Eventlet affected by HTTP request smuggling in unparsed trailers

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

6.3 · 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 · score source

EPSS

• CVE-2025-58068: 0.42% estimated exploitation activity in the next 30 days; percentile 36.37 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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

Published by the source

29 Aug 2025, 20:08 UTC

Last modified by the source

7 Jul 2026, 17:56 UTC

Source last checked

26 Oct 2026, 13:35 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-hw6f-rjfj-j7j7

2. Revision 2 · amended · 25 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-hw6f-rjfj-j7j7

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# Patch Next advisory brief: CVE-2025-58068

Advisory: Eventlet affected by HTTP request smuggling in unparsed trailers
IDs: CVE-2025-58068, GHSA-hw6f-rjfj-j7j7
Record: https://patchnext.com/advisories/cve-2025-58068 (revision 3, source checked 26 Oct 2026, 13:35 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: eventlet 0.40.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI eventlet: affected < 0.40.3; fixed in 0.40.3

## Suggested inspection (read-only)
- `python -m pip show eventlet`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on eventlet.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-hw6f-rjfj-j7j7 (OSV record GHSA-hw6f-rjfj-j7j7 lists affected ranges: PyPI eventlet >=0 <0.40.3 (fixed))
- Verified: https://github.com/advisories/GHSA-hw6f-rjfj-j7j7 (GitHub-reviewed advisory GHSA-hw6f-rjfj-j7j7 lists affected ranges: PyPI eventlet >=0 <0.40.3)

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