What is CVE-2023-39976?

CVE-2023-39976 is a critical-severity vulnerability in Clusterlabs Libqb, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2023-08-08.

How severe is CVE-2023-39976?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2023-39976 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Clusterlabs Libqb

CVE-2023-39976

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

Vulnerability class: Buffer Overflow

EPSS: 0.010 (58.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Clusterlabs Libqb
N/a — versions n/a

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

ghostbyt3/patch-tuesday

References

cve@mitre.org (Patch)
cve@mitre.org (Patch)
cve@mitre.org (Not Applicable)
cve@mitre.org (vendor-advisory)

Frequently asked questions

What is CVE-2023-39976?: CVE-2023-39976 is a critical-severity vulnerability in Clusterlabs Libqb, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2023-08-08.
How severe is CVE-2023-39976?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2023-39976 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.