Vulnerability · Published Aug 20, 2026 · Assigned by mitre
CVE-2026-77643
Medium 4.4
In plain English
A medium-severity cross-site scripting in xapian-core from Xapian. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)4.4Medium
Exploit odds (30 days)0.3%top 83.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | xapian-core | no fix listed | DEBIAN-CVE-2026-77643 |
| Debian:13 | xapian-core | 1.4.29-3+deb13u1 | DEBIAN-CVE-2026-77643 |
| Debian:14 | xapian-core | 1.4.32-1 | DEBIAN-CVE-2026-77643 |
| Ubuntu:22.04:LTS | xapian-core | no fix listed | UBUNTU-CVE-2026-77643 |
| Ubuntu:24.04:LTS | xapian-core | no fix listed | UBUNTU-CVE-2026-77643 |
| Ubuntu:26.04:LTS | xapian-core | no fix listed | UBUNTU-CVE-2026-77643 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Xapian | xapian-core | 2.0.0 – before 2.1.00 – before 1.4.32 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N