High [CVE-2026-83617] @xmldom/xmldom: xmldom: XML injection via embedded line terminator in element/attribute names
This high-severity Red Hat Linux advisory covers CVE-2026-83617 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat Fuse 7.
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Summary
xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.9.11 until 0.9.12, the requireWellFormed: true element and attribute name checks use the anchored QName_exact expression produced by reg() in lib/grammar.js, which inherits the multiline flag.
A name with a valid first line followed by U+000A, U+000D, U+2028, or U+2029 and breakout markup therefore passes validation and is emitted verbatim in element start and end tags or attribute names.
This bypasses the strict-serialization checks introduced for the earlier element-name and attribute-name injection advisories, while the default serialization path remains outside the strict guarantee. This issue is fixed in @xmldom/xmldom version 0.9.12.
A flaw was found in the @xmldom/xmldom library. The requireWellFormed validation for XML element and attribute names can be bypassed by embedding specific line terminator characters.
This allows an attacker to inject malformed XML into the document, potentially leading to XML injection vulnerabilities and bypassing security checks designed to prevent such issues. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N).
Weakness: CWE-91. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Fuse 7; Red Hat OpenShift AI (RHOAI).
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
Mitigation
Upgrade to a fixed release: 0.9.12. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
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