CVE-2024-21647

Published: Jan 8, 2024Modified: Jun 17, 2026

7.5

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitability: 3.9 / Impact: 3.6

Source: NVD

Description

Puma is a web server for Ruby/Rack applications built for parallelism. Prior to version 6.4.2, puma exhibited incorrect behavior when parsing chunked transfer encoding bodies in a way that allowed HTTP request smuggling. Fixed versions limits the size of chunk extensions. Without this limit, an attacker could cause unbounded resource (CPU, network bandwidth) consumption. This vulnerability has been fixed in versions 6.4.2 and 5.6.8.

Affected (2)

Products: Puma: Puma

1 product

Configuration A

2 vulnerable

Vulnerable Software	Affected Versions
Puma Puma	Before 5.6.8
Puma Puma	From 6.0.0 to 6.4.2

Related CWEs

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

References (5)

https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93

Source: security-advisories@github.com

Patch

https://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2

Source: security-advisories@github.com

Vendor Advisory

https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93

Source: af854a3a-2127-422b-91ae-364da2661108

Patch

https://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2

Source: af854a3a-2127-422b-91ae-364da2661108

Vendor Advisory

https://lists.debian.org/debian-lts-announce/2024/11/msg00004.html

Source: af854a3a-2127-422b-91ae-364da2661108

Timeline

No history available yet.