CVE-2026-86547EPSS p7.2%

CVE-2026-86547CVE-2026-86547

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.

Scoring

CVSS 6.2 ()
VectorCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS0.18% probability of exploitation · percentile 7.2% · 2026-10-05T12:00:23Z
Last modified2026-09-10
Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.