Bug 2520814 (CVE-2026-77643)

Summary: CVE-2026-77643 xapian-core: Xapian xapian-core: Arbitrary code execution via incomplete HTML escaping
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: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Xapian xapian-core. This cross-site scripting (XSS) vulnerability is due to incomplete HTML escaping by the Xapian::MSet::snippet() function. A remote attacker could exploit this by injecting malicious script, leading to arbitrary code execution in the user's browser context. This could result in information disclosure or session hijacking.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2521816    
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Description OSIDB Bzimport 2026-08-20 21:49:00 UTC
A cross-site scripting vulnerability in 
queryparser/termgenerator_internal.cc in Xapian xapian-core before 2.1.0 and before 1.4.32 exists due to incomplete HTML escaping by Xapian::MSet::snippet(). NOTE: this issue exists because of a missed corner case of CVE-2018-0499.