Medium4.4Red Hat Linux

Medium [CVE-2026-77643] Xapian xapian-core: Arbitrary code execution via incomplete HTML escaping

This medium-severity Red Hat Linux advisory covers CVE-2026-77643 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.

CVE-2026-77643 Published Aug 20, 2026Updated by vendor Aug 20, 2026

CVE-2026-77643

Affected products & platforms

Red Hat LinuxRed Hat Enterprise Linux

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Summary

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.

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.

Red Hat severity: Moderate — CVSS 4.4 (CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N). Weakness: CWE-79.

Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Red Hat does not currently list a fixing RHSA for this CVE.

Affected products named by the advisory: Red Hat package: xapian-core.

Affected versions

< 2.1.0
< 1.4.32

Official advisory · high-confidence parse· fetched 54 minutes ago·verify at source

Fixed versions

No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.

Official advisory · high-confidence parse· fetched 54 minutes ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Official advisory · high-confidence parse· fetched 54 minutes ago·verify at source

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