CVE-2026-83606
Severity not reportedxmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module.
xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.9.0-beta.9 until 0.9.11, the processing-instruction production in lib/grammar.js lets the greedy S+ separator and lazy Char*? data group repeatedly repartition a long whitespace tail when the required closing ?> is absent. Both parsePI and parseProcessingInstruction apply the expression to the entire remaining source, causing quadratic backtracking during DOMParser.parseFromString() under default options and allowing a small unauthenticated XML input to stall the Node.js event loop. This issue is fixed in @xmldom/xmldom version 0.9.11.
Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/xmldom/xmldom/commit/73df6b8bdbd86f904b9e8c3ab9c49aa54ef2802e security-advisories@github.com
- https://github.com/xmldom/xmldom/pull/1039 security-advisories@github.com
- https://github.com/xmldom/xmldom/releases/tag/0.9.11 security-advisories@github.com
- https://github.com/xmldom/xmldom/security/advisories/GHSA-g53g-w8rj-fmg7 security-advisories@github.com
- https://github.com/xmldom/xmldom/security/advisories/GHSA-g53g-w8rj-fmg7 134c704f-9b21-4f2e-91b3-4a467353bcc0