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CVE-2025-26803: Phusion Passenger denial of service

February 24, 2025 (updated February 26, 2025)

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.

References

  • blog.phusion.nl/2025/02/19/passenger-6-0-26
  • github.com/advisories/GHSA-2cj2-qqxj-5m3r
  • github.com/phusion/passenger
  • github.com/phusion/passenger/commit/bb15591646687064ab2d578d5f9660b2a4168017
  • github.com/phusion/passenger/compare/release-6.0.25...release-6.0.26
  • github.com/phusion/passenger/releases/tag/release-6.0.26
  • github.com/rubysec/ruby-advisory-db/blob/master/gems/passenger/CVE-2025-26803.yml
  • nvd.nist.gov/vuln/detail/CVE-2025-26803
  • www.phusionpassenger.com/support

Code Behaviors & Features

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Affected versions

All versions starting from 6.0.21 before 6.0.26

Fixed versions

  • 6.0.26

Solution

Upgrade to version 6.0.26 or above.

Impact 5.3 MEDIUM

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

Learn more about CVSS

Weakness

  • CWE-908: Use of Uninitialized Resource

Source file

gem/passenger/CVE-2025-26803.yml

Spotted a mistake? Edit the file on GitLab.

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