CVE-2025-61919

HIGH EPSS 43.9%
Published Oct 10, 20258mo ago · Modified Jun 17, 20261w ago
7.5 CVSS 3.1
High
Find Similar
Published Oct 10, 2025 8mo ago
Last Modified Jun 17, 2026 1w ago

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`).

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
43.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-400 Uncontrolled Resource Consumption Resource Mgmt

Affected Products 3

VendorProductVersionRange
rackrack* <2.2.20
rackrack*≥3.0.0  –  <3.1.18
rackrack*≥3.2.0  –  <3.2.3

References 4

  • github.com https://github.com/rack/rack/commit/4e2c903991a790ee211a3021808ff4fd6fe82881
    Patch
  • github.com https://github.com/rack/rack/commit/cbd541e8a3d0c5830a3c9a30d3718ce2e124f9db
    Patch
  • github.com https://github.com/rack/rack/commit/e179614c4a653283286f5f046428cbb85f21146f
    Patch
  • github.com https://github.com/rack/rack/security/advisories/GHSA-6xw4-3v39-52mm
    MitigationThird Party Advisory

Remediation

  • github.com https://github.com/rack/rack/commit/4e2c903991a790ee211a3021808ff4fd6fe82881
    Patch
  • github.com https://github.com/rack/rack/commit/cbd541e8a3d0c5830a3c9a30d3718ce2e124f9db
    Patch
  • github.com https://github.com/rack/rack/commit/e179614c4a653283286f5f046428cbb85f21146f
    Patch