CVE-2026-5271
CVE-2026-5271 is a high-severity vulnerability in Python Pymanager with a CVSS 3.x base score of 7.8. 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-427.
Key facts
- Severity: High (CVSS 3.x base score 7.8)
- CVSS v4: 5.6
- EPSS exploit prediction: 0% (7th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-17911
- Weakness: CWE-427
- Affected product: Python Pymanager
- Published:
- Last modified:
Description
pymanager included the current working directory in sys.path meaning modules could be shadowed by modules in the current working directory. As a result, if a user executes a pymanager-generated command (e.g., pip, pytest) from an attacker-controlled directory, a malicious module in that directory can be imported and executed instead of the intended package.
Frequently asked questions
- What is CVE-2026-5271?
- pymanager included the current working directory in sys.path meaning modules could be shadowed by modules in the current working directory. As a result, if a user executes a pymanager-generated command (e.g., pip, pytest) from an attacker-controlled directory, a malicious module in that directory can be imported and executed instead of the intended package.
- How severe is CVE-2026-5271?
- CVE-2026-5271 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-5271 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-5271?
- CVE-2026-5271 affects Python Pymanager. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-5271?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-5271 have an EU (EUVD) identifier?
- Yes. CVE-2026-5271 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17911.
- When was CVE-2026-5271 published?
- CVE-2026-5271 was published on 2026-04-01 and last updated on 2026-06-17.
References
- https://github.com/python/pymanager/security/advisories/GHSA-jr5x-hgm4-rrm6
- http://www.openwall.com/lists/oss-security/2026/04/01/5
Affected products (1)
- cpe:2.3:a:python:pymanager:26.0:*:*:*:*:*:*:*
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