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Vulnerability record · CVE-2025-34073 · published 2 July 2025

CVE-2025-34073: OS command injection vulnerability

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.

10.0 CVSS 4.0 Critical EPSS 5.6% · top 7.4% CWE-78 · OS command injectionCWE-306 · Missing authentication for critical function Deferred
10.0CVSS 4.0 base score
5.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
17 Jun 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/stamparm/maltrail
https://github.com/stamparm/maltrail/issues/19146
https://huntr.com/bounties/be3c5204-fbd9-448d-b97c-96a8d2941e87
https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/unix/http/maltrail_rce.rb
https://vulncheck.com/advisories/stamparm-maltrail-rce

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Source: NIST National Vulnerability Database (record CVE-2025-34073), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.