7.5

CVE-2026-34601: xmldom: XML injection via unsafe CDATA serialization allows attacker-controlled markup insertion

Deferred
AliasesUBUNTU-CVE-2026-34601DEBIAN-CVE-2026-34601CGA-24c4-wxxr-w867
Published 02-04-2026Last modified 15-07-2026

Vulnerability summary

CVE-2026-34601 is a high (CVSS 7.5) XML Injection vulnerability in xmldom. EPSS estimates a 0.49% chance of exploitation in the next 30 days, higher than 42.1% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.49%
0%100%
Low · -0.05 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-5HR8-XVJM-6P6P

Timeline

  1. 02-04-2026
    PublishedVulnerability first disclosed.
  2. 15-07-2026
    Last modifiedVulnerability information updated.

Description

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 metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.49%

Chance of exploitation in the next 30 days

Percentile

42%

Versus all other CVEs

30-day change

Decrease -0.05 pp

From 0.54% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard15 products
  • arangodb-3.11< 3.11.14.3-r5
  • gitlab-rails-ce-18.11< 18.11.6-r7
  • gitlab-rails-ce-19.0< 19.0.5-r21
  • gitlab-rails-ce-19.1< 19.1.3-r2
  • gitlab-rails-ce-19.2< 19.2.4-r1
Opensuse2 products
  • heroic-games-launcher&distro=openSUSE Tumbleweed< 2.20.1-5.1
  • python-jupyterlab-templates&distro=openSUSE Tumbleweed< 0.5.3-1.1
Wolfi2 products
  • saf< 1.6.0-r0
  • sqlpad< 7.5.7-r17
@xmldom1 product
  • xmldom< 0.8.12 | ≥ 0.9.0, < 0.9.9
Debian1 product
  • node-xmldomAll versions (No fix recorded) | < 0.9.9-1
Npm1 product
  • xmldom≤ 0.6.0
Ubuntu1 product
  • node-xmldomAll versions (No fix recorded)
Xmldom1 product
  • xmldomxmldom <= 0.6.0 | @xmldom/xmldom < 0.8.12 | @xmldom/xmldom >= 0.9.0, < 0.9.9

8 vendors · 24 products

References

14 links
Show all 14 references