How severe is CVE-2026-34591?

CVE-2026-34591 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-34591 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34591?

CVE-2026-34591 affects Python-poetry Poetry. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34591?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-34591 have an EU (EUVD) identifier?

Yes. CVE-2026-34591 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18454.

When was CVE-2026-34591 published?

CVE-2026-34591 was published on 2026-04-02 and last updated on 2026-06-17.

CVE-2026-34591

CVE-2026-34591 is a medium-severity vulnerability in Python-poetry Poetry with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 7.1
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18454
Weakness: CWE-22
Affected product: Python-poetry Poetry
Published: 2026-04-02
Last modified: 2026-06-17

Description

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 executed after installation if the malicious package is imported or invoked by the user.). This issue has been patched in version 2.3.3.

Frequently asked questions

What is CVE-2026-34591?: 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 executed after installation if the malicious package is imported or invoked by the user.). This issue has been patched in version 2.3.3.
How severe is CVE-2026-34591?: CVE-2026-34591 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-34591 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34591?: CVE-2026-34591 affects Python-poetry Poetry. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34591?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-34591 have an EU (EUVD) identifier?: Yes. CVE-2026-34591 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18454.
When was CVE-2026-34591 published?: CVE-2026-34591 was published on 2026-04-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:python-poetry:poetry:*:*:*:*:*:python:*:*

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