CVE-2025-61919
Publication date 13 October 2025
Last updated 13 October 2025
Ubuntu priority
Cvss 3 Severity Score
Description
Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, `Rack::Request#POST` reads the entire request body into memory for `Content-Type: application/x-www-form-urlencoded`, calling `rack.input.read(nil)` without enforcing a length or cap. Large request bodies can therefore be buffered completely into process memory before parsing, leading to denial of service (DoS) through memory exhaustion. Users should upgrade to Rack version 2.2.20, 3.1.18, or 3.2.3, anu of which enforces form parameter limits using `query_parser.bytesize_limit`, preventing unbounded reads of `application/x-www-form-urlencoded` bodies. Additionally, enforce strict maximum body size at the proxy or web server layer (e.g., Nginx `client_max_body_size`, Apache `LimitRequestBody`).
Status
Package | Ubuntu Release | Status |
---|---|---|
ruby-rack | 25.10 questing |
Needs evaluation
|
25.04 plucky |
Needs evaluation
|
|
24.04 LTS noble |
Needs evaluation
|
|
22.04 LTS jammy |
Needs evaluation
|
|
20.04 LTS focal |
Needs evaluation
|
|
18.04 LTS bionic |
Needs evaluation
|
|
16.04 LTS xenial |
Needs evaluation
|
|
14.04 LTS trusty |
Needs evaluation
|
Severity score breakdown
Parameter | Value |
---|---|
Base score |
|
Attack vector | Network |
Attack complexity | Low |
Privileges required | None |
User interaction | None |
Scope | Unchanged |
Confidentiality | None |
Integrity impact | None |
Availability impact | High |
Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
References
Other references
- https://www.cve.org/CVERecord?id=CVE-2025-61919
- https://github.com/rack/rack/security/advisories/GHSA-6xw4-3v39-52mm
- https://github.com/rack/rack/commit/e179614c4a653283286f5f046428cbb85f21146f (v3.2.3)
- https://github.com/rack/rack/commit/cbd541e8a3d0c5830a3c9a30d3718ce2e124f9db (v3.1.18)
- https://github.com/rack/rack/commit/4e2c903991a790ee211a3021808ff4fd6fe82881 (v2.2.20)
- https://github.com/rack/rack/commit/4e2c903991a790ee211a3021808ff4fd6fe82881
- https://github.com/rack/rack/commit/cbd541e8a3d0c5830a3c9a30d3718ce2e124f9db
- https://github.com/rack/rack/commit/e179614c4a653283286f5f046428cbb85f21146f