Vulnerability · Published Oct 1, 2026 · Assigned by fedora
CVE-2026-103431Collectl: collectl: colmux does not sanitize ansi/vt100 terminal escape sequences in data received from remote collectl instances
High 7.7
In plain English
A high-severity security flaw in collectl. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities).
Severity (CVSS 3.1)7.7High
Exploit odds (30 days)0.2%top 92.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
colmux in collectl before 4.3.20.2 does not sanitize ANSI/VT100 terminal escape sequences in data received from remote collectl instances before displaying it, allowing a local user on a monitored host to inject escape sequences into the terminal of an operator running colmux, via a crafted process name (argv[0]).
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | collectl | no fix listed | DEBIAN-CVE-2026-103431 |
| Debian:13 | collectl | no fix listed | DEBIAN-CVE-2026-103431 |
| Debian:14 | collectl | no fix listed | DEBIAN-CVE-2026-103431 |
| Ubuntu:22.04:LTS | collectl | no fix listed | UBUNTU-CVE-2026-103431 |
| Ubuntu:24.04:LTS | collectl | no fix listed | UBUNTU-CVE-2026-103431 |
| Ubuntu:26.04:LTS | collectl | no fix listed | UBUNTU-CVE-2026-103431 |
| Ubuntu:26.10 | collectl | no fix listed | UBUNTU-CVE-2026-103431 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| collectl | 0 – before 4.3.20.3 |
Weakness: CWE-150 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
References
- https://access.redhat.com/security/cve/CVE-2026-103431 vdb-entry, x_refsource_REDHAT
- RHBZ#2543974 issue-tracking, x_refsource_REDHAT