Bug 2567801 (CVE-2026-123202)

Summary: CVE-2026-123202 libnxml: libnxml: Denial of Service via stack-based buffer overflow
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in libnxml. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by crashing applications that process untrusted data. By supplying specially crafted XML or RSS feeds containing excessively long names ending in multi-byte characters, an attacker can trigger a stack-based buffer overflow in the parser component, leading to an application crash.
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Description OSIDB Bzimport 2026-11-05 22:27:06 UTC 
libnxml before 0.18.6 contains a stack-based buffer overflow vulnerability in src/nxml_parser.c that allows remote attackers to write past a 1024-byte stack buffer via long XML names. Attackers can supply XML or RSS feeds with a 1022-character element, attribute, DOCTYPE or entity name ending in a multi-byte UTF-8 character to crash parsing applications.