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.

Advisories
Source ID Title
Debian DLA Debian DLA DLA-3947-1 puma security update
EUVD EUVD EUVD-2024-0323 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.
Github GHSA Github GHSA GHSA-c2f4-cvqm-65w2 Puma HTTP Request/Response Smuggling vulnerability
Ubuntu USN Ubuntu USN USN-6597-1 Puma vulnerability
Ubuntu USN Ubuntu USN USN-6682-1 Puma vulnerabilities
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Tue, 03 Jun 2025 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2025-06-03T14:37:47.971Z

Reserved: 2023-12-29T16:10:20.366Z

Link: CVE-2024-21647

cve-icon Vulnrichment

Updated: 2024-08-01T22:27:36.196Z

cve-icon NVD

Status : Modified

Published: 2024-01-08T14:15:47.640

Modified: 2024-11-21T08:54:47.780

Link: CVE-2024-21647

cve-icon Redhat

Severity : Important

Publid Date: 2024-01-08T00:00:00Z

Links: CVE-2024-21647 - Bugzilla

cve-icon OpenCVE Enrichment

No data.