CVE-2025-49794 (CVSS 9.1)

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.

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CVSS v3.1 Score

9.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Weakness Type (CWE)

CWE-825 CWE-825

References

Other References

https://access.redhat.com/errata/RHSA-2025:10630 https://access.redhat.com/errata/RHSA-2025:10698 https://access.redhat.com/errata/RHSA-2025:10699 https://access.redhat.com/errata/RHSA-2025:11580 https://access.redhat.com/errata/RHSA-2025:12098 https://access.redhat.com/errata/RHSA-2025:12099 https://access.redhat.com/errata/RHSA-2025:12199 https://access.redhat.com/errata/RHSA-2025:12237 https://access.redhat.com/errata/RHSA-2025:12239 https://access.redhat.com/errata/RHSA-2025:12240

Frequently Asked Questions

What is CVE-2025-49794? +

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. It has a CVSS v3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2025-49794? +

CVE-2025-49794 has a CVSS v3.1 score of 9.1 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

How do I check if I'm vulnerable to CVE-2025-49794? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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