CVE-2026-41873: UNSUPPORTED WHEN ASSIGNED Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling

This month

CRITICAL 9.8REMOTEWATCHLISTMITIGATE

CVE-2026-41873 is a critical-severity flaw (CVSS 9.8) affecting pony mail. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

** 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

Why this priority

Critical severity
Remotely exploitable, no login, no user action
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 62%)
CISA exploited list	No
Weakness	CWE-444
Published	2026-04-28
Last modified	2026-10-26

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-28 16:16 UTCPublished CVE record published
2026-10-26 20:10 UTCUpdated Record last modified

apache pony mail MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy pony-mail || rpm -q pony-mail || pony-mail --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-41873?

pony mail: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-41873 being exploited?

CVE-2026-41873 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-41873 affect?

CVE-2026-41873 affects pony mail. Severity is critical (CVSS 9.8). ** 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 Pon

How urgent is CVE-2026-41873?

Priority 54/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Python vulnerabilities

References

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CVE-2026-41873: ** UNSUPPORTED WHEN ASSIGNED ** Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling