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

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.

Published: 2026-04-02 Last update: 2026-04-16 Assigner: [email protected] Source: [email protected]
NVD Status：Deferred，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-34601 is rated Low Risk (31.9/100): CVSS High severity, with low exploitation likelihood (EPSS 0.02%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-34601

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-22 0.05% 0.02% -0.03%
2 2026-04-08 0.04% 0.05% +0.01%
3 2026-04-03 — 0.04% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-34601

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2026-34601

GitHub Security Advisory for CVE-2026-34601

GHSA-wh4c-j3r5-mjhp · Severity: high · Ecosystem: npm — xmldom: XML injection via unsafe CDATA serialization allows attacker-controlled markup insertion

OS Trackers for CVE-2026-34601

vendor priority summary link
debian not yet assigned CVE-2026-34601 not yet assigned priority: Debian including 1 source packages (node-xmldom), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 3, resolved 2. https://security-tracker.debian.org/tracker/CVE-2026-34601
redhat high — https://access.redhat.com/security/cve/CVE-2026-34601
suse high CVE-2026-34601 severity important: SUSE including 8 source package names (heroic-games-launcher-2.20.1-5.1, jupyter-jupyterlab-templates-0.5.3-1.1, …), 11 product×package rows across 3 product lines (SUSE Linux Enterprise Server 15 SP1-LTSS, SUSE Linux Enterprise Server 15 SP2-LTSS, openSUSE Tumbleweed): Known Not Affected 6, Fixed 5. https://www.suse.com/security/cve/CVE-2026-34601/
ubuntu medium CVE-2026-34601 medium priority: Ubuntu including 1 source packages (node-xmldom), 5 status rows across 5 suites (focal, jammy, noble, questing, upstream): needs-triage 5. https://ubuntu.com/security/CVE-2026-34601

Affected software / configurations for CVE-2026-34601

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2026-34601

cvelogic Threat Intelligence