Know every vulnerabilitybefore it knows you.
DevGuard continuously monitors your dependencies and alerts you when CVEs like this one affect your stack — with real-time threat intelligence built for developers.
PYSEC-2026-1350
No affected components available
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
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
Browse More
Continuously monitor your dependencies and get alerted when vulnerabilities like this one affect your stack.
Checkout DevGuard