What’s Vulnerable › Vulnerabilities

CVE-2024-8948: MicroPython objint.c mpz_as_bytes 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 rated as critical. Affected by this issue is the function mpz_as_bytes of the file py/objint.c. The manipulation leads to heap-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The patch is identified as 908ab1ceca15ee6fd0ef82ca4cba770a3ec41894. It is recommended to apply a patch to fix this issue. In micropython objint component, converting zero from int to bytes leads to heap buffer-overflow-write at mpz_as_bytes.

Affected products

• MicroPython: 1.23.0

References

• https://github.com/micropython/micropython/commit/908ab1ceca15ee6fd0ef82ca4cba770a3ec41894
• https://github.com/micropython/micropython/issues/13041
• https://vuldb.com/?ctiid.277766
• https://vuldb.com/?id.277766
• https://vuldb.com/?submit.409317

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