PT-2026-35863 · Starman · Starman

Cpansec · Published 2026-04-28 · Updated 2026-05-22 · CVE-2026-40560

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Starman versions prior to 0.4018

Description Improper header precedence allows HTTP Request Smuggling. The software incorrectly prioritizes the Content-Length header over Transfer-Encoding: chunked when both are present in an HTTP request, which contradicts RFC 7230 3.3.3. This can be exploited to smuggle malicious HTTP requests through a front-end reverse proxy.

Recommendations Update to version 0.4018 or later.

Fix

HTTP Request/Response Smuggling

Weakness Enumeration

CWE-444

Related Identifiers

CVE-2026-40560

OPENSUSE-SU-2026:10757-1

Affected Products

Starman

References · 19

• https://github.com/miyagawa/Starman/commit/ced205f0805027e9d9c0731f8c40b104220604ed.patch · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-40560 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-40560 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-40560 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-40560 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-40560 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2026:10757-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-40560 · Security Note
• https://lists.security.metacpan.org/cve-announce/msg/39426182 · Note
• https://suse.com/security/cve/CVE-2026-40560 · Note
• http://openwall.com/lists/oss-security/2026/04/29/1 · Note
• https://twitter.com/CVEarity/status/2049533687667331225 · Twitter Post
• https://twitter.com/CVEnew/status/2049350421089825078 · Twitter Post
• https://twitter.com/oss_security/status/2049328694762553644 · Twitter Post
• https://twitter.com/DFIR_Lab/status/2057613752309035139 · Twitter Post