Vulnerability in Phusion Passenger
CVE-2025-26803
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.006 (47.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.000
Affected products
- Phusion Passenger — versions 6.0.21
Weakness classification (CWE)
References
- www.phusionpassenger.com/support (Product)
- github.com/phusion/passenger/compare/release-6.0.25...release-6.0.26 (Patch)
- github.com/phusion/passenger/releases/tag/release-6.0.26 (Patch)
- blog.phusion.nl/2025/02/19/passenger-6-0-26/ (Vendor Advisory)
- github.com/phusion/passenger/commit/bb15591646687064ab2d578d5f9660b2a4168017 (Patch)
Frequently asked questions
- What is CVE-2025-26803?
- CVE-2025-26803 is a medium-severity vulnerability in Phusion Passenger, classified under Use of Uninitialized Resource. CVSS score: 5.3/10. Published 2025-02-24.
- How severe is CVE-2025-26803?
- Medium severity. CVSS v3 base score is 5.3 out of 10.