CVE-2023-39976: Clusterlabs Libqb

Critical severity, CVSS 9.8. EPSS: 1.2% chance of exploitation in the next 30 days.

log_blackbox.c in libqb before 2.0.8 allows a buffer overflow via long log messages because the header size is not considered.

Affected products

• Clusterlabs Libqb: before 2.0.8 (fixed in 2.0.8)

Published 2023-08-08. Last modified 2026-06-17.