Buffer overflow in Tmux
CVE-2026-11623
A security vulnerability has been detected in tmux up to 3.6a. Affected is the function image_free of the file image.c. Such manipulation leads to use after free. Local access is required to approach this attack. This attack is characteriz…
Vulnerability class: Buffer Overflow
EPSS: 0.001 (2.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.5 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L.
Affected products
- N/a Tmux — versions 3.6a, 3.7-rc
Weakness classification (CWE)
References
- cna@vuldb.com (exploit)
- cna@vuldb.com (product)
- cna@vuldb.com (patch)
- cna@vuldb.com (patch)
- cna@vuldb.com (third-party-advisory)
- cna@vuldb.com (third-party-advisory)
- cna@vuldb.com (technical-description, vdb-entry)
- cna@vuldb.com (signature, permissions-required)
Frequently asked questions
- What is CVE-2026-11623?
- CVE-2026-11623 is a medium-severity vulnerability in Tmux, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 4.5/10. Published 2026-06-09.
- How severe is CVE-2026-11623?
- Medium severity. CVSS v3 base score is 4.5 out of 10.