CVE catalog
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
- Severity
- Medium · CVSS 5.8
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.12% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | tmux | sid | 3.8-1 | fixed |
| Debian | tmux | forky | 3.7c-1 | fixed |
| Debian | tmux | trixie | 3.5a-3 | not affected |
| Debian | tmux | bookworm | 3.3a-3 | not affected |
| Cpe | tmux | Not reported | Not reported | not affected |
| Ubuntu | tmux | 26.04 | 3.5a-3build1 | vulnerable |
| Ubuntu | tmux | 26.04 | 3.6a-1 | vulnerable |
| Ubuntu | tmux | 26.04 | 3.6a-2 | vulnerable |
| Ubuntu | tmux | 26.04 | 3.6a-2ubuntu0.1 | fixed |
| Ubuntu | tmux | 26.04 | 3.5a-3build1 | vulnerable |
| Ubuntu | tmux | 26.04 | 3.6a-1 | vulnerable |
| Ubuntu | tmux | 26.04 | 3.6a-2 | vulnerable |
| Ubuntu | tmux | 26.04 | 3.6a-2ubuntu0.1 | fixed |
| Opensuse | tmux | tumbleweed | 3.6b-2.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | tmux | source | sid | 3.6b-1 | not yet assigned | Not reported | [1140487] |
| Debian | tmux | source | forky | 3.6b-1 | not yet assigned | Not reported | [1140487] |
| Debian | tmux | source | trixie | Not affected | unimportant | Not reported | [1140487] |
| Debian | tmux | source | bookworm | Not affected | unimportant | Not reported | [1140487] |
| Ubuntu | tmux | deb | 26.04 | 3.6a-2ubuntu0.1 | Not reported | USN-8428-1 | Not reported |
| Ubuntu | tmux | deb | 26.04 | 3.6a-2ubuntu0.1 | Not reported | UBUNTU-CVE-2026-11623 | Not reported |
| Opensuse | tmux | rpm | tumbleweed | 3.6b-2.1 | Not reported | OPENSUSE-SU-2026:11006-1 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [tmux]Not affected
Details (4)
3.3a-3· amd64 · bookwormNot affected
nvd · tmux · debian · bookworm
3.3a-3· arm64 · bookwormNot affected
nvd · tmux · debian · bookworm
3.5a-2~bpo12+1· amd64 · bookworm-backportsNot affected
nvd · tmux · debian · bookworm
3.5a-2~bpo12+1· arm64 · bookworm-backportsNot affected
nvd · tmux · debian · bookworm
[openSUSE Tumbleweed]
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11006-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-11623]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-11623]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-11623]
- [https://osv.dev/vulnerability/USN-8428-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:11006-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-11623]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-11623.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]