CRITICAL

CVE-2025-49794

CVSS v3

9.1

CRITICAL

EPSS Score

0.8 %

exploit probability, as of 2026-10-16

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

libxml2AlmaLinux:10all versions · fixed in 2.12.5-7.el10_0and 3 other packages
libxml2AlmaLinux:9all versions · fixed in 2.9.13-10.el9_6and 2 other packages
libxml2AlmaLinux:8all versions · fixed in 2.9.7-21.el8_10.1and 2 other packages

Vendor advisories

CVE-2025-49794 Red Hat Product Security582 products fixed · 7 known affected
libxml: Heap use after free (UAF) leads to Denial of service (DoS)
3scale-amp2/system-rhel9 as a component of Red Hat 3scale API Management Platform 2 · 3scale-amp2/zync-rhel9 as a component of Red Hat 3scale API Management Platform 2 · libxml2 as a component of Red Hat Enterprise Linux 6
RHSA-2026:67857 Red Hat Product Security4 products fixed
Red Hat Security Advisory: OpenShift Container Platform 4.15.69 bug fix and security update
RHSA-2026:62549 Red Hat Product Security4 products fixed
Red Hat Security Advisory: OpenShift Container Platform 4.16.70 bug fix and security update
ICSA-26-188-05 CISA1 known affected
Siemens SINEC OS
RUGGEDCOM RST2428P (6GK6242-6PA00)
SSA-253495 Siemens ProductCERT1 known affected
SSA-253495: Multiple Vulnerabilities in SINEC OS before V4.0
RUGGEDCOM RST2428P (6GK6242-6PA00)
ICSA-26-134-16 CISA11 known affected
Siemens Ruggedcom Rox
RUGGEDCOM ROX MX5000 · RUGGEDCOM ROX MX5000RE · RUGGEDCOM ROX RX1400

27 more advisories

Full record on NVD

Description

A use-after-free vulnerability was found in libxml2. This issue occurs when parsing XPath elements under certain circumstances when the XML schematron has the <sch:name path="..."/> schema elements. This flaw allows a malicious actor to craft a malicious XML document used as input for libxml, resulting in the program's crash using libxml or other possible undefined behaviors.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Published: 2025-06-16
Last Modified: 2026-05-12

Frequently asked questions

What is CVE-2025-49794?

Is CVE-2025-49794 actively exploited?

Active exploitation of CVE-2025-49794 has not been confirmed. Its EPSS score was 0.8% on 2026-10-16, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-49794?

CVE-2025-49794 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.

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