TI-2025-31135 Aliases CVE-2025-49007 GHSA-47m2-26rw-j2jw

ReDoS Vulnerability in Rack::Multipart handle_mime_head

LOW 36CWE-770Published 2025-06-04 · Updated 2025-06-05

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Partial Red Hat: 1 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-770.

Summary

Rack is a modular Ruby web server interface. Starting in version 3.1.0 and prior to version 3.1.16, there is a denial of service vulnerability in the Content-Disposition parsing component of Rack. This is very similar to the previous security issue CVE-2022-44571. Carefully crafted input can cause Content-Disposition header parsing in Rack to take an unexpected amount of time, possibly resulting in a denial of service attack vector. This header is used typically used in multipart parsing. Any applications that parse multipart posts using Rack (virtually all Rails applications) are impacted. Version 3.1.16 contains a patch for the vulnerability.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00584 48th percentileScored 2026-11-07

Fix Partial rack (rack): 3.1.16rack (RubyGems): 3.1.16Red Hat: 1 without a fix

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

Vendor	Product	Affected versions	Fixed in	Status	Source
rack	rack	3.1.0 to before 3.1.16	3.1.16	Patch available	CNA
—	rack (RubyGems)	3.1.0 to before 3.1.16	3.1.16	Patch available	GHSA-47m2-26rw-j2jw

rack Vendorrack Affected 3.1.0 to before 3.1.16 Fixed in 3.1.16 Patch available CNA
rack (RubyGems) Vendor— Affected 3.1.0 to before 3.1.16 Fixed in 3.1.16 Patch available GHSA-47m2-26rw-j2jw

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:rack:rack::::::ruby::*	3.1.0 to before 3.1.16	Vulnerable	rack

cpe:2.3:a:rack:rack:*:*:*:*:*:ruby:*:* Versions 3.1.0 to before 3.1.16 Vulnerable ·rack

Remediation

Fix · CNA rack (rack) Fixed in 3.1.16
Fix · GHSA-47m2-26rw-j2jw rack (RubyGems) Fixed in 3.1.16 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 8	Affected	No fix yet

Not affected: 5 products

Logging Subsystem for Red Hat OpenShift
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 9
Red Hat Satellite 6

Timeline

2026-10-02 Threatist record created from CVE-2025-49007
2026-10-03 Alias added: GHSA-47m2-26rw-j2jw

References

Patch 2

Advisory 2

Other 2

TI-2024-16580 Rack ReDos in content type parsing (2nd degree polynomial) CVSS 3.1HIGH 7.5
TI-2024-17236 Possible Denial of Service Vulnerability in Rack Header Parsing CVSS 3.1HIGH 7.5
TI-2024-17231 Possible DoS Vulnerability with Range Header in Rack CVSS 3.1HIGH 7.5
TI-2023-12254 Uncontrolled resource consumption in https://github.com/rack/rack CVSS 3.1HIGH 7.5
TI-2025-38165 Rack's multipart parser buffers unbounded per-part headers, enabling DoS (memory exhaustion) CVSS 3.1HIGH 7.5
TI-2025-38163 Rack's unbounded multipart preamble buffering enables DoS (memory exhaustion) CVSS 3.1HIGH 7.5

See all 36 →

Sources

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