CVE-2026-34591: Poetry is a dependency manager for Python

Q: How do I fix CVE-2026-34591?

poetry: upgrade to 2.3.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-34591 being exploited?

CVE-2026-34591 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-2026-34591 affect?

CVE-2026-34591 affects poetry. Severity is medium (CVSS 6.5). Poetry is a dependency manager for Python. From version 1.4.0 to before version 2.3.3, a crafted wheel can contain ../ paths that Poetry writes to disk without containment checks, allowing arbitrary file write with the privileges of the Poe

Q: How urgent is CVE-2026-34591?

Priority 38/100. Public exploit reference

Routine

MEDIUM 6.5UPGRADE

CVE-2026-34591 is a medium-severity flaw (CVSS 6.5) affecting poetry. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Poetry is a dependency manager for Python. From version 1.4.0 to before version 2.3.3, a crafted wheel can contain ../ paths that Poetry writes to disk without containment checks, allowing arbitrary file write with the privileges of the Poetry process. It is reachable from untrusted package artifacts during normal install flows. (Normally, installing a malicious wheel is not sufficient for execution of malicious code. Malicious code will only be

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-04-02
Last modified	2026-07-24

Publisher (CNA): GitHub, Inc. · Vendor: python-poetry

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-02 18:16 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

python-poetry poetry UPGRADE

Affected: >= 1.4.0 and < 2.3.3

Fixed in: 2.3.3

Safe to downgrade to: a release before 1.4.0

1. Check installed version

pip show poetry

2. UPGRADE to 2.3.3

pip install --upgrade "poetry>=2.3.3"

3. If no update is available yet, DOWNGRADE to a release before 1.4.0

pip index versions poetry pip install "poetry<1.4.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-34591?

poetry: upgrade to 2.3.3. Exact commands for each OS are on this page.

Is CVE-2026-34591 being exploited?

CVE-2026-34591 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-2026-34591 affect?

CVE-2026-34591 affects poetry. Severity is medium (CVSS 6.5). Poetry is a dependency manager for Python. From version 1.4.0 to before version 2.3.3, a crafted wheel can contain ../ paths that Poetry writes to disk without containment checks, allowing arbitrary file write with the privileges of the Poe

How urgent is CVE-2026-34591?

Priority 38/100. Public exploit reference

Software pages

Python vulnerabilities

References

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