CVE-2023-40175

CRITICAL EPSS 49.9%
Published Aug 18, 20232y ago · Modified Jun 17, 20262w ago
9.8 CVSS 3.1
Critical
Find Similar
Published Aug 18, 2023 2y ago
Last Modified Jun 17, 2026 2w ago

Description

Puma is a Ruby/Rack web server built for parallelism. Prior to versions 6.3.1 and 5.6.7, puma exhibited incorrect behavior when parsing chunked transfer encoding bodies and zero-length Content-Length headers in a way that allowed HTTP request smuggling. Severity of this issue is highly dependent on the nature of the web site using puma is. This could be caused by either incorrect parsing of trailing fields in chunked transfer encoding bodies or by parsing of blank/zero-length Content-Length headers. Both issues have been addressed and this vulnerability has been fixed in versions 6.3.1 and 5.6.7. Users are advised to upgrade. There are no known workarounds for this vulnerability.

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
49.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-444

Affected Products 2

VendorProductVersionRange
pumapuma* <5.6.7
pumapuma*≥6.0.0  –  <6.3.1

References 2

  • github.com https://github.com/puma/puma/commit/690155e7d644b80eeef0a6094f9826ee41f1080a
    Patch
  • github.com https://github.com/puma/puma/security/advisories/GHSA-68xg-gqqm-vgj8
    Vendor Advisory

Remediation

  • github.com https://github.com/puma/puma/commit/690155e7d644b80eeef0a6094f9826ee41f1080a
    Patch