Starman versions before 0.4018 for Perl allows HTTP Request Smuggling via Improper Header…
Priority LOW 39CWE-444Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.
Summary
Starman versions before 0.4018 for Perl allows HTTP Request Smuggling via Improper Header Precedence. Starman 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 0.00487 42nd percentileScored 2026-11-07
Fix Fixed Starman (MIYAGAWA): 0.4018
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
Remediation
- Fix · CNA Starman (MIYAGAWA) Fixed in 0.4018
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2026-40560
- 2026-10-03 Alias added: GHSA-gwjf-hg8j-jwvr
- 2026-10-25 Priority changed: MEDIUM → LOW
References
Sources
- CVE-2026-40560 · CVE Program
- CVE-2026-40560 · NVD
- FIRST EPSS
- GHSA-gwjf-hg8j-jwvr · GitHub Advisory Database · CC BY 4.0
- CVE-2026-40560 · Red Hat security data · CC BY 4.0
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