A vulnerability, which was classified as critical, has been found in MicroPython 1.21.0/1.22.0-preview. Affected by this issue is the function poll_set_add_fd of the file extmod/modselect.c. The manip
A vulnerability, which was classified as critical, has been found in MicroPython 1.21.0/1.22.0-preview. Affected by this issue is the function poll_set_add_fd of the file extmod/modselect.c. The manipulation leads to use after free. The exploit has been disclosed to the public and may be used. The patch is identified as 8b24aa36ba978eafc6114b6798b47b7bfecdca26. It is recommended to apply a patch to fix this issue. VDB-249158 is the identifier assigned to this vulnerability.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | micropython-copy | all versions | no fix |
| Python (PyPI) | micropython-io | all versions | no fix |
| Python (PyPI) | micropython-os | all versions | no fix |
| Python (PyPI) | micropython-select | all versions | no fix |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
-- Platform
- Python (PyPI)
- Package
micropython-copy, micropython-io, micropython-os- Disclosed
- 29.12.2023
- Updated
- 11.10.2026 11:19
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2023-256 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2023-257 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2023-258 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2023-259 - PyPA Advisory Database; CC BY 4.0
Vulnerability history: micropython-os
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 12.2023 09.2024
- Without a fix
- 2
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 1
Disclosures per year
- 2023: 1
- 2024: 1
- 2025: 0
- 2026: 0
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A vulnerability, which was classified as critical, has been found in MicroPython 1.21.0/1.22.0-preview. Affected by this issue is the function poll_set_add_fd of the file extmod/modselect.c. The manip this entry
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