CVE-2026-77643

Severity: medium (CVSS 4.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-20 · updated 2026-10-18
Weakness: CWE-79

Description

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.

Affected products

xapian-core: from 2.0.0 before 2.1.0; before 1.4.32 — fixed in 1.4.32, 2.1.0

How to fix

Upgrade to a fixed version: xapian-core 1.4.32, 2.1.0. Check the vendor advisory for mitigations.

References

https://bugs.debian.org/1144490
https://lists.xapian.org/pipermail/xapian-devel/2026-August/003429.html
https://trac.xapian.org/wiki/SecurityFixes/2018-07-02#a2026-08-13update

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