NULL pointer dereference in expat - CVE-2026-24515

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Main Vulnerability Database Vulnerabilities #VU122267

NULL pointer dereference in expat - CVE-2026-24515

Published: February 3, 2026


Vulnerability identifier: #VU122267
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-24515
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in XML_ExternalEntityParserCreate. A remote attacker can pass specially crafted XML data to the application and perform a denial of service (DoS) attack.


Affected software

expat
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
OpenBSD
Ubuntu
Basesystem Module
openSUSE Leap
openEuler
Anolis OS
Fedora
LANTIME Operating System Firmware (LTOS)
Tenable Nessus
libxmltok (Ubuntu package)
expat (Ubuntu package)
expat
expat-debuginfo
expat-debugsource
expat-devel
expat-help
expat-static
expat-doc
expat-debuginfo-32bit
libexpat1-debuginfo-32bit
libexpat1
libexpat-devel
libexpat1-debuginfo
libexpat1-32bit
expat-64bit-debuginfo
libexpat-devel-32bit
expat-32bit-debuginfo
libexpat1-32bit-debuginfo
libexpat1-64bit-debuginfo
libexpat-devel-64bit
libexpat1-64bit
mingw-expat
Encryption Admin Utilities

How to mitigate CVE-2026-24515

Install updates from vendor's website.

expat - update to 2.7.4
LANTIME Operating System Firmware (LTOS) - update to 7.10.009
Tenable Nessus - addressed in versions 10.10.2, 10.11.2
libxmltok (Ubuntu package) - addressed in versions 1.2-3ubuntu0.16.04.1~esm5, 1.2-4ubuntu0.18.04.1~esm6, 1.2-4ubuntu0.20.04.1~esm6, 1.2-4ubuntu0.22.04.1~esm6, 1.2-4.1ubuntu2.24.0.4.1+esm4
expat (Ubuntu package) - addressed in versions 2.1.0-4ubuntu1.4+esm11, 2.1.0-7ubuntu0.16.04.5+esm11, 2.2.5-3ubuntu0.9+esm3, 2.2.9-1ubuntu0.8+esm1, 2.4.7-1ubuntu0.7, 2.6.1-2ubuntu0.4, 2.7.1-2ubuntu0.2
expat - addressed in versions 2.2.9-20, 2.4.1-21, 2.5.0-14, 2.5.0-15
expat-debuginfo - addressed in versions 2.2.9-20, 2.4.1-21, 2.5.0-14, 2.5.0-15
expat-debugsource - addressed in versions 2.2.9-20, 2.4.1-21, 2.5.0-14, 2.5.0-15
expat-devel - addressed in versions 2.2.9-20, 2.4.1-21, 2.5.0-14, 2.5.0-15
expat-help - addressed in versions 2.2.9-20, 2.4.1-21, 2.5.0-14, 2.5.0-15
expat - update to 2.5.0-9
expat-devel - update to 2.5.0-9
expat-static - update to 2.5.0-9
expat-doc - update to 2.5.0-9
expat-debuginfo-32bit - update to 2.7.1-21.49.1
libexpat1-debuginfo-32bit - update to 2.7.1-21.49.1
expat-debugsource - addressed in versions 2.7.1-21.49.1, 2.7.1-150000.3.42.1, 2.7.1-150400.3.34.1, 2.7.1-150700.3.9.2
libexpat1 - addressed in versions 2.7.1-21.49.1, 2.7.1-150000.3.42.1, 2.7.1-150400.3.34.1, 2.7.1-150700.3.9.2
expat-debuginfo - addressed in versions 2.7.1-21.49.1, 2.7.1-150000.3.42.1, 2.7.1-150400.3.34.1, 2.7.1-150700.3.9.2
libexpat-devel - addressed in versions 2.7.1-21.49.1, 2.7.1-150400.3.34.1, 2.7.1-150700.3.9.2
expat - addressed in versions 2.7.1-21.49.1, 2.7.1-150400.3.34.1, 2.7.1-150700.3.9.2
libexpat1-debuginfo - addressed in versions 2.7.1-21.49.1, 2.7.1-150000.3.42.1, 2.7.1-150400.3.34.1, 2.7.1-150700.3.9.2
libexpat1-32bit - addressed in versions 2.7.1-21.49.1, 2.7.1-150400.3.34.1, 2.7.1-150700.3.9.2
expat-64bit-debuginfo - update to 2.7.1-150400.3.34.1
libexpat-devel-32bit - update to 2.7.1-150400.3.34.1
expat-32bit-debuginfo - addressed in versions 2.7.1-150400.3.34.1, 2.7.1-150700.3.9.2
libexpat1-32bit-debuginfo - addressed in versions 2.7.1-150400.3.34.1, 2.7.1-150700.3.9.2
libexpat1-64bit-debuginfo - update to 2.7.1-150400.3.34.1
libexpat-devel-64bit - update to 2.7.1-150400.3.34.1
libexpat1-64bit - update to 2.7.1-150400.3.34.1
mingw-expat - addressed in versions 2.7.4-1.fc42, 2.7.4-1.fc43
Encryption Admin Utilities - update to 11.13.1

External References

Related Security Bulletins