Collectl: collectl: colmux does not sanitize ansi/vt100 terminal escape sequences in data received from remote collectl instances (CVE-2026-103431) | HOL Guard CVE

High · CVSS 7.7CVE-2026-103431

Collectl: collectl: colmux does not sanitize ansi/vt100 terminal escape sequences in data received from remote collectl instances

Answer in brief

CVE-2026-103431 records a High severity (CVSS 7.7) vulnerability in Collectl: collectl: colmux does not sanitize ansi/vt100 terminal escape sequences in data received from remote collectl instances. The current sources do not mark it as known exploited. The current feed maps collectl (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 1, 2026Updated Oct 1, 2026Source checked Oct 1, 2026First seen by HOL Oct 1, 2026Material review Oct 1, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.7
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 7.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps collectl (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
collectlgeneric	>=0 <4.3.20.3	4.3.20.3

Recommended response

Check inventory. Check lockfiles and deployed manifests for collectl.
Review the reported fix. Source-reported workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Evidence timeline and material changes

Published upstream
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 1, 2026

Sources and claim methodology

Upstream source 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]).

Quoted source text, attributed separately from HOL analysis.