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CVE-2024-8946 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CNA: [email protected]CVSS-B:7.3 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/micropython/micropython/commit/29943546343c92334e8518695a11fc0e2ceea68b	[email protected]	Patch
https://github.com/micropython/micropython/issues/13006	[email protected]	ExploitIssue Tracking
https://github.com/micropython/micropython/issues/13006#issuecomment-1820309455	[email protected]	ExploitThird Party Advisory
https://vuldb.com/?ctiid.277764	[email protected]	Permissions Required
https://vuldb.com/?id.277764	[email protected]	Third Party Advisory
https://vuldb.com/?submit.409312	[email protected]	Third Party Advisory

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-787	Out-of-bounds Write	[email protected]
CWE-122	Heap-based Buffer Overflow	[email protected]

Affected Products

Product	Versions
micropython micropython	1.23.0
CPE cpe:2.3:a:micropython:micropython:1.23.0:::::::* Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Sep 24, 2024	Initial Analysis	[email protected]
Sep 17, 2024	New CVE Received	[email protected]