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CVE-2026-11623: tmux image.c image_free use after free

mediumCVSS 4.5CVE-2026-11623

CSIRTS triage

vendor: tmuxproduct: tmuxOther
What
This vulnerability is a use-after-free issue in image.c image_free.
Who is affected
Users of tmux are affected by this vulnerability.
Urgency
Remediation is necessary due to a medium severity rating.
Action
Update to the latest version of tmux to resolve this issue.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 4.5
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-11623

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-11623coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

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