CVE-2025-58068: Eventlet is a concurrent networking library for Python

Q: How do I fix CVE-2025-58068?

eventlet: upgrade to 0.40.3. Exact commands for each OS are on this page.

Q: Is CVE-2025-58068 being exploited?

CVE-2025-58068 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-58068 affect?

CVE-2025-58068 affects eventlet. Severity is critical (CVSS 9.1). 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 trailer sections. This vulnerability could enable attackers t

Q: How urgent is CVE-2025-58068?

Priority 45/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.1REMOTEUPGRADE

CVE-2025-58068 is a critical-severity flaw (CVSS 9.1) affecting eventlet. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Weakness	CWE-444
Published	2025-08-29
Last modified	2026-10-19

Publisher (CNA): GitHub, Inc. · Vendor: eventlet

Last updated 2026-10-19 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-08-29 22:15 UTCPublished CVE record published
2026-10-19 17:10 UTCUpdated Record last modified

eventlet eventlet UPGRADE

Affected: < 0.40.3

Fixed in: 0.40.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy eventlet || rpm -q eventlet || eventlet --version

2. UPGRADE to 0.40.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade eventlet

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade eventlet

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-58068?

eventlet: upgrade to 0.40.3. Exact commands for each OS are on this page.

Is CVE-2025-58068 being exploited?

CVE-2025-58068 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-58068 affect?

CVE-2025-58068 affects eventlet. Severity is critical (CVSS 9.1). 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 trailer sections. This vulnerability could enable attackers t

How urgent is CVE-2025-58068?

Priority 45/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities

Related CVEs

CVE-2023-29483 HIGH 7.0 UPGRADE UPGRADE eventlet before 0.35.2, as used in dnspython before 2.6.0, allows remote attackers to interfere with DNS name

References

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