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medium · CVSS 6.5

CVE-2026-6732

Libxml2: libxml2: denial of service via crafted xsd-validated document

Published 23 Apr 2026 · Source updated 5 Nov 2026 · Retrieved 2026-11-05 22:56 UTC

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What happened?

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.

Description supplied by CVE Program. Formatting is simplified; follow the original advisory for full details.

Affected software and versions

Source-provided software and version information
SoftwareVersion informationFixed version
libxml2-mainRed Hatunaffected: 2.15.3-0.1.hum1 to < *See vendor advisory
libxml2Red HatDefault status: unaffectedSee vendor advisory
libxml2Red HatDefault status: unaffectedSee vendor advisory
libxml2Red HatDefault status: unaffectedSee vendor advisory
libxml2Red HatDefault status: unaffectedSee vendor advisory
libxml2Red HatDefault status: unaffectedSee vendor advisory
libxml2Red HatDefault status: affectedSee vendor advisory
openshift/ose-rhel-coreos-8Red HatDefault status: unaffectedSee vendor advisory
openshift/ose-rhel-coreos-9Red HatDefault status: unaffectedSee vendor advisory

Version information comes from the source record and can include unaffected products and exceptions. Distribution packages may contain backported fixes: an older upstream version alone does not prove a server is affected.

Is it being exploited?

This CVE was not listed in the CISA catalogue at our last retrieval. This does not establish that exploitation is absent.

CISA data retrieved 2026-11-06 16:38 UTC. Check CISA ↗

How to respond

  1. Confirm the product, installed package version, and any configuration requirements in the vendor advisory.
  2. Follow the vendor’s remediation or workaround guidance in the references below. Structured fixed-version data is unavailable here; the publisher’s description may include a fix or workaround.
  3. Restart affected services if required, then verify the running version. Known exploitation may warrant investigation as well as patching.

Sources and remediation references

This public advisory does not determine whether a particular server is affected. Records are refreshed as sources change; verify urgent decisions against the original advisory.

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