Bug 2561440 (CVE-2026-116740)

Summary: CVE-2026-116740 libcss: libcss: Denial of Service via media list trailing comma
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in libcss. A remote attacker could cause a Denial of Service (DoS) by convincing an application or user to parse a specially crafted stylesheet. When the library processes a media query list ending with a trailing comma, an unhandled null pointer dereference occurs, causing the application to crash.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-10-26 22:32:25 UTC
libcss through 0.9.2 contains a NULL pointer dereference vulnerability in mq_parse_media_query() that allows remote attackers to crash consumers by supplying media lists ending in a comma. Attackers can serve a stylesheet whose @media or @import media list has a trailing comma, causing NetSurf or other parsers to crash.