CVE-2026-86547
Medium · 6.2CVSS
6.2
EPSS
0.2%
Published
Sep 9, 2026
CISA due date
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The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|
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