What’s Vulnerable › Vulnerabilities

CVE-2024-8946: MicroPython VFS Unmount vfs.c mp_vfs_umount heap-based overflow

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2024-09-17 · updated 2026-06-17
• Weakness: CWE-122

Description

A vulnerability was found in MicroPython 1.23.0. It has been classified as critical. Affected is the function mp_vfs_umount of the file extmod/vfs.c of the component VFS Unmount Handler. The manipulation leads to heap-based buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. The name of the patch is 29943546343c92334e8518695a11fc0e2ceea68b. It is recommended to apply a patch to fix this issue. In the VFS unmount process, the comparison between the mounted path string and the unmount requested string is based solely on the length of the unmount string, which can lead to a heap buffer overflow read.

Affected products

• MicroPython: 1.23.0

References

• https://github.com/micropython/micropython/commit/29943546343c92334e8518695a11fc0e2ceea68b
• https://github.com/micropython/micropython/issues/13006
• https://github.com/micropython/micropython/issues/13006#issuecomment-1820309455
• https://vuldb.com/?ctiid.277764
• https://vuldb.com/?id.277764
• https://vuldb.com/?submit.409312

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