RCE in Tclahr Uac
CVE-2026-40032
UAC (Unix-like Artifacts Collector) before 3.3.0-rc1 contains a command injection vulnerability in the placeholder substitution and command execution pipeline where the _run_command() function passes constructed command strings directly to eval without proper sanitization. Attackers can inject shell metacharacters or command substitutions through attacker-controlled inputs including %line% values from foreach iterators and %user% / %user_home% values derived from system files to achieve arbitrary command execution with the privileges of the UAC process.
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 (66.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 66.7% 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
- Tclahr Uac — versions 0, 3.3.0-rc1
Weakness classification (CWE)
References
- github.com/tclahr/uac/pull/443 (issue-tracking, product)
- github.com/tclahr/uac/commit/cb95d7166cd47908e1189d9669e43f9a6d3d707f (patch)
- github.com/tclahr/uac/commit/50ace60e172e38feb78347bdf579311c23eff078 (patch)
- github.com/tclahr/uac/commit/d0fca5e36d8d6a33a4404f0f6fe92b0424544589 (patch)
- github.com/tclahr/uac/issues/429 (issue-tracking, product)
- mobasi.ai/sentinel (vendor-advisory)
- www.vulncheck.com/advisories/uac-rc1-command-injection-via-placeholder-substitu… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-40032?
- CVE-2026-40032 is a high-severity vulnerability in Tclahr Uac, classified under OS Command Injection. CVSS score: 7.8/10. Published 2026-04-08.
- How severe is CVE-2026-40032?
- High severity. CVSS v3 base score is 7.8 out of 10.