What’s Vulnerable › Vulnerabilities

CVE-2026-40032: UAC < 3.3.0-rc1 Command Injection via Placeholder Substitution

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-08 · updated 2026-07-24
• Weakness: CWE-78

Description

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.

Affected products

• tclahr uac: before 3.3.0-rc1 — fixed in 3.3.0-rc1

How to fix

Upgrade to a fixed version: tclahr uac 3.3.0-rc1. Check the vendor advisory for mitigations.

References

• https://github.com/tclahr/uac/commit/50ace60e172e38feb78347bdf579311c23eff078
• https://github.com/tclahr/uac/commit/cb95d7166cd47908e1189d9669e43f9a6d3d707f
• https://github.com/tclahr/uac/commit/d0fca5e36d8d6a33a4404f0f6fe92b0424544589
• https://github.com/tclahr/uac/issues/429
• https://github.com/tclahr/uac/pull/443
• https://mobasi.ai/sentinel
• https://www.vulncheck.com/advisories/uac-rc1-command-injection-via-placeholder-substitution

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