https://seclists.org/oss-sec/2026/q2/996: CVE-2026-6653: libxml2: use after fe in xmlParseInternalSubset (>=2.9.11, <2.11.0)

Published Jun 22, 2026
·
Updated

Affected Software

1 affected component
Gnome libxml2>=2.9.11<2.11.0
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Frequently Asked Questions

1

What is the severity of CVE-2026-6653?

The severity of CVE-2026-6653 is classified as medium.

2

Which versions of libxml2 are affected by CVE-2026-6653?

CVE-2026-6653 affects libxml2 versions from 2.9.11 to less than 2.11.0.

3

How do I fix CVE-2026-6653?

To fix CVE-2026-6653, upgrade libxml2 to a version higher than 2.11.0.

4

What causes the vulnerability CVE-2026-6653?

CVE-2026-6653 is caused by a use after free issue in the xmlParseInternalSubset function.

5

Who reported the CVE-2026-6653 vulnerability?

The CVE-2026-6653 vulnerability was reported by Geoffrey Humphreys.

Company

Resources

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https://seclists.org/oss-sec/2026/q2/996 - CVE-2026-6653: libxml2: use after fe in xmlParseInternalSubset (>=2.9.11, <2.11.0) - SecAlerts