "title": "Vulnerability description"
        }
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        ]
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-63384"
        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/commit/109c16499282959d70f56ec3baf4c8b1e6646bda",
          "url": "https://github.com/libevent/libevent/commit/109c16499282959d70f56ec3baf4c8b1e6646bda"
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          "category": "external",
          "summary": "https://github.com/libevent/libevent/commit/5e3c6ebe342b34c5a9bcf48e9a32ad6708b9c416",
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          "category": "external",
          "summary": "https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable",
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          "summary": "https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha",
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        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/security/advisories/GHSA-45c6-qx49-89m8",
          "url": "https://github.com/libevent/libevent/security/advisories/GHSA-45c6-qx49-89m8"
        }
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        {
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          "date": "2026-09-28T09:28:56.586531Z",
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            "Rocky Linux-9.6:libevent-0:2.1.12-8.el9_6.tuxcare.els2.x86_64",
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            "Rocky Linux-9.6:libevent-doc-0:2.1.12-8.el9_6.tuxcare.els2.noarch"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1790587734"
        }
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          "details": "Important"
        }
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    {
      "cve": "CVE-2026-63388",
      "cwe": {
        "id": "CWE-617",
        "name": "Reachable Assertion"
      },
      "notes": [
        {
          "category": "description",
          "text": "Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has a heap out-of-bounds write in bufferevent_sock.c when bufferevent_socket_set_conn_address_ copies a kernel-supplied AF_UNIX peer address into bufferevent_private.conn_address. Release builds compiled with NDEBUG disable the EVUTIL_ASSERT length guard, and the evhttp accept path can pass a 110-byte sockaddr from accept() into the 28-byte field. An unauthenticated local peer able to connect to an AF_UNIX listener can overwrite the adjacent dns_request pointer and heap data, causing memory corruption with confidentiality, integrity, and availability impact. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.",
          "title": "Vulnerability description"
        }
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        ]
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-63388"
        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/commit/52057cb33d0c20c0a0453fbabe6c0c96854931b9",
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          "url": "https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha"
        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/security/advisories/GHSA-cvq5-vrvr-j338",
          "url": "https://github.com/libevent/libevent/security/advisories/GHSA-cvq5-vrvr-j338"
        }
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      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-28T09:28:56.586531Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1790587734",
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            "Rocky Linux-9.6:libevent-0:2.1.12-8.el9_6.tuxcare.els2.x86_64",
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            "Rocky Linux-9.6:libevent-doc-0:2.1.12-8.el9_6.tuxcare.els2.noarch"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1790587734"
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    },
    {
      "cve": "CVE-2026-63387",
      "cwe": {
        "id": "CWE-121",
        "name": "Stack-based Buffer Overflow"
      },
      "notes": [
        {
          "category": "description",
          "text": "Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has an off-by-one stack buffer overflow in evdns.c when dnsname_to_labels formats a name-bearing DNS record at the end of the 64 KB stack buffer allocated by evdns_server_request_format_response. The final-label check permits j plus label_len plus one to equal buf_len, after which the terminating null byte is written to buf[buf_len]. A crafted DNS server response containing PTR, CNAME, MX, NS, or SOA data can trigger the one-byte out-of-bounds write and crash or corrupt the process. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.",
          "title": "Vulnerability description"
        }
      ],
      "product_status": {
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-63387"
        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable",
          "url": "https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable"
        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha",
          "url": "https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha"
        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/security/advisories/GHSA-58rx-7448-jw47",
          "url": "https://github.com/libevent/libevent/security/advisories/GHSA-58rx-7448-jw47"
        }
      ],
      "release_date": "2026-08-20T18:16:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-28T09:28:56.586531Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1790587734",
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            "AlmaLinux-9.6:libevent-0:2.1.12-8.el9_6.tuxcare.els2.aarch64",
            "AlmaLinux-9.6:libevent-0:2.1.12-8.el9_6.tuxcare.els2.i686",
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            "Rocky Linux-9.6:libevent-0:2.1.12-8.el9_6.tuxcare.els2.x86_64",
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            "Rocky Linux-9.6:libevent-devel-0:2.1.12-8.el9_6.tuxcare.els2.x86_64",
            "Rocky Linux-9.6:libevent-doc-0:2.1.12-8.el9_6.tuxcare.els2.noarch"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1790587734"
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    },
    {
      "cve": "CVE-2026-63379",
      "cwe": {
        "id": "CWE-444",
        "name": "Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')"
      },
      "notes": [
        {
          "category": "description",
          "text": "Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent processes chunked HTTP trailers in http.c through evhttp_read_trailer and merges them into request headers. The fix introduces evhttp_parse_headers_impl_ and a temporary trailer header list. An unauthenticated remote attacker can place security-sensitive fields in trailers so that an upstream proxy and the libevent application interpret different effective headers, enabling header smuggling, authorization bypass, proxy-header spoofing, or cache poisoning. The fix parses trailers into a temporary header list and discards them instead of merging them into req->input_headers. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.",
          "title": "Vulnerability description"
        }
      ],
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-63379"
        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/commit/87e8e44fa774e9677b089b1a5114ee68aefa1636",
          "url": "https://github.com/libevent/libevent/commit/87e8e44fa774e9677b089b1a5114ee68aefa1636"
        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/commit/b847071141b3827900d536594ec9045eb0a4c485",
          "url": "https://github.com/libevent/libevent/commit/b847071141b3827900d536594ec9045eb0a4c485"
        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable",
          "url": "https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable"
        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha",
          "url": "https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha"
        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/security/advisories/GHSA-2gmv-p5m7-98p6",
          "url": "https://github.com/libevent/libevent/security/advisories/GHSA-2gmv-p5m7-98p6"
        }
      ],
      "release_date": "2026-08-20T18:16:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-28T09:28:56.586531Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1790587734",
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            "AlmaLinux-9.6:libevent-0:2.1.12-8.el9_6.tuxcare.els2.aarch64",
            "AlmaLinux-9.6:libevent-0:2.1.12-8.el9_6.tuxcare.els2.i686",
            "AlmaLinux-9.6:libevent-0:2.1.12-8.el9_6.tuxcare.els2.x86_64",
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            "Rocky Linux-9.6:libevent-0:2.1.12-8.el9_6.tuxcare.els2.i686",
            "Rocky Linux-9.6:libevent-0:2.1.12-8.el9_6.tuxcare.els2.x86_64",
            "Rocky Linux-9.6:libevent-devel-0:2.1.12-8.el9_6.tuxcare.els2.aarch64",
            "Rocky Linux-9.6:libevent-devel-0:2.1.12-8.el9_6.tuxcare.els2.i686",
            "Rocky Linux-9.6:libevent-devel-0:2.1.12-8.el9_6.tuxcare.els2.x86_64",
            "Rocky Linux-9.6:libevent-doc-0:2.1.12-8.el9_6.tuxcare.els2.noarch"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1790587734"
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    },
    {
      "cve": "CVE-2026-63382",
      "cwe": {
        "id": "CWE-444",
        "name": "Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')"
      },
      "notes": [
        {
          "category": "description",
          "text": "Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header, evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy that frames the same request differently, an unauthenticated remote attacker can desynchronize request boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.",
          "title": "Vulnerability description"
        }
      ],
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        ]
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-63382"
        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/commit/10abb34b8dc3e1184de315dd261ce4b77563cda6",
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        },
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        },
        {
          "category": "external",
          "summary": "https://github.com/libevent/libevent/security/advisories/GHSA-q39v-w2g7-gr8j",
          "url": "https://github.com/libevent/libevent/security/advisories/GHSA-q39v-w2g7-gr8j"
        }
      ],
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      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-28T09:28:56.586531Z",
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          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1790587734"
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    }
  ]
}