ReDoS Vulnerability in Rack::Multipart handle_mime_head
### Summary 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. ### Details 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. ### Credits Thanks to [scyoon](https://hackerone.com/scyoon) for reporting this to the Rails security team
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2025-49007US | medium5.3 | — | ||
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 co… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/rack/rackPACKAGE
- https://github.com/rack/rack/commit/4795831a0a310c2d31102749e551b38faab6401fWEB
- https://github.com/rack/rack/commit/aed514df37e33907df3c971ed3ca9a0a20ac2901WEB
- https://github.com/rack/rack/security/advisories/GHSA-47m2-26rw-j2jwWEB
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2025-49007.ymlWEB
- https://nvd.nist.gov/vuln/detail/CVE-2025-49007ADVISORY
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