rack up to 3.1.15 Content-Disposition Parsing allocation of resources

Summaryinfo

A vulnerability, which was classified as critical, has been found in rack up to 3.1.15. This impacts an unknown function of the component Content-Disposition Parsing. This manipulation causes allocation of resources. This vulnerability is handled as CVE-2025-49007. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in rack up to 3.1.15. Affected by this vulnerability is an unknown functionality of the component Content-Disposition Parsing. The manipulation with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. As an impact it is known to affect availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2025-49007 since 05/29/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 276262 (TencentOS Server 4: pcs (TSSA-2025:0511)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.1.16 eliminates this vulnerability. Applying the patch 4795831a0a310c2d31102749e551b38faab6401f is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (276262) and EUVD (EUVD-2025-16936). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

• rack

Version

• 3.1.0
• 3.1.1
• 3.1.2
• 3.1.3
• 3.1.4
• 3.1.5
• 3.1.6
• 3.1.7
• 3.1.8
• 3.1.9
• 3.1.10
• 3.1.11
• 3.1.12
• 3.1.13
• 3.1.14
• 3.1.15

License

• open-source

Website

• Product: https://github.com/rack/rack/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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