stamparm maltrail Blacklist Endpoint httpd.py _blacklist missing authentication
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-287.
Summary
A weakness has been identified in stamparm maltrail up to 3.0.1. This vulnerability affects the function _blacklist of the file core/httpd.py of the component Blacklist Endpoint. Executing a manipulation can lead to missing authentication. The attack can be launched remotely. The exploit has been made available to the public and could be used for attacks. Upgrading to version 3.1 is able to resolve this issue. This patch is called d95868dff3da4d3bd4f942837a26cb7c73a797ae. It is suggested to upgrade the affected component. The vendor fixed the issue the same day it was reported, in version 3.1, by gating the endpoint on an authenticated session or the new Blacklist_ALLOWLIST option.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
- Fix · CNA maltrail (stamparm) Fixed in 3.1
Timeline
- 2026-10-02 Threatist record created from CVE-2026-91002
- 2026-10-03 Alias added: GHSA-j5qh-4734-fxc3
References
More Stamparm vulnerabilities
- TI-2025-24241 stamparm/maltrail <=0.54 Remote Command Execution CVSS 4.0CRITICAL 10.0
Sources
- CVE-2026-91002 · CVE Program
- CVE-2026-91002 · NVD
- FIRST EPSS
- GHSA-j5qh-4734-fxc3 · GitHub Advisory Database · CC BY 4.0
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