Vulnerabilities in pkg:gem/passenger

PACKAGE
Advisory Identifier: GHSA-2cj2-qqxj-5m3r
Share
Advisory Summary

CVE-2025-26803 is a MODERATE (CVSS 5.3) denial of service vulnerability (CWE-908: Use of Uninitialized Resource) affecting Passenger libraries in the RubyGems ecosystem. The issue involves phusion passenger denial of service. Remediation is available by upgrading affected packages to version 6.0.26.

14 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:gem/passenger

14 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:gem/passenger. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-2cj2-qqxj-5m3r CVE-2025-26803 MODERATE Phusion Passenger denial of service
GHSA-8mw8-j583-vqfg CVE-2012-6135 HIGH RubyGems passenger gem allows remote attackers to delete files
GHSA-9qj7-jvg4-qr2x CVE-2013-2119 MODERATE Phusion Passenger Denial of Service
GHSA-c7j7-p5jq-26ff CVE-2014-1831 LOW Insecure use of temporary files in passenger
GHSA-fxwv-953p-7qpf CVE-2015-7519 LOW Phusion Passenger allows remote attackers to spoof headers
GHSA-qw8w-2xcp-xg59 CVE-2014-1832 LOW Insecure use of temporary files in Phusion passenger
GHSA-jjcj-fgfm-9g9r CVE-2018-12029 HIGH Phusion Passenger Race Condition Allows Privilege Escalation
GHSA-7cv3-gvmc-8mq5 CVE-2018-12026 CRITICAL Phusion Passenger SpawningKit Contains Arbitrary Read/Write Vulnerability
GHSA-jjhj-8gx7-x836 CVE-2018-12028 HIGH Incorrect Access Control in Phusion Passenger
GHSA-whfx-877c-5p28 CVE-2018-12027 HIGH Insecure Permissions in Phusion Passenger
GHSA-w6rc-q387-vpgq CVE-2013-4136 MODERATE insecure temporary directory usage in passenger
GHSA-4284-jfhc-f854 CVE-2018-12615 MODERATE Phusion Passenger incorrect permission assignment
GHSA-cv3f-px9r-54hm CVE-2017-16355 MODERATE Phusion Passenger information disclosure
GHSA-cqxw-3p7v-p9gr CVE-2016-10345 HIGH Phusion Passenger uses a known /tmp filename

CVE-2025-26803 at a Glance

CVE Identifier CVE-2025-26803
GHSA Identifier GHSA-2cj2-qqxj-5m3r
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-908: Use of Uninitialized Resource
Affected Product Passenger
Package Ecosystem RubyGems
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability Low (A:L)

How to Fix CVE-2025-26803

To remediate this vulnerability, upgrade all affected Passenger dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

passenger fixed: 6.0.26 
Upgrade passenger to 6.0.26
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for passenger

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-26803, inspect your project dependencies for Passenger:

inspect dependencies for passenger

Analyze the terminal output to locate any version of Passenger in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 6.0.26), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-908: Use of Uninitialized Resource, where the product uses or accesses a resource that has not been initialized. In Passenger, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2025-26803 Affected Passenger Versions

1 component(s)
Fixed Versions:
6.0.26
Product / Package Ecosystem Affected Versions Fixed Version
passenger
gem/passenger
RubyGems
≥ 6.0.21
< 6.0.26
6.0.26

References

NVD — CVE-2025-26803 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-26803
Security Fix Commit FIX COMMIT
https://github.com/phusion/passenger/commit/bb15591646687064ab2d578d5f9660b2a4168017
blog.phusion.nl/2025/02/19/passenge... WEB
https://blog.phusion.nl/2025/02/19/passenger-6-0-26
Passenger Source Repository REPOSITORY
https://github.com/phusion/passenger
Passenger Source Repository REPOSITORY
https://github.com/phusion/passenger/compare/release-6.0.25...release-6.0.26
Passenger Release RELEASE
https://github.com/phusion/passenger/releases/tag/release-6.0.26
Passenger Source Repository REPOSITORY
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/passenger/CVE-2025-26803.yml
Passenger Security Information SECURITY
https://www.phusionpassenger.com/support

Frequently Asked Questions

What is CVE-2025-26803?
CVE-2025-26803 is a security vulnerability in Passenger involving Phusion Passenger denial of service under CWE-908: Use of Uninitialized Resource.
Which Passenger versions are affected?
Affected versions include releases prior to 6.0.26 across affected packages: passenger.
What version fixes CVE-2025-26803?
Upgrading to 6.0.26 (or the latest patched release for your respective branch) resolves the vulnerability.
Is passenger affected?
Yes, passenger is affected in releases prior to 6.0.26. Upgrade your dependency to 6.0.26 or later.
What is the CVSS score of CVE-2025-26803?
CVE-2025-26803 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
What CWE is associated with CVE-2025-26803?
CVE-2025-26803 is classified under CWE-908: Use of Uninitialized Resource (The product uses or accesses a resource that has not been initialized.).
How can I check RubyGems dependencies for CVE-2025-26803?
Run the dependency tree command: 'inspect dependencies for passenger'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-2cj2-qqxj-5m3r",
  "modified" : "2025-02-26T21:42:55Z",
  "published" : "2025-02-24T18:32:42Z",
  "aliases" : [ "CVE-2025-26803" ],
  "summary" : "Phusion Passenger denial of service ",
  "details" : "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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "passenger"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "6.0.21"
      }, {
        "fixed" : "6.0.26"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-26803"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/phusion/passenger/commit/bb15591646687064ab2d578d5f9660b2a4168017"
  }, {
    "type" : "WEB",
    "url" : "https://blog.phusion.nl/2025/02/19/passenger-6-0-26"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/phusion/passenger"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/phusion/passenger/compare/release-6.0.25...release-6.0.26"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/phusion/passenger/releases/tag/release-6.0.26"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/passenger/CVE-2025-26803.yml"
  }, {
    "type" : "WEB",
    "url" : "https://www.phusionpassenger.com/support"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-908" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-02-24T20:49:38Z",
    "nvd_published_at" : "2025-02-24T16:15:15Z"
  }
}