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]).
CVE-2026-103431
HIGHPre-NVD 7.77.7—Trending — 4 sources updated this week
EchelonGraph scoreHIGH confidence
Score 7.7 from GitHub Security Advisory (severity: HIGH) published 2026-10-01. A secondary CVSS source baseline 7.7; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
7.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.7Exploit: None knownExposed services: Not assessed
A fix is available — apply it.
- CVSS v3
- 7.7
- EG Score
- 7.7HIGHhigh confidence
- EG Risk
- 39EG Risk 39/100CISA SSVC
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity77% × 45%Exploitation0% × 40%Automatability30% × 15%CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 0.2%
- EPSS %ILE
- 6th
- KEV
- Not listed
CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table
Published
October 1, 2026
Last Modified
October 1, 2026
Advisory Details (2)
Auto-updated Oct 1, 2026Patch available. Sources: redhat.
redhat
2543974 – (CVE-2026-103431) CVE-2026-103431 collectl: collectl: colmux does not sanitize ANSI/VT100 terminal escape sequences in data received from remote collectl instances
https://bugzilla.redhat.com/show_bug.cgi?id=2543974redhat Patch Available
CVE-2026-103431 - Red Hat Customer Portal
Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a
https://access.redhat.com/security/cve/CVE-2026-103431Vendor Advisories for CVE-2026-103431(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(3 across 3 ecosystems)
Debian:12(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| collectl | 4.3.1-1, 4.3.20.1-1, 4.3.20.1-2, 4.3.20.2-1, 4.3.6-2 |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| collectl | 4.3.1-1, 4.3.20.1-1, 4.3.20.1-2, 4.3.20.2-1, 4.3.6-2 |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| collectl | 4.3.1-1, 4.3.20.1-1, 4.3.20.1-2, 4.3.20.2-1, 4.3.6-2 |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 18× in last 7d / 18× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-10-05 09:20 UTCEG score recompute
- 2026-10-05 09:20 UTCGHSA enrichment
- 2026-10-04 23:21 UTCEPSS rescore
- 2026-10-04 20:37 UTCGHSA enrichment
- 2026-10-04 07:55 UTCGHSA enrichment
- 2026-10-03 19:14 UTCEG score recompute
- 2026-10-03 19:14 UTCGHSA enrichment
- 2026-10-03 14:25 UTCEPSS rescore
- 2026-10-03 06:34 UTCGHSA enrichment
- 2026-10-02 17:53 UTCEG score recompute
- 2026-10-02 17:53 UTCGHSA enrichment
- 2026-10-02 05:12 UTCGHSA enrichment
- 2026-10-01 16:30 UTCGHSA enrichment
- 2026-10-01 13:09 UTCEG score recompute
- 2026-10-01 13:09 UTCGHSA enrichment
- 2026-10-01 09:23 UTCEG score recompute
- 2026-10-01 08:51 UTCEG score recompute
- 2026-10-01 08:50 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-103431?
CVE-2026-103431 is a high vulnerability published on October 1, 2026. 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…
When was CVE-2026-103431 disclosed?
CVE-2026-103431 was first published on October 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-103431 actively exploited?
CVE-2026-103431 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-103431?
CVE-2026-103431 has a CVSS base score of 7.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-103431?
A fix for CVE-2026-103431 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-103431 are linked in the Vendor Advisories panel on this page.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-103431
Is Your Infrastructure Affected by CVE-2026-103431?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.