What’s Vulnerable › Vulnerabilities

CVE-2023-39976

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-08-08 · updated 2026-06-17
• Weakness: CWE-120

Description

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

How to fix

Upgrade to a fixed version: ClusterLabs Libqb 2.0.8. Check the vendor advisory for mitigations.

References

• https://github.com/ClusterLabs/libqb/commit/1bbaa929b77113532785c408dd1b41cd0521ffc8
• https://github.com/ClusterLabs/libqb/compare/v2.0.7...v2.0.8
• https://github.com/ClusterLabs/libqb/pull/490
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KECNF7LFBPE57XSBT6EM7ACVMIBP63WH/
• https://github.com/ClusterLabs/libqb/commit/1bbaa929b77113532785c408dd1b41cd0521ffc8
• https://github.com/ClusterLabs/libqb/compare/v2.0.7...v2.0.8
• https://github.com/ClusterLabs/libqb/pull/490
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KECNF7LFBPE57XSBT6EM7ACVMIBP63WH/

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