CVE-2025-61919Rack is a modular Ruby web server interface.
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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`).
- CVSS
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-400
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
rack rack rack:rack | before 2.2.20; from 3.0.0 before 3.1.18; from 3.2.0 before 3.2.3 | NVD |
References
- https://github.com/rack/rack/commit/4e2c903991a790ee211a3021808ff4fd6fe82881patch
- https://github.com/rack/rack/commit/cbd541e8a3d0c5830a3c9a30d3718ce2e124f9dbpatch
- https://github.com/rack/rack/commit/e179614c4a653283286f5f046428cbb85f21146fpatch
- https://github.com/rack/rack/security/advisories/GHSA-6xw4-3v39-52mmmitigation, third-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.