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TI-2026-29302 Aliases CVE-2026-40561GHSA-2xqx-75wg-w86v

Starlet versions through 0.31 for Perl allows HTTP Request Smuggling via Improper Header…

Priority LOW 30CWE-444Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00364 30th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
KAZUHOStarletup to 0.31—No fix listedCNA
  • Starlet VendorKAZUHO Affected up to 0.31 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:kazuho:starlet:*:*:*:*:*:perl:*:*up to 0.31VulnerableKAZUHO
  • cpe:2.3:a:kazuho:starlet:*:*:*:*:*:perl:*:* Versions up to 0.31 Vulnerable ·KAZUHO

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-40561
  2. 2026-10-03 Alias added: GHSA-2xqx-75wg-w86v

References

Patch 1

Advisory 2

Other 1

Sources

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