CVE-2022-44571: Denial of Service Vulnerability in Rack Content-Disposition parsing

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-02-09 · updated 2026-06-17
Weakness: CWE-400

Description

There is a denial of service vulnerability in the Content-Disposition parsingcomponent of Rack fixed in 2.0.9.2, 2.1.4.2, 2.2.4.1, 3.0.0.1. This could allow an attacker to craft an input that can cause Content-Disposition header parsing in Rackto take an unexpected amount of time, possibly resulting in a denial ofservice attack vector. This header is used typically used in multipartparsing. Any applications that parse multipart posts using Rack (virtuallyall Rails applications) are impacted.

Affected products

rack: from 2.0.0 before 2.0.9.2; from 2.1.0 before 2.1.4.2; from 2.2.0 before 2.2.6.1; from 3.0.0.0 before 3.0.4.1 — fixed in 2.0.9.2, 2.1.4.2, 2.2.6.1, 3.0.4.1
Rubygems Rack: from 2.0.0 before 2.0.9.2; from 2.1.0 before 2.1.4.2; from 2.2.0 before 2.2.6.1; from 3.0.0.0 before 3.0.4.1; 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5, 2.0.6 (+23) — fixed in 2.0.9.2, 2.1.4.2, 2.2.6.1, 3.0.4.1

How to fix

Upgrade to a fixed version: rack 2.0.9.2, 2.1.4.2, 2.2.6.1, 3.0.4.1; Rubygems Rack 2.0.9.2, 2.1.4.2, 2.2.6.1, 3.0.4.1. Check the vendor advisory for mitigations.

References

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