CVE-2026-41873 — CRITICAL (9.8)

Vulnerability Description

** UNSUPPORTED WHEN ASSIGNED ** Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Pony Mail leading to admin account takeover. This issue affects all versions of the Lua implementation of Pony Mail. There is a Python implementation under development under the name "Pony Mail Foal" that is not affected by this issue, but hasn't been released yet. As the Lua implementation of this project is retired, we do not plan to release a version that fixes this issue. Users are recommended to find an alternative or restrict access to the instance to trusted users. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

CVSS Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Apache	Pony Mail	All versions

Related Weaknesses (CWE)

CWE-444

References

https://lists.apache.org/thread/1c7jtxjobh280kqc13fzw1cg57xrz951Mailing ListVendor Advisory
http://www.openwall.com/lists/oss-security/2026/04/28/17

FAQ

What is CVE-2026-41873?

CVE-2026-41873 is a vulnerability with a CVSS score of 9.8 (CRITICAL). ** UNSUPPORTED WHEN ASSIGNED ** Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Pony Mail leading to admin account takeover. This issue affects all v...

How severe is CVE-2026-41873?

CVE-2026-41873 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-41873?

Check the references section above for vendor advisories and patch information. Affected products include: Apache Pony Mail.