# CVE-2026-83614

## Summary

- **CVE ID:** CVE-2026-83614
- **Severity:** HIGH
- **CVSS Score:** 8.7 (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)
- **CWE:** CWE-400, CWE-407
- **Published:** Sep 1, 2026
- **Last Modified:** Sep 1, 2026

## 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 versions 0.3.0 through 0.6.0, two independent quadratic paths can cause denial of service. In lib/sax.js, parseElementStartPart repeatedly rescans a malformed tag name to the next > during single-character recovery; in lib/dom.js, normalize() repeatedly removes and appends adjacent text nodes, causing quadratic reindexing and string rebuilding. The first path is reachable through default DOMParser.parseFromString() processing, while the second is also reachable through a direct normalize() call on a programmatically constructed DOM, and endDocument invokes that normalization after parsing. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.

## Affected Products

- xmldom — xmldom (>= 0.3.0, <= 0.6.0)
- @xmldom — xmldom (>= 0.7.0, < 0.8.15)
- @xmldom — xmldom (>= 0.9.0, < 0.9.12)

## References

- [CNA](https://github.com/xmldom/xmldom/security/advisories/GHSA-93r5-fhx6-vmg9)
- [CNA](https://github.com/xmldom/xmldom/pull/1071)
- [CNA](https://github.com/xmldom/xmldom/pull/1072)
- [CNA](https://github.com/xmldom/xmldom/commit/0748720b620555f8c222782dcab575cf0cf403b4)
- [CNA](https://github.com/xmldom/xmldom/commit/f40ccb861eee0acbf5ee4feb9a34932e87b329c9)
- [CNA](https://github.com/xmldom/xmldom/releases/tag/0.8.15)
- [CNA](https://github.com/xmldom/xmldom/releases/tag/0.9.12)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.35%
- **EPSS Percentile:** 28.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._