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Fencer Vulns
high 7.5

CVE-2025-49795 json

Libxml: null pointer dereference leads to denial of service (dos)

published 2025-06-16 16 mo ago modified 2026-11-04 4 d ago also EUVD-2025-18416

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

A NULL pointer dereference vulnerability was found in libxml2 when processing XPath XML expressions. This flaw allows an attacker to craft a malicious XML input to libxml2, leading to a denial of service.

Patch / fix

  • GNOME libxml2 2.14.5
  • Red Hat Red Hat Enterprise Linux 10 0:2.12.5-7.el10_0
  • Red Hat Red Hat Hardened Images 2.15.2-0.3.hum1
  • Siemens RUGGEDCOM RST2428P V4.0
  • libxml2 Ubuntu 25.10 2.14.5+dfsg-0.2

ubuntu advisories UBUNTU-CVE-2025-49795

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libxml2 hummingbird 1 2.15.2-0.3.hum1
  • libxml2-16 hummingbird 1 2.15.2-0.3.hum1
  • python3-libxml2 hummingbird 1 2.15.2-0.3.hum1
  • libxml2 RHEL 10.0 2.12.5-7.el10_0
  • python3-libxml2 RHEL 10.0 2.12.5-7.el10_0

red hat advisories RHSA-2026:7519RHSA-2025:10630

  • libxml2 Linux Micro 6.1 2.11.6-slfo.1.1_6.1
  • libxml2 Linux Micro 6.0 2.11.6-10.1
  • libxml2 SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Module for Basesystem 15 SP6 +4 more 2.10.3-150500.5.29.1
  • libxml2-python SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Module for Python 3 15 SP6 +5 more 2.10.3-150500.5.29.1
  • libxml2 SLE Module for Basesystem 15 SP7 2.12.10-150700.4.3.1
  • libxml2-python SLE Module for Python 3 15 SP7, SLE Module for Basesystem 15 SP7 2.12.10-150700.4.3.1

suse advisories SUSE-SU-2025:20607-1SUSE-SU-2025:20564-1SUSE-SU-2025:02314-1SUSE-SU-2025:02260-1

  • libxml2 openSUSE Tumbleweed 2.13.8-2.1

opensuse advisories openSUSE-SU-2025:15321-1

  • libxml2 AlmaLinux 10 2.12.5-7.el10_0
  • python3-libxml2 AlmaLinux 10 2.12.5-7.el10_0

almalinux advisories ALSA-2025:10630

  • libxml2 Rocky Linux 10 2.12.5-7.el10_0

rocky linux advisories RLSA-2025:10630

  • libxml2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 2.13.9-r0

alpine advisories ALPINE-CVE-2025-49795

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libxml2 CBL-Mariner 2.0 2.10.4-9
  • libxml2 Azure Linux 3.0 2.11.5-7

azure linux advisories AZL-64098AZL-64121

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-49795 updated cvss 7.5

libxml: Null pointer dereference leads to Denial of service (DoS)

  • Red Hat Enterprise Linux 6 libxml2, libxml2-python
    affected: workaround, no fix planned “Mitigation is either unavailable or does not meet Red Hat Product Security standards for usability, deployment, applicability, or stability.”
  • Red Hat Enterprise Linux AppStream (v. 10) libxml2-devel 2.12.5-7.el10_0, libxml2-debuginfo 2.12.5-7.el10_0, libxml2-debugsource 2.12.5-7.el10_0, python3-libxml2-debuginfo 2.12.5-7.el10_0 Red Hat Enterprise Linux BaseOS (v. 10) libxml2 2.12.5-7.el10_0, python3-libxml2 2.12.5-7.el10_0 Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libxml2-static 2.12.5-7.el10_0, libxml2-debuginfo 2.12.5-7.el10_0, libxml2-debugsource 2.12.5-7.el10_0, python3-libxml2-debuginfo 2.12.5-7.el10_0
    fixed: vendor fix “Mitigation is either unavailable or does not meet Red Hat Product Security standards for usability, deployment, applicability, or stability.” RHSA-2025:10630
  • Red Hat Hardened Images libxml2 2.15.2-0.3.hum1, libxml2-16 2.15.2-0.3.hum1, python3-libxml2 2.15.2-0.3.hum1
    fixed: vendor fix “Mitigation is either unavailable or does not meet Red Hat Product Security standards for usability, deployment, applicability, or stability.” RHSA-2026:7519
  • Red Hat JBoss Core Services 2.4.62.SP2
    fixed: vendor fix “Mitigation is either unavailable or does not meet Red Hat Product Security standards for usability, deployment, applicability, or stability.” RHSA-2025:19020
  • Red Hat Enterprise Linux 7 libxml2, libxml2-python Red Hat Enterprise Linux 8 libxml2, python3-libxml2 Red Hat Enterprise Linux 9 libxml2, python3-libxml2
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
16 mo ago

Exploit prediction

0.59% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • GNOME libxml2
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat JBoss Core Services 2.4.62.SP2
  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Siemens RUGGEDCOM RST2428P

Classification

Weakness
  • CWE-825 Expired Pointer Dereference

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.