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TI-2026-29303 Aliases CVE-2026-40562GHSA-mjw2-gf6p-382h

Gazelle versions through 0.49 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
None · High · None
Fix status
No fix listed

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

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00319 25th 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
KAZEBUROGazelleup to 0.49—No fix listedCNA
  • Gazelle VendorKAZEBURO Affected up to 0.49 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:kazeburo:gazelle:*:*:*:*:*:perl:*:*before 0.50VulnerableKAZEBURO
  • cpe:2.3:a:kazeburo:gazelle:*:*:*:*:*:perl:*:* Versions before 0.50 Vulnerable ·KAZEBURO

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-40562
  2. 2026-10-03 Alias added: GHSA-mjw2-gf6p-382h

References

Patch 1

Advisory 2

Other 1

Sources

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