USN-8428-1

It was discovered that tmux incorrectly handled image cleanup, leading to a use-after-free vulnerability. A local attacker could possibly use this issue to cause tmux to crash, resulting in a denial of service.

References

Affected packages

Ubuntu:26.04:LTS / tmux

Package

Name: tmux
Purl: pkg:deb/ubuntu/tmux?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

3.6a-2ubuntu0.1

Affected versions

3.*

3.5a-3build1

3.6a-1

3.6a-2

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "3.6a-2ubuntu0.1",
            "binary_name": "tmux"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8428-1.json"

cves_map

{
    "cves": [
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P",
                    "type": "CVSS_V4"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2026-11623"
        }
    ],
    "ecosystem": "Ubuntu:26.04:LTS"
}