CVE-2026-83616xmldom: Processing Instruction Target Injection Bypasses requireWellFormed
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom version 0.6.0 and earlier, Document.createProcessingInstruction(target, data) in lib/dom.js accepts an unvalidated target, while the requireWellFormed: true serializer checks only for a colon and the reserved case-insensitive xml name on 0.9.x and performs no target check on 0.8.x. Because serialization emits <?target data?>, a target containing >, ?, whitespace, or another invalid XML-name character can break the processing-instruction boundary and inject XML structure. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.
- CVSS
- 8.7 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
- Weakness (CWE)
- CWE-91
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Sep 1, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
xmldom xmldom xmldom:xmldom (from the name) | through 0.6.0 | CNA record |
References
- https://github.com/xmldom/xmldom/security/advisories/GHSA-c7q8-3ch8-vqpvx-refsource-confirm
- https://github.com/xmldom/xmldom/pull/1071x-refsource-misc
- https://github.com/xmldom/xmldom/pull/1072x-refsource-misc
- https://github.com/xmldom/xmldom/commit/1cde3e31a07c41c87cfd368d6946aa477f16b4f9x-refsource-misc
- https://github.com/xmldom/xmldom/commit/3b694872bcb5c7e3cbadba961a4be2488750ce5bx-refsource-misc
- https://github.com/xmldom/xmldom/releases/tag/0.8.15x-refsource-misc
- https://github.com/xmldom/xmldom/releases/tag/0.9.12x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.