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
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | eventlet | < 0.40.3 | 0.40.3 |
References
- https://github.com/eventlet/eventlet/security/advisories/GHSA-hw6f-rjfj-j7j7
- https://nvd.nist.gov/vuln/detail/CVE-2025-58068
- https://github.com/eventlet/eventlet/pull/1062
- https://github.com/eventlet/eventlet/commit/0bfebd1117d392559e25b4bfbfcc941754de88fb
- https://github.com/eventlet/eventlet
- https://lists.debian.org/debian-lts-announce/2025/09/msg00003.html
- https://pypi.org/project/eventlet
- https://github.com/advisories/GHSA-hw6f-rjfj-j7j7
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N- Weakness (CWE)
CWE-444- Platform
- Python (PyPI)
- Package
eventlet- Disclosed
- 29.08.2025
- Updated
- 11.10.2026 13:18
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-1350 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-hw6f-rjfj-j7j7 - CC BY 4.0
Vulnerability history: eventlet
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 3
- First → latest
- 05.2021 08.2025
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Medium 3
Disclosures per year
- 2021: 1
- 2022: 0
- 2023: 0
- 2024: 1
- 2025: 1
- 2026: 0
-
Eventlet affected by HTTP request smuggling in unparsed trailers this entry
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