{ "document": { "aggregate_severity": { "text": "Important" }, "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "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" }, { "category": "details", "text": "CVE-2026-39821: reject Punycode labels that decode to an all-ASCII label in\n Profile.process() of the vendored golang.org/x/net/idna", "title": "Details" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "https://cve.tuxcare.com/els/releases/CLSA-2026:1789376503", "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1789376503" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/tuxcare9.6esu/advisories/2026/clsa-2026_1789376503.json" } ], "tracking": { "current_release_date": "2026-09-14T09:02:21Z", "generator": { "date": "2026-09-14T09:02:21Z", "engine": { "name": "pyCSAF" } }, "id": "CLSA-2026:1789376503", "initial_release_date": "2026-09-14T09:02:21Z", "revision_history": [ { "date": "2026-09-14T09:02:21Z", "number": "1", "summary": "Initial version" } ], "status": "final", "version": "1" }, "title": "ignition: Fix of CVE-2026-39821" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "AlmaLinux 9.6", "product": { "name": "AlmaLinux 9.6", "product_id": "AlmaLinux-9.6", "product_identification_helper": { "cpe": "cpe:2.3:o:almalinux:almalinux:9.6:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "AlmaLinux" } ], "category": "vendor", "name": "AlmaLinux OS Foundation" }, { "branches": [ { "branches": [ { "category": "product_name", "name": "Rocky Linux 9.6", "product": { "name": "Rocky Linux 9.6", "product_id": "Rocky Linux-9.6", "product_identification_helper": { "cpe": "cpe:2.3:o:resf:rocky_linux:9.6:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Rocky Linux" } ], "category": "vendor", "name": "Rocky Linux" }, { "branches": [ { "branches": [ { "category": "product_version", "name": "ignition-edge-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "product": { "name": "ignition-edge-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "product_id": "ignition-edge-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/ignition-edge@2.21.0-1.el9_6.tuxcare.els1?arch=x86_64" } } }, { "category": "product_version", "name": "ignition-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "product": { "name": "ignition-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "product_id": "ignition-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/ignition@2.21.0-1.el9_6.tuxcare.els1?arch=x86_64" } } }, { "category": "product_version", "name": "ignition-validate-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "product": { "name": "ignition-validate-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "product_id": 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"relates_to_product_reference": "AlmaLinux-9.6" }, { "category": "default_component_of", "full_product_name": { "name": "ignition-0:2.21.0-1.el9_6.tuxcare.els1.x86_64 as a component of AlmaLinux 9.6", "product_id": "AlmaLinux-9.6:ignition-0:2.21.0-1.el9_6.tuxcare.els1.x86_64" }, "product_reference": "ignition-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "relates_to_product_reference": "AlmaLinux-9.6" }, { "category": "default_component_of", "full_product_name": { "name": "ignition-validate-0:2.21.0-1.el9_6.tuxcare.els1.x86_64 as a component of AlmaLinux 9.6", "product_id": "AlmaLinux-9.6:ignition-validate-0:2.21.0-1.el9_6.tuxcare.els1.x86_64" }, "product_reference": "ignition-validate-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "relates_to_product_reference": "AlmaLinux-9.6" }, { "category": "default_component_of", "full_product_name": { "name": "ignition-grub-0:2.21.0-1.el9_6.tuxcare.els1.x86_64 as a component of AlmaLinux 9.6", "product_id": "AlmaLinux-9.6:ignition-grub-0:2.21.0-1.el9_6.tuxcare.els1.x86_64" }, "product_reference": "ignition-grub-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "relates_to_product_reference": "AlmaLinux-9.6" }, { "category": "default_component_of", "full_product_name": { "name": "ignition-edge-0:2.21.0-1.el9_6.tuxcare.els1.x86_64 as a component of Rocky Linux 9.6", "product_id": "Rocky Linux-9.6:ignition-edge-0:2.21.0-1.el9_6.tuxcare.els1.x86_64" }, "product_reference": "ignition-edge-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "relates_to_product_reference": "Rocky Linux-9.6" }, { "category": "default_component_of", "full_product_name": { "name": "ignition-0:2.21.0-1.el9_6.tuxcare.els1.x86_64 as a component of Rocky Linux 9.6", "product_id": "Rocky Linux-9.6:ignition-0:2.21.0-1.el9_6.tuxcare.els1.x86_64" }, "product_reference": "ignition-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "relates_to_product_reference": "Rocky Linux-9.6" }, { "category": "default_component_of", "full_product_name": { "name": "ignition-validate-0:2.21.0-1.el9_6.tuxcare.els1.x86_64 as a component of Rocky Linux 9.6", "product_id": "Rocky Linux-9.6:ignition-validate-0:2.21.0-1.el9_6.tuxcare.els1.x86_64" }, "product_reference": "ignition-validate-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "relates_to_product_reference": "Rocky Linux-9.6" }, { "category": "default_component_of", "full_product_name": { "name": "ignition-grub-0:2.21.0-1.el9_6.tuxcare.els1.x86_64 as a component of Rocky Linux 9.6", "product_id": "Rocky Linux-9.6:ignition-grub-0:2.21.0-1.el9_6.tuxcare.els1.x86_64" }, "product_reference": "ignition-grub-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "relates_to_product_reference": "Rocky Linux-9.6" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-39821", "cwe": { "id": "CWE-1289", "name": "Improper Validation of Unsafe Equivalence in Input" }, "notes": [ { "category": "description", "text": "The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode(\"xn--example-.com\") incorrectly returns the name \"example.com\" rather than an error. This behavior can lead to privilege escalation in programs using the idna package. For example, a program which performs privilege checks on the ASCII hostname may reject \"example.com\" but permit \"xn--example-.com\". If that program subsequently converts the ASCII hostname to Unicode, it will inadvertently permits access to the Unicode name \"example.com\".", "title": "Vulnerability description" } ], "product_status": { "fixed": [ "AlmaLinux-9.6:ignition-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "AlmaLinux-9.6:ignition-edge-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "AlmaLinux-9.6:ignition-grub-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "AlmaLinux-9.6:ignition-validate-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "Rocky Linux-9.6:ignition-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "Rocky Linux-9.6:ignition-edge-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "Rocky Linux-9.6:ignition-grub-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "Rocky Linux-9.6:ignition-validate-0:2.21.0-1.el9_6.tuxcare.els1.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-39821" }, { "category": "external", "summary": "https://go.dev/cl/767220", "url": "https://go.dev/cl/767220" }, { "category": "external", "summary": "https://go.dev/issue/78760", "url": "https://go.dev/issue/78760" }, { "category": "external", "summary": "https://groups.google.com/g/golang-announce/c/94pEornpRlI", "url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI" }, { "category": "external", "summary": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8", "url": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8" }, { "category": "external", "summary": "https://pkg.go.dev/vuln/GO-2026-5026", "url": "https://pkg.go.dev/vuln/GO-2026-5026" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:23262", "url": "https://access.redhat.com/errata/RHSA-2026:23262" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:23264", "url": "https://access.redhat.com/errata/RHSA-2026:23264" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:26546", "url": 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"category": "vendor_fix", "date": "2026-09-14T09:01:44.938296Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1789376503", "product_ids": [ "AlmaLinux-9.6:ignition-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "AlmaLinux-9.6:ignition-edge-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "AlmaLinux-9.6:ignition-grub-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "AlmaLinux-9.6:ignition-validate-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "Rocky Linux-9.6:ignition-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "Rocky Linux-9.6:ignition-edge-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "Rocky Linux-9.6:ignition-grub-0:2.21.0-1.el9_6.tuxcare.els1.x86_64", "Rocky Linux-9.6:ignition-validate-0:2.21.0-1.el9_6.tuxcare.els1.x86_64" ], "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1789376503" } ], "threats": [ { "category": "impact", "details": "Important" } ] } ] }