CVE-2026-11623

MEDIUM

tmux image.c image_free use after free

Title source: cna
STIX 2.1

Description

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 characterized by high complexity. The exploitability is told to be difficult. The exploit has been disclosed publicly and may be used. Upgrading to version 3.7-rc is able to address this issue. The name of the patch is fc6d94a9f8a593bd8b7031650802084385d4ee03. The affected component should be upgraded.

References (8)

Core 8
Core References
Vdb Entry, Technical Description vdb-entry technical-description
VDB-369303 | tmux image.c image_free use after free
https://vuldb.com/vuln/369303
Signature, Permissions Required signature permissions-required
VDB-369303 | CTI Indicators (IOB, IOC, IOA)
https://vuldb.com/vuln/369303/cti
Third Party Advisory third-party-advisory
CVE-2026-11623 | CVE Analysis and Report
https://vuldb.com/cve/CVE-2026-11623
Third Party Advisory third-party-advisory
Submit #835623 | tmux <= 3.6a Use After Free
https://vuldb.com/submit/835623

Scores

CVSS v3 4.5
EPSS 0.0011
EPSS Percentile 1.7%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-119 CWE-416
Status published
Products (2)
None/tmux 3.6a
None/tmux 3.7-rc
Published Jun 09, 2026
Tracked Since Jun 09, 2026