CVE-2025-26803: Phusion Passenger

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

The http parser in Phusion Passenger 6.0.21 through 6.0.25 before 6.0.26 allows a denial of service during parsing of a request with an invalid HTTP method.

Affected products

• Phusion Passenger: from 6.0.21, before 6.0.26 (fixed in 6.0.26)

Published 2025-02-24. Last modified 2026-06-17.