CVE-2024-9287
HIGHDescription
A vulnerability has been found in the CPython `venv` module and CLI where path names provided when creating a virtual environment were not quoted properly, allowing the creator to inject commands into virtual environment "activation" scripts (ie "source venv/bin/activate"). This means that attacker-controlled virtual environments are able to run commands when the virtual environment is activated. Virtual environments which are not created by an attacker or which aren't activated before being used (ie "./venv/bin/python") are not affected.
How to fix
This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.
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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploit Intelligence
Moderate risk: more likely to be exploited than 48% of all known CVEs.
References
Related Vulnerabilities
Other CWE-428 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2023-38408 | Critical | 9.8 | 80% | - | Fix |
| CVE-2020-15261 | High | 8.0 | 11% | - | Fix |
| CVE-2017-13993 | High | 7.8 | 2.6% | - | - |
| CVE-2018-10619 | High | 7.8 | 2.6% | - | Fix |
| CVE-2019-17658 | Critical | 9.8 | 2.2% | - | - |
| CVE-2015-4173 | Medium | 6.9 | 2.1% | - | Fix |
Common questions
How do I fix CVE-2024-9287?
Published advisories record a fix for 310 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.
Is CVE-2024-9287 being actively exploited?
Not that we know of. CVE-2024-9287 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.65% is the estimated probability that it will be exploited in the next 30 days. That is higher than 48% of all scored CVEs.
How severe is CVE-2024-9287?
CVE-2024-9287 has a CVSS v3 base score of 7.8, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2024-9287 affect?
Published advisories record a fix for pypy3 (Debian), Cython-0:0.29.21 (Rocky), Cython-0:0.29.21 (Red Hat / RHEL), Cython-debugsource-0:0.29.21 (Red Hat / RHEL), and 306 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-03.