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TI-2025-19710 Aliases CVE-2025-26803GHSA-2cj2-qqxj-5m3r

Use of uninitialized resource in Phusion Passenger

Priority MEDIUM 40CWE-908Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-908 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00622 50th percentileScored 2026-11-07
Fix Fixed Passenger (Phusion): 6.0.26passenger (RubyGems): 6.0.26

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
PhusionPassenger6.0.21 to before 6.0.266.0.26Patch availableCNA
—passenger (RubyGems)6.0.21 to before 6.0.266.0.26Patch availableGHSA-2cj2-qqxj-5m3r
  • Passenger VendorPhusion Affected 6.0.21 to before 6.0.26 Fixed in 6.0.26 Patch available CNA
  • passenger (RubyGems) Vendor— Affected 6.0.21 to before 6.0.26 Fixed in 6.0.26 Patch available GHSA-2cj2-qqxj-5m3r

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:phusion:passenger:*:*:*:*:*:*:*:*6.0.21 to before 6.0.26VulnerablePhusion
  • cpe:2.3:a:phusion:passenger:*:*:*:*:*:*:*:* Versions 6.0.21 to before 6.0.26 Vulnerable ·Phusion

Remediation

  • Fix · CNA Passenger (Phusion) Fixed in 6.0.26
  • Fix · GHSA-2cj2-qqxj-5m3r passenger (RubyGems) Fixed in 6.0.26 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-26803
  2. 2026-10-03 Alias added: GHSA-2cj2-qqxj-5m3r
  3. 2026-11-05 EPSS moved to the 50th–90th percentile

References

Patch 3

Advisory 2

Other 4

  • TI-2018-08619 During the spawning of a malicious Passenger-managed application, SpawningKit in Phusion… CVSS 3.0CRITICAL 9.8
  • TI-2018-08620 An Insecure Permissions vulnerability in SpawningKit in Phusion Passenger 5.3.x before… CVSS 3.0HIGH 8.8
  • TI-2012-05097 RubyGems passenger 4.0.0 betas 1 and 2 allows remote attackers to delete arbitrary files during the startup process. CVSS 3.1HIGH 7.5
  • TI-2018-08621 An Incorrect Access Control vulnerability in SpawningKit in Phusion Passenger 5.3.x… CVSS 3.0HIGH 7.8
  • TI-2016-08407 In Phusion Passenger before 5.1.0, a known /tmp filename was used during… CVSS 3.0HIGH 7.8
  • TI-2018-08622 A race condition in the nginx module in Phusion Passenger 3.x through 5.x before 5.3.2… CVSS 3.0HIGH 7.0
See all 12 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences