Null Pointer Dereference Vulnerability in libxml2
CVE-2026-76781

5.5MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
17 September 2026

What is CVE-2026-76781?

A flaw in libxml2 allows a local user or attacker to exploit a specially crafted XML catalog. The vulnerability arises when a nextCatalog element omits its necessary catalog attribute, resulting in a NULL pointer dereference during XML catalog parsing. This exploitation can lead to application crashes and may result in a Denial of Service (DoS). It's crucial for users of libxml2 to update their systems to mitigate this risk.

References

https://access.redhat.com/security/cve/CVE-2026-76781
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2519776
issue-trackingx_refsource_REDHAT
https://gitlab.gnome.org/GNOME/libxml2/-/commit/c6324894

CVSS V3.1

Score:
5.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Yirou Yang for reporting this issue.
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