GHSA-2cj2-qqxj-5m3r BIT-passenger-2025-26803 BIT-passenger-apache-module-2025-26803 BIT-passenger-nginx-module-2025-26803 CVE-2025-26803
Phusion Passenger denial of service
- Severity
- 5.3 / 10
- High · CVSS 3.1
- Exploit chance (EPSS)
- 0.62%
- Chance of exploitation in the next 30 days. Higher than 49.59% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-908 Use of Uninitialized Resource
- Fix
6.0.26- Upgrade passenger to this version or later
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 versions
RubyGems
| Package | Vulnerable | Fixed in |
|---|---|---|
| passenger | >= 6.0.21, < 6.0.26 |
6.0.26 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
passenger RubyGems → 6.0.26
- bundler
bundle update passenger # Gemfile: gem "passenger", ">= 6.0.26"
Severity breakdown
CVSS 3.1 5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Weakness
CWE-908: Use of Uninitialized Resource
The product uses or accesses a resource that has not been initialized.
How to prevent it
- Implementation: Explicitly initialize the resource before use. If this is performed through an API function or standard procedure, follow all required steps.
- Implementation: Pay close attention to complex conditionals that affect initialization, since some branches might not perform the initialization.
- Implementation: Avoid race conditions (CWE-362) during initialization routines.
- Build and Compilation: Run or compile the product with settings that generate warnings about uninitialized variables or data.
References
Advisories
Packages
Other links
- github.com/phusion/passenger/commit/bb15591646687064ab2d578d5f9660b2a4168017
- blog.phusion.nl/2025/02/19/passenger-6-0-26
- 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
- phusionpassenger.com/support
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-jjcj-fgfm-9g9r Phusion Passenger Race Condition Allows Privilege Escalation | High | Also affects passenger |
| GHSA-7cv3-gvmc-8mq5 Phusion Passenger SpawningKit Contains Arbitrary Read/Write Vulnerability | Critical | Also affects passenger |
| GHSA-4284-jfhc-f854 Phusion Passenger incorrect permission assignment | Medium | Also affects passenger |
| GHSA-whfx-877c-5p28 Insecure Permissions in Phusion Passenger | High | Also affects passenger |
| GHSA-jjhj-8gx7-x836 Incorrect Access Control in Phusion Passenger | High | Also affects passenger |
| GHSA-cv3f-px9r-54hm Phusion Passenger information disclosure | Medium | Also affects passenger |
| GHSA-8mw8-j583-vqfg RubyGems passenger gem allows remote attackers to delete files | High | Also affects passenger |
| GHSA-qw8w-2xcp-xg59 Insecure use of temporary files in Phusion passenger | Low | Also affects passenger |
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