Medium 6.3Published Aug 29, 2025

CVE-2025-58068Eventlet affected by HTTP request smuggling in unparsed trailers

Updated under an hour ago (Oct 27, 2026, 8:40 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for eventlet

Exploited in the last 30 days

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.

CVSS: 6.3 MEDIUM (v4.0, CNA)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
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Modified
Record last updated: Nov 3, 2025
First seen by InfoSec Signals: Oct 19, 2026

Affected products

Affected products

eventlet eventlet eventlet:eventlet (from the name)	before 0.40.3	CNA record
eventlet eventlet eventlet:eventlet	before 0.40.3	NVD

References

References

https://github.com/eventlet/eventlet/security/advisories/GHSA-hw6f-rjfj-j7j7	x-refsource-confirm, vendor-advisory
https://github.com/eventlet/eventlet/pull/1062	x-refsource-misc, issue-tracking
https://github.com/eventlet/eventlet/commit/0bfebd1117d392559e25b4bfbfcc941754de88fb	x-refsource-misc, patch
https://lists.debian.org/debian-lts-announce/2025/09/msg00003.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.