---
cve: "CVE-2026-34601"
severity: "HIGH"
cvss: 7.5
epss: "0.5%"
vendor: "xmldom"
kev: false
exploited: false
published: "2026-04-02 17:47:13"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T21:47:09+02:00"
---

# CVE-2026-34601

> 7.5 HIGH · 🧪 PoC

## Beschreibung

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) `DOMParser` and `XMLSerializer` module. In xmldom versions 0.6.0 and prior and @xmldom/xmldom prior to versions 0.8.12 and 0.9.9, xmldom/xmldom allows attacker-controlled strings containing the CDATA terminator ]]> to be inserted into a CDATASection node. During serialization, XMLSerializer emitted the CDATA content verbatim without rejecting or safely splitting the terminator. As a result, data intended to remain text-only became active XML markup in the serialized output, enabling XML structure injection and downstream business-logic manipulation. This issue has been patched in xmldom version 0.6.0 and @xmldom/xmldom versions 0.8.12 and 0.9.9.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- 2b852e836ab86dbbd6cbaf0537f584dd0b5ac184 (Commit)
- 189cb78a83e81e1515880988a399e863a8be85ac (Commit)

## Referenzen

- <https://github.com/xmldom/xmldom/security/advisories/GHSA-wh4c-j3r5-mjhp>
- <https://github.com/xmldom/xmldom/commit/2b852e836ab86dbbd6cbaf0537f584dd0b5ac184>
- <https://github.com/xmldom/xmldom/releases/tag/0.8.12>
- <https://github.com/xmldom/xmldom/releases/tag/0.9.9>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-34601) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_