CVE-2026-86547

MediumCVSS 6.2/10Last modified Sep 10, 2026

Description

mrubyc through 4.0.0 contains a null pointer dereference vulnerability in the op_enter() handler in src/vm.c when processing untrusted bytecode. Attackers can craft malicious .mrb bytecode files with OP_ENTER instructions at the top level to crash the embedding application and cause denial of service.

Metrics

CVSS 3.1 6.2/10CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-476

Affected software

No affected versions have been published.

Timeline

Published: Sep 9, 2026
Last modified: Sep 10, 2026
NVD status: Deferred

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