alseambusher crontab-ui - Unauthenticated RCE via Newline Injection in env_vars Parameter (CVE-2026-72590) | HOL Guard CVE

Critical · CVSS 9.8CVE-2026-72590

alseambusher crontab-ui - Unauthenticated RCE via Newline Injection in env_vars Parameter

Answer in brief

CVE-2026-72590 records a Critical severity (CVSS 9.8) vulnerability in alseambusher crontab-ui - Unauthenticated RCE via Newline Injection in env_vars Parameter. The current sources do not mark it as known exploited. The current feed maps alseambusher/crontab-ui (generic), alseambusher/crontab-ui (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 Aug 10, 2026Updated Aug 28, 2026Source checked Sep 24, 2026First seen by HOL Aug 10, 2026Material review Aug 28, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.8
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 9.8. 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 alseambusher/crontab-ui (generic), alseambusher/crontab-ui (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
alseambusher/crontab-uigeneric	>=0 <0.4.2	0.4.2
alseambusher/crontab-uigeneric	0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for alseambusher/crontab-ui, alseambusher/crontab-ui.
Review the reported fix. Update alseambusher/crontab-ui to 0.4.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 10, 2026

Sources and claim methodology

Upstream source description

An OS command injection vulnerability in alseambusher/crontab-ui through 0.4.2 allows an unauthenticated remote attacker to inject arbitrary cron job entries by sending a crafted GET request to /crontab with URL-encoded newlines in the env_vars parameter.

Quoted source text, attributed separately from HOL analysis.