Bug 2491354 (CVE-2026-6653)

Summary: CVE-2026-6653 libxml2: mingw-libxml2: libxml2: Denial of Service via crafted XML input due to use-after-free
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: adudiak, jmitchel, kaycoth, kshier, pbohmill, rhel-process-autobot, stcannon, teagle, watson-tool-maintainers, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in libxml2. A remote attacker can exploit a use-after-free vulnerability in the `xmlParseInternalSubset` function by providing maliciously crafted XML input. This improper handling of entity resolution can lead to a denial-of-service (DoS), making the affected system or application unavailable.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-06-22 14:02:05 UTC
Use After Free in libxml2's xmlParseInternalSubset from GNOME libxml2 version 2.9.11 to 2.11.0 allows a remote attacker to cause a denial-of-service via maliciously crafted XML input with improper entity resolution handling.