Description
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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Phusion | Passenger | 6.0.21 – < 6.0.26 | 6.0.26 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | passenger | 6.0.26+ds-1 | — |
| Debian 13 | passenger | 6.0.26+ds-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | passenger | No fix yet | — |
| Ubuntu 26.04 LTS | passenger | No fix yet | — |
| Ubuntu 25.10 | passenger | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| RubyGems | passenger | >= 6.0.21, < 6.0.26 | 6.0.26 | GHSA-2cj2-qqxj-5m3r |
References
- https://www.phusionpassenger.com/support
- https://github.com/phusion/passenger/compare/release-6.0.25...release-6.0.26
- https://github.com/phusion/passenger/releases/tag/release-6.0.26
- https://blog.phusion.nl/2025/02/19/passenger-6-0-26/
- https://github.com/phusion/passenger/commit/bb15591646687064ab2d578d5f9660b2a4168017