CVE-2026-34591

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 62% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this weekElevated
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

April 2, 2026

Last Modified

July 24, 2026

Advisory Details (4)

Auto-updated Jul 25, 2026
🔬 Proof of concept available. Patch available. Sources: github_pr, github_release, github, github_commit.
github Patch Available🟡 PoC Available

Wheel Path Traversal Leading to Arbitrary File Write · Advisory · python-poetry/poetry · GitHub

https://github.com/python-poetry/poetry/security/advisories/GHSA-2599-h6xx-hpxp
github_release Patch Available

2.3.3

Patch available: python-poetry/poetry 2.3.3

https://github.com/python-poetry/poetry/releases/tag/2.3.3
github_pr Patch Available

installer: fix path traversal

Patch available: python-poetry/poetry 2.4.0 (PR #10792 merged 2026-03-29)

https://github.com/python-poetry/poetry/pull/10792
github_commit Patch Available

commit ed59537ac370 (python-poetry/poetry)

Patch available: python-poetry/poetry 2.4.0 (contains commit ed59537ac370)

http://github.com/python-poetry/poetry/commit/ed59537ac3709cfbdbf95d957de801c13872991a

Vendor Advisories for CVE-2026-34591(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
poetry1.4.0 ... 2.3.2 (27 versions)2.3.3—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 113 total refreshes for this CVE.

  1. 2026-07-27 14:13 UTCEPSS rescore
  2. 2026-07-26 14:54 UTCEPSS rescore
  3. 2026-07-26 14:54 UTCEPSS rescore
  4. 2026-07-26 09:27 UTCEG score recompute
  5. 2026-07-26 09:27 UTCVendor advisory
  6. 2026-07-25 14:18 UTCEPSS rescore
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  12. 2026-07-23 03:09 UTCEG score recompute
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  19. 2026-07-17 03:24 UTCOSV refresh
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  44. 2026-06-10 22:18 UTCEPSS rescore
  45. 2026-06-10 17:23 UTCVendor advisory
  46. 2026-06-10 13:22 UTCEPSS rescore
  47. 2026-06-09 15:12 UTCVendor advisory
  48. 2026-06-08 14:17 UTCEPSS rescore
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  50. 2026-06-08 13:09 UTCVendor advisory
  51. 2026-06-07 15:25 UTCEPSS rescore
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  53. 2026-06-07 15:25 UTCEPSS rescore
  54. 2026-06-07 11:04 UTCVendor advisory
  55. 2026-06-06 13:47 UTCEPSS rescore
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Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-34591?
CVE-2026-34591 is a medium vulnerability published on April 2, 2026. 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…
When was CVE-2026-34591 disclosed?
CVE-2026-34591 was first published in the National Vulnerability Database on April 2, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34591 actively exploited?
CVE-2026-34591 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 62.1% of all scored CVEs.
What is the CVSS score of CVE-2026-34591?
CVE-2026-34591 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-34591?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34591, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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