Critical [CVE-2025-49794] heap use after free (uaf) leads to denial of service (dos)
This critical-severity Red Hat Linux advisory covers CVE-2025-49794 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7 Extended Lifecycle Support, Red Hat Enterprise Linux 8.2 Advanced Update Support.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published
Summary
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 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.
This issue was rated with a severity impact of Important by Red Hat Product Security, as libxml can be used to parse XML coming from the network depending on how the program consumes it and uses the library.
Additionally, although the initial report shows a crash due to invalid memory access (A:H), other undefined issues that can present data integrity due to the application overwriting sensitive data are not discarded (I:H). Weakness: CWE-825.
Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8.2 Advanced Update Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; and 29 more.
Affected products named by the advisory: Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.6 Telecommunications Update Service; Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions; and 25 more.
Is CVE-2025-49794 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2025-49794 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2025-49794?
Upgrade to a fixed release named by Red Hat:
- libxml2-0:2.12.5-7.el10_0
- libxml2-0:2.9.1-6.el7_9.10
- libxml2-0:2.9.7-21.el8_10.1
- libxml2-0:2.9.7-9.el8_2.3
- libxml2-0:2.9.7-9.el8_4.6
- libxml2-0:2.9.7-13.el8_6.10
- libxml2-0:2.9.7-16.el8_8.9
- libxml2-0:2.9.13-10.el9_6
- libxml2-0:2.9.13-1.el9_0.5
- libxml2-0:2.9.13-3.el9_2.7
- libxml2-0:2.9.13-10.el9_4
- libxml2
38 more fixed releases are listed below.
Confirm against the vendor advisory before you patch.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 17 days ago·verify at source
- libxml2-0:2.12.5-7.el10_0
- libxml2-0:2.9.1-6.el7_9.10
- libxml2-0:2.9.7-21.el8_10.1
- libxml2-0:2.9.7-9.el8_2.3
- libxml2-0:2.9.7-9.el8_4.6
- libxml2-0:2.9.7-13.el8_6.10
- libxml2-0:2.9.7-16.el8_8.9
- libxml2-0:2.9.13-10.el9_6
- libxml2-0:2.9.13-1.el9_0.5
- libxml2-0:2.9.13-3.el9_2.7
- libxml2-0:2.9.13-10.el9_4
- libxml2
- openshift/ose-rhel-coreos-8:412.86.202510291903-0
- openshift/ose-rhel-coreos-9:413.92.202510150118-0
- openshift/ose-rhel-coreos-9:414.92.202510211419-0
- openshift/ose-rhel-coreos-9:415.92.202609140326-0
- openshift/ose-rhel-coreos-9:416.94.202609011112-0
- openshift/ose-rhel-coreos-9:417.94.202510112152-0
- openshift/ose-rhel-coreos-9:418.94.202510230424-0
- openshift/ose-rhel-coreos-9:4.19.9.6.202510140714-0
- openshift/ose-rhel-coreos-9:4.20.9.6.202509251656-0
- web-terminal/web-terminal-rhel9-operator:1.11-19
- web-terminal/web-terminal-tooling-rhel9:1.11-8
- web-terminal/web-terminal-tooling-rhel9:1.12-4
- openshift-serverless-1/logic-data-index-ephemeral-rhel8:1.36.0-11
- openshift-serverless-1/logic-data-index-postgresql-rhel8:1.36.0-11
- openshift-serverless-1/logic-db-migrator-tool-rhel8:1.36.0-11
- openshift-serverless-1/logic-jobs-service-ephemeral-rhel8:1.36.0-10
- openshift-serverless-1/logic-jobs-service-postgresql-rhel8:1.36.0-10
- openshift-serverless-1/logic-kn-workflow-cli-artifacts-rhel8:1.36.0-4
- openshift-serverless-1/logic-management-console-rhel8:1.36.0-9
- openshift-serverless-1/logic-operator-bundle:1.36.0-12
- openshift-serverless-1/logic-rhel8-operator:1.36.0-18
- openshift-serverless-1/logic-swf-builder-rhel8:1.36.0-11
- openshift-serverless-1/logic-swf-devmode-rhel8:1.36.0-7
- cert-manager/jetstack-cert-manager-rhel9:v1.16.5-1760515757
- compliance/openshift-file-integrity-rhel8-operator:v1.3
- libxml2-main-2.15.2-0.3.hum1
- insights-proxy/insights-proxy-container-rhel9:1.5.5-1754504343
- RHSA-2025:10630
- RHSA-2025:12240
- RHSA-2025:10698
- RHSA-2025:12237
- RHSA-2025:12241
- RHSA-2025:12098
- RHSA-2025:12239
- RHSA-2025:10699
- RHSA-2025:12099
- RHSA-2025:12199
- RHSA-2025:11580
Official advisory · high-confidence parse· fetched 17 days ago·verify at source
Mitigation checklist
- There's no available mitigation other than avoid processing untrusted XML documents before updating to the libxml version containing the fix.
Official advisory · high-confidence parse· fetched 17 days ago·verify at source
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