CVE-2025-49794

Libxml: heap use after free (uaf) leads to denial of service (dos)

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.

Remediation

Workaround:

  • There's no available mitigation other than avoid processing untrusted XML documents before updating to the libxml version containing the fix.

Category

9.1
CVSS
Severity: Critical
CVSS 3.1 •
EPSS 0.05%
Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com
Affected: Red Hat Red Hat Enterprise Linux 10
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 9
Affected: Red Hat Red Hat Enterprise Linux 9
Affected: Red Hat Red Hat Enterprise Linux 6
Affected: Red Hat Red Hat Enterprise Linux 7
Affected: Red Hat Red Hat JBoss Core Services
Published at:
Updated at:

References

Link Tags
https://access.redhat.com/errata/RHSA-2025:10630 vendor advisory
https://access.redhat.com/errata/RHSA-2025:10698 vendor advisory
https://access.redhat.com/errata/RHSA-2025:10699 vendor advisory
https://access.redhat.com/security/cve/CVE-2025-49794 vdb entry
https://bugzilla.redhat.com/show_bug.cgi?id=2372373 issue tracking

Frequently Asked Questions

What is the severity of CVE-2025-49794?
CVE-2025-49794 has been scored as a critical severity vulnerability.
How to fix CVE-2025-49794?
As a workaround for remediating CVE-2025-49794: There's no available mitigation other than avoid processing untrusted XML documents before updating to the libxml version containing the fix.
Is CVE-2025-49794 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-49794 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-49794?
CVE-2025-49794 affects Red Hat Red Hat Enterprise Linux 10, Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 9, Red Hat Red Hat Enterprise Linux 9, Red Hat Red Hat Enterprise Linux 6, Red Hat Red Hat Enterprise Linux 7, Red Hat Red Hat JBoss Core Services.
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