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Vulnerability · Published Sep 17, 2026 · Assigned by redhat

CVE-2026-76781Libxml2: libxml2: null pointer dereference parsing nextcatalog without catalog attribute

Medium 5.5

In plain English

A medium-severity null pointer dereference in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.2%top 95.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A flaw was found in libxml2. A local user or an attacker providing a specially crafted XML catalog can trigger a NULL pointer dereference during XML catalog parsing. This occurs when a `nextCatalog` element lacks its mandatory `catalog` attribute, leading to the application crashing and causing a Denial of Service (DoS).

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12libxml2no fix listedDEBIAN-CVE-2026-76781
Debian:13libxml2no fix listedDEBIAN-CVE-2026-76781
Debian:14libxml22.15.4+dfsg-1DEBIAN-CVE-2026-76781
Ubuntu:22.04:LTSlibxml22.9.13+dfsg-1ubuntu0.14UBUNTU-CVE-2026-76781
Ubuntu:22.04:LTSlibxml22.9.13+dfsg-1ubuntu0.14USN-8910-1
Ubuntu:24.04:LTSlibxml22.9.14+dfsg-1.3ubuntu3.10USN-8910-1
Ubuntu:24.04:LTSlibxml22.9.14+dfsg-1.3ubuntu3.10UBUNTU-CVE-2026-76781
Ubuntu:26.04:LTSlibxml22.15.2+dfsg-0.1ubuntu0.3USN-8910-1
Ubuntu:26.04:LTSlibxml22.15.2+dfsg-0.1ubuntu0.3UBUNTU-CVE-2026-76781

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Hardened Images see references
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Hardened Images see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 5 see references

Weakness: CWE-476 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References