Vulnerability · Published Sep 1, 2026 · Assigned by GitHub_M
CVE-2026-83613xmldom: Quadratic-time attribute deduplication
High 8.7
In plain English
A high-severity security flaw in xmldom from xmldom. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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, DOMHandler.startElement in lib/dom-parser.js inserts every parsed attribute through setAttributeNode, while NamedNodeMap.setNamedItem in lib/dom.js calls the linear getNamedItem or getNamedItemNS lookup for each insertion. A well-formed element with many distinct attributes therefore requires quadratic comparisons during DOMParser.parseFromString() and can stall a Node.js event loop before application validation. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | node-xmldom | no fix listed | DEBIAN-CVE-2026-83613 |
| Debian:13 | node-xmldom | no fix listed | DEBIAN-CVE-2026-83613 |
| Debian:14 | node-xmldom | 0.9.12-1 | DEBIAN-CVE-2026-83613 |
| Ubuntu:22.04:LTS | node-xmldom | no fix listed | UBUNTU-CVE-2026-83613 |
| Ubuntu:24.04:LTS | node-xmldom | no fix listed | UBUNTU-CVE-2026-83613 |
| Ubuntu:26.04:LTS | node-xmldom | no fix listed | UBUNTU-CVE-2026-83613 |
| Ubuntu:26.10 | node-xmldom | no fix listed | UBUNTU-CVE-2026-83613 |
| npm | @xmldom/xmldom | 0.8.15 | GHSA-8344-3jmq-59r6 |
| npm | @xmldom/xmldom | 0.9.12 | GHSA-8344-3jmq-59r6 |
| npm | xmldom | no fix listed | GHSA-8344-3jmq-59r6 |
Affected products (as reported)
Weakness: CWE-407 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References
- https://github.com/xmldom/xmldom/security/advisories/GHSA-8344-3jmq-59r6 x_refsource_CONFIRM
- https://github.com/xmldom/xmldom/pull/1071 x_refsource_MISC
- https://github.com/xmldom/xmldom/pull/1072 x_refsource_MISC
- https://github.com/xmldom/xmldom/commit/2c548f200cfec991cd5846627ef8f03542309213 x_refsource_MISC
- https://github.com/xmldom/xmldom/commit/cfb09b5dbeb035fdfedc9f01e2bbaf226bf47cf3 x_refsource_MISC
- https://github.com/xmldom/xmldom/releases/tag/0.8.15 x_refsource_MISC
- https://github.com/xmldom/xmldom/releases/tag/0.9.12 x_refsource_MISC
- https://github.com/xmldom/xmldom/security/advisories/GHSA-27p8-2357-5qqv exploit