CVE-2026-41673 xmldom: Denial of service via uncontrolled recursion in XML serialization
Attackers can crash applications using xmldom by providing deeply nested XML, causing stack overflow via uncontrolled recursion.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-41673?
CVE-2026-41673 is a high-severity denial of service vulnerability in xmldom, published on 7 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) `DOMParser` and `XMLSerializer` module. In @xmldom/xmldom prior to versions 0.9.10 and 0.8.13 and xmldom version 0.6.0 and prior, seven recursive traversals in lib/dom.js operate without a depth limit. A sufficiently deeply nested DOM tree causes a RangeError: Maximum call stack size exceeded, crashing the application. This issue has been patched in versions @xmldom/xmldom versions 0.9.10 and 0.8.13.
Which versions are affected by CVE-2026-41673?
6 open source packages ship an affected version, including @xmldom/xmldom and xmldom.
| Package | Affected | Fixed in |
|---|---|---|
@xmldom/xmldom npm | All versions | 0.8.13 |
@xmldom/xmldom npm | All versions | 0.8.13 |
@xmldom/xmldom npm | From 0.9.0 | 0.9.10 |
@xmldom/xmldom npm | From 0.9.0 | 0.9.10 |
xmldom npm | All versions to 0.6.0 | None |
xmldom npm | All versions to 0.6.0 | None |
How do I fix CVE-2026-41673?
Upgrade @xmldom/xmldom to a fixed version for your release line: 0.8.13 or 0.9.10.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-41673 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41673 exists.
Sources
Also known as CLEANSTART-2026-NZ44243, CLEANSTART-2026-WO11970, DEBIAN-CVE-2026-41673, ECHO-822c-f1d2-8fbf, GHSA-2v35-w6hq-6mfw, MINI-4rhf-2434-9rp7 and 5 more.