Eventlet affected by HTTP request smuggling in unparsed trailers
### Impact 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 - Poison web caches ### Patches Problem has been patched in eventlet 0.40.3. The patch just drops trailers. If a backend behind eventlet.wsgi proxy requires trailers, then this patch BREAKS your setup. ### Workarounds Do not use eventlet.wsgi facing untrusted clients. ### References - Patch https://github.com/eventlet/eventlet/pull/1062 - This issue is similar to https://github.com/advisories/GHSA-9548-qrrj-x5pj
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2025-58068US | critical9.1 | — | ||
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 t… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/eventlet/eventletPACKAGE
- https://github.com/eventlet/eventlet/commit/0bfebd1117d392559e25b4bfbfcc941754de88fbWEB
- https://github.com/eventlet/eventlet/pull/1062WEB
- https://github.com/eventlet/eventlet/security/advisories/GHSA-hw6f-rjfj-j7j7WEB
- https://lists.debian.org/debian-lts-announce/2025/09/msg00003.htmlWEB
- https://nvd.nist.gov/vuln/detail/CVE-2025-58068ADVISORY
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