CVE-2026-40562

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-40562
Gazelle versions through 0.49 for Perl allows HTTP Request Smuggling via Improper Header Precedence. Gazelle incorrectly prioritizes "Content-Length" over "Transfer-Encoding: chunked" when both headers are present in an HTTP request. Per RFC 7230 3.3.3, Transfer-Encoding must take precedence. An attacker could exploit this to smuggle malicious HTTP requests via a front-end reverse proxy.

7.5 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3 Third Party Advisory
https://metacpan.org/release/KAZEBURO/Gazelle-0.50/changes Release Notes
https://security.metacpan.org/patches/G/Gazelle/0.49/CVE-2026-40562-r1.patch Patch
http://www.openwall.com/lists/oss-security/2026/05/06/7 Mailing List Third Party Advisory
Configurations

Configuration 1 (hide)

cpe:2.3:a:kazeburo:gazelle:*:*:*:*:*:perl:*:*
History

11 May 2026, 15:04

Type Values Removed Values Added
References () https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3 - () https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3 - Third Party Advisory
References () https://metacpan.org/release/KAZEBURO/Gazelle-0.50/changes - () https://metacpan.org/release/KAZEBURO/Gazelle-0.50/changes - Release Notes
References () https://security.metacpan.org/patches/G/Gazelle/0.49/CVE-2026-40562-r1.patch - () https://security.metacpan.org/patches/G/Gazelle/0.49/CVE-2026-40562-r1.patch - Patch
References () http://www.openwall.com/lists/oss-security/2026/05/06/7 - () http://www.openwall.com/lists/oss-security/2026/05/06/7 - Mailing List, Third Party Advisory
CPE cpe:2.3:a:kazeburo:gazelle:*:*:*:*:*:perl:*:*
First Time Kazeburo
Kazeburo gazelle

07 May 2026, 17:15

Type Values Removed Values Added
References
  • () https://metacpan.org/release/KAZEBURO/Gazelle-0.50/changes -

06 May 2026, 17:16

Type Values Removed Values Added
References
  • () http://www.openwall.com/lists/oss-security/2026/05/06/7 -

06 May 2026, 15:16

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.5

06 May 2026, 13:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-05-06 13:16

Updated : 2026-05-11 15:04

NVD link : CVE-2026-40562

Mitre link : CVE-2026-40562

CVE.ORG link : CVE-2026-40562

JSON object : View

Products Affected

kazeburo

  • gazelle
CWE
CWE-444

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