CVE-2026-40561

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-40561
Starlet versions through 0.31 for Perl allows HTTP Request Smuggling via Improper Header Precedence. Starlet 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.

5.3 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3 Third Party Advisory
https://github.com/kazuho/Starlet/commit/a7d5dfd1862aafa43e5eaca0fdb6acf4cc15b2d0.patch Patch
https://metacpan.org/release/KAZUHO/Starlet-0.32/changes
http://www.openwall.com/lists/oss-security/2026/05/03/1 Mailing List Third Party Advisory
Configurations

Configuration 1 (hide)

cpe:2.3:a:kazuho:starlet:*:*:*:*:*:perl:*:*
History

07 May 2026, 17:15

Type Values Removed Values Added
References
  • () https://metacpan.org/release/KAZUHO/Starlet-0.32/changes -

06 May 2026, 20:26

Type Values Removed Values Added
CPE cpe:2.3:a:kazuho:starlet:*:*:*:*:*:perl:*:*
First Time Kazuho starlet
Kazuho
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://github.com/kazuho/Starlet/commit/a7d5dfd1862aafa43e5eaca0fdb6acf4cc15b2d0.patch - () https://github.com/kazuho/Starlet/commit/a7d5dfd1862aafa43e5eaca0fdb6acf4cc15b2d0.patch - Patch
References () http://www.openwall.com/lists/oss-security/2026/05/03/1 - () http://www.openwall.com/lists/oss-security/2026/05/03/1 - Mailing List, Third Party Advisory

04 May 2026, 14:16

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.3

03 May 2026, 05:15

Type Values Removed Values Added
References
  • () http://www.openwall.com/lists/oss-security/2026/05/03/1 -

03 May 2026, 01:15

Type Values Removed Values Added
New CVE
Information

Published : 2026-05-03 01:15

Updated : 2026-05-07 17:15

NVD link : CVE-2026-40561

Mitre link : CVE-2026-40561

CVE.ORG link : CVE-2026-40561

JSON object : View

Products Affected

kazuho

  • starlet
CWE
CWE-444

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