CVE-2025-61771 — Uncontrolled Resource Consumption in Rack
Severity
7.5HIGHNVD
EPSS
0.1%
top 73.01%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
1
Timeline
PublishedOct 7
Latest updateJan 14
Description
Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, ``Rack::Multipart::Parser` stores non-file form fields (parts without a `filename`) entirely in memory as Ruby `String` objects. A single large text field in a multipart/form-data request (hundreds of megabytes or more) can consume equivalent process memory, potentially leading to out-of-memory (OOM) conditions and denial of service (DoS). Attackers can send large non-file fields to trigger excessive mem…
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6
Patches
🔴Vulnerability Details
5GHSA▶
Rack: Multipart parser buffers large non‑file fields entirely in memory, enabling DoS (memory exhaustion)↗2025-10-07
OSV▶
Rack: Multipart parser buffers large non‑file fields entirely in memory, enabling DoS (memory exhaustion)↗2025-10-07
CVEList▶
Rack's multipart parser buffers large non‑file fields entirely in memory, enabling DoS (memory exhaustion)↗2025-10-07