Is CVE-2026-11623 in the CISA KEV catalog?

No. CVE-2026-11623 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-11623?

CVE-2026-11623 has a CVSS v3 base score of 4.5 (Low).

What is the EPSS score for CVE-2026-11623?

CVE-2026-11623 has an EPSS score of 0.12% (3th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-11623?

Upgrade tmux on debian unstable to 3.6b-1 or later.

CVE & CISA-KEV Catalog

CVE-2026-11623

LOW

4.5

CVSS v3

NVD

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.

CWE-119Buffer Overflow CWE-416Use After Free

How to fix

Remediation Available

tmuxDebian

Fixed in:3.6b-1CVE-2026-11623

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityLow

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C

Exploit Intelligence

0.12%probability of exploitation in 30 days

3rdpercentile

Low risk: more likely to be exploited than 3% of all known CVEs.

References

Other references8

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-09.