---
cve: "CVE-2026-83617"
severity: "HIGH"
cvss: 8.7
epss: "33%"
vendor: "xmldom"
kev: false
exploited: false
published: "2026-09-01 15:17:40"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-18T05:11:27+02:00"
---

# CVE-2026-83617

> 8.7 HIGH · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 7b2ec67e1750daadd0bb06c92e875e726544a362 (Commit)
- 0af8cf829d8a92bbac612903422c6947f5458f06 (Commit)

## Referenzen

- <https://github.com/xmldom/xmldom/security/advisories/GHSA-jxjr-3g7g-3944>
- <https://github.com/xmldom/xmldom/pull/1071>
- <https://github.com/xmldom/xmldom/commit/7b2ec67e1750daadd0bb06c92e875e726544a362>
- <https://github.com/xmldom/xmldom/releases/tag/0.9.12>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-83617) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_