CVE-2024-1135

HighCVSS 7.5/10Last modified Jun 17, 2026

Description

Gunicorn fails to properly validate Transfer-Encoding headers, leading to HTTP Request Smuggling (HRS) vulnerabilities. By crafting requests with conflicting Transfer-Encoding headers, attackers can bypass security restrictions and access restricted endpoints. This issue is due to Gunicorn's handling of Transfer-Encoding headers, where it incorrectly processes requests with multiple, conflicting Transfer-Encoding headers, treating them as chunked regardless of the final encoding specified. This vulnerability allows for a range of attacks including cache poisoning, session manipulation, and data exposure.

Metrics

CVSS 3.0 7.5/10CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Weakness enumeration

CWE-444

Affected software

VendorProductVersions
benoitcbenoitc/gunicorn>= unspecified, <= latest
benoitcgunicorn*

References

Timeline

Published
Apr 16, 2024
Last modified
Jun 17, 2026
NVD status
Deferred

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CVE-2024-1135: High severity, CVSS 7.5 | Vulnix