RCE in Tclahr Uac
CVE-2026-41451
UAC (Unix-like Artifacts Collector) versions prior to 3.3.0 contain a command injection vulnerability in the user substitution logic within parse_artifact.sh where usernames and home directories from /etc/passwd are substituted directly into command strings without escaping before execution via eval. Attackers can inject shell metacharacters such as command substitution syntax or semicolons through crafted usernames or home directory paths in /etc/passwd entries to execute arbitrary commands on the analyst's host system.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.012 (66.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.012 · change: +0.005
Affected products
Weakness classification (CWE)
References
- github.com/tclahr/uac/pull/443 (issue-tracking)
- github.com/tclahr/uac/commit/2cc367d8ead388f05abd3cfb8af537788a124e72 (patch)
- www.vulncheck.com/advisories/uac-command-injection-via-user-substitution-in-par… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-41451?
- CVE-2026-41451 is a high-severity vulnerability in Tclahr Uac, classified under OS Command Injection. CVSS score: 7.8/10. Published 2026-08-21.
- How severe is CVE-2026-41451?
- High severity. CVSS v3 base score is 7.8 out of 10.