Vulnerability Details CVE-2025-61919
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`).
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 25.1%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2025-61919
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cpe:2.3:a:rack:rack:0.1
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cpe:2.3:a:rack:rack:0.2
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cpe:2.3:a:rack:rack:0.3
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cpe:2.3:a:rack:rack:0.4
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cpe:2.3:a:rack:rack:0.9
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cpe:2.3:a:rack:rack:0.9.1
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cpe:2.3:a:rack:rack:1.0
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cpe:2.3:a:rack:rack:1.0.1
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cpe:2.3:a:rack:rack:1.1
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cpe:2.3:a:rack:rack:1.1.2
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cpe:2.3:a:rack:rack:1.1.3
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cpe:2.3:a:rack:rack:1.1.4
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cpe:2.3:a:rack:rack:1.1.5
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cpe:2.3:a:rack:rack:1.1.6
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cpe:2.3:a:rack:rack:1.2
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cpe:2.3:a:rack:rack:1.2.1
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cpe:2.3:a:rack:rack:1.2.2
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cpe:2.3:a:rack:rack:1.2.3
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cpe:2.3:a:rack:rack:1.2.4
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cpe:2.3:a:rack:rack:1.2.5
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cpe:2.3:a:rack:rack:1.2.6
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cpe:2.3:a:rack:rack:1.2.7
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cpe:2.3:a:rack:rack:1.2.8
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cpe:2.3:a:rack:rack:1.3.0
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cpe:2.3:a:rack:rack:1.3.1
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cpe:2.3:a:rack:rack:1.3.10
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cpe:2.3:a:rack:rack:1.3.2
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cpe:2.3:a:rack:rack:1.3.3
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cpe:2.3:a:rack:rack:1.3.4
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cpe:2.3:a:rack:rack:1.3.5
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cpe:2.3:a:rack:rack:1.3.6
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cpe:2.3:a:rack:rack:1.3.7
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cpe:2.3:a:rack:rack:1.3.8
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cpe:2.3:a:rack:rack:1.3.9
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cpe:2.3:a:rack:rack:1.4.0
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cpe:2.3:a:rack:rack:1.4.1
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cpe:2.3:a:rack:rack:1.4.2
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cpe:2.3:a:rack:rack:1.4.3
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cpe:2.3:a:rack:rack:1.4.4
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cpe:2.3:a:rack:rack:1.4.5
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cpe:2.3:a:rack:rack:1.4.6
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cpe:2.3:a:rack:rack:1.4.7
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cpe:2.3:a:rack:rack:1.5.0
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cpe:2.3:a:rack:rack:1.5.1
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cpe:2.3:a:rack:rack:1.5.2
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cpe:2.3:a:rack:rack:1.5.3
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cpe:2.3:a:rack:rack:1.5.4
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cpe:2.3:a:rack:rack:1.5.5
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cpe:2.3:a:rack:rack:1.6.0
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cpe:2.3:a:rack:rack:1.6.1
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cpe:2.3:a:rack:rack:1.6.10
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cpe:2.3:a:rack:rack:1.6.11
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cpe:2.3:a:rack:rack:1.6.12
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cpe:2.3:a:rack:rack:1.6.13
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cpe:2.3:a:rack:rack:1.6.2
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cpe:2.3:a:rack:rack:1.6.3
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cpe:2.3:a:rack:rack:1.6.4
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cpe:2.3:a:rack:rack:1.6.5
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cpe:2.3:a:rack:rack:1.6.6
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cpe:2.3:a:rack:rack:1.6.7
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cpe:2.3:a:rack:rack:1.6.8
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cpe:2.3:a:rack:rack:1.6.9
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cpe:2.3:a:rack:rack:2.0.0
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cpe:2.3:a:rack:rack:2.0.1
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cpe:2.3:a:rack:rack:2.0.2
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cpe:2.3:a:rack:rack:2.0.3
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cpe:2.3:a:rack:rack:2.0.4
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cpe:2.3:a:rack:rack:2.0.5
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cpe:2.3:a:rack:rack:2.0.6
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cpe:2.3:a:rack:rack:2.0.7
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cpe:2.3:a:rack:rack:2.0.8
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cpe:2.3:a:rack:rack:2.0.9
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cpe:2.3:a:rack:rack:2.0.9.2
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cpe:2.3:a:rack:rack:2.0.9.3
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cpe:2.3:a:rack:rack:2.1.0
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cpe:2.3:a:rack:rack:2.1.1
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cpe:2.3:a:rack:rack:2.1.2
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cpe:2.3:a:rack:rack:2.1.3
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cpe:2.3:a:rack:rack:2.1.4
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cpe:2.3:a:rack:rack:2.1.4.2
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cpe:2.3:a:rack:rack:2.1.4.3
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cpe:2.3:a:rack:rack:2.2.0
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cpe:2.3:a:rack:rack:2.2.1
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cpe:2.3:a:rack:rack:2.2.10
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cpe:2.3:a:rack:rack:2.2.11
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cpe:2.3:a:rack:rack:2.2.12
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cpe:2.3:a:rack:rack:2.2.13
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cpe:2.3:a:rack:rack:2.2.14
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cpe:2.3:a:rack:rack:2.2.15
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cpe:2.3:a:rack:rack:2.2.16
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cpe:2.3:a:rack:rack:2.2.17
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cpe:2.3:a:rack:rack:2.2.18
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cpe:2.3:a:rack:rack:2.2.19
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cpe:2.3:a:rack:rack:2.2.2
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cpe:2.3:a:rack:rack:2.2.3
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cpe:2.3:a:rack:rack:2.2.4
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cpe:2.3:a:rack:rack:2.2.4.1
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cpe:2.3:a:rack:rack:2.2.5
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cpe:2.3:a:rack:rack:2.2.6
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cpe:2.3:a:rack:rack:2.2.6.1
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cpe:2.3:a:rack:rack:2.2.6.2
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cpe:2.3:a:rack:rack:2.2.6.3
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cpe:2.3:a:rack:rack:2.2.6.4
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cpe:2.3:a:rack:rack:2.2.7
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cpe:2.3:a:rack:rack:2.2.8
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cpe:2.3:a:rack:rack:2.2.8.1
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cpe:2.3:a:rack:rack:2.2.9
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cpe:2.3:a:rack:rack:3.0.0
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cpe:2.3:a:rack:rack:3.0.1
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cpe:2.3:a:rack:rack:3.0.10
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cpe:2.3:a:rack:rack:3.0.12
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cpe:2.3:a:rack:rack:3.0.13
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cpe:2.3:a:rack:rack:3.0.14
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cpe:2.3:a:rack:rack:3.0.15
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cpe:2.3:a:rack:rack:3.0.16
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cpe:2.3:a:rack:rack:3.0.17
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cpe:2.3:a:rack:rack:3.0.18
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cpe:2.3:a:rack:rack:3.0.2
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cpe:2.3:a:rack:rack:3.0.3
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cpe:2.3:a:rack:rack:3.0.4
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cpe:2.3:a:rack:rack:3.0.4.1
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cpe:2.3:a:rack:rack:3.0.4.2
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cpe:2.3:a:rack:rack:3.0.5
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cpe:2.3:a:rack:rack:3.0.6
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cpe:2.3:a:rack:rack:3.0.6.1
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cpe:2.3:a:rack:rack:3.0.7
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cpe:2.3:a:rack:rack:3.0.8
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cpe:2.3:a:rack:rack:3.0.9
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cpe:2.3:a:rack:rack:3.0.9.1
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cpe:2.3:a:rack:rack:3.1.0
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cpe:2.3:a:rack:rack:3.1.1
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cpe:2.3:a:rack:rack:3.1.10
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cpe:2.3:a:rack:rack:3.1.11
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cpe:2.3:a:rack:rack:3.1.12
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cpe:2.3:a:rack:rack:3.1.13
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cpe:2.3:a:rack:rack:3.1.14
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cpe:2.3:a:rack:rack:3.1.15
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cpe:2.3:a:rack:rack:3.1.16
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cpe:2.3:a:rack:rack:3.1.17
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cpe:2.3:a:rack:rack:3.1.2
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cpe:2.3:a:rack:rack:3.1.3
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cpe:2.3:a:rack:rack:3.1.4
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cpe:2.3:a:rack:rack:3.1.5
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cpe:2.3:a:rack:rack:3.1.6
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cpe:2.3:a:rack:rack:3.1.7
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cpe:2.3:a:rack:rack:3.1.8
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cpe:2.3:a:rack:rack:3.1.9
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cpe:2.3:a:rack:rack:3.2.0
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cpe:2.3:a:rack:rack:3.2.1
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cpe:2.3:a:rack:rack:3.2.2