CVE Catalog

CVE-2025-58068

CriticalCVSS 9.1
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.39%

32th percentile - higher than 32% of all known CVEs

Summary

Eventlet prior to version 0.40.3 has an HTTP Request Smuggling vulnerability in its WSGI parser due to improper handling of HTTP trailer sections. This could enable attackers to bypass front-end security controls, launch targeted attacks against active site users, and poison web caches. The issue is patched in Eventlet 0.40.3 by dropping trailers, which is a breaking change if a backend behind eventlet.wsgi proxy requires trailers.

Risk Assessment

HTTP request smuggling can lead to bypassing security controls, attacks on users, and cache poisoning, potentially resulting in unauthorized access or data leakage. This affects applications using Eventlet WSGI.

Recommendation

Update Eventlet to version 0.40.3 or later. If updating is not possible, do not use eventlet.wsgi facing untrusted clients.

Related vulnerabilities

Original NVD description (English source)

Eventlet is a concurrent networking library for Python. Prior to version 0.40.3, the Eventlet WSGI parser is vulnerable to HTTP Request Smuggling due to improper handling of HTTP trailer sections. This vulnerability could enable attackers to, bypass front-end security controls, launch targeted attacks against active site users, and poison web caches. This problem has been patched in Eventlet 0.40.3 by dropping trailers which is a breaking change if a backend behind eventlet.wsgi proxy requires trailers. A workaround involves not using eventlet.wsgi facing untrusted clients.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS