Medium severity6.2NVD Advisory· Published Sep 9, 2026

CVE-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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Mrubyc/Mrubycllm-fuzzy2 versions
<=4.0.0+ 1 more
- (no CPE)range: <=4.0.0
- (no CPE)

Patches

Vulnerability mechanics

References

github.com/mrubyc/mrubyc/blob/4261cf5e5ae5579e3110dab98a04b91c7d919429/src/vm.cnvd
github.com/mrubyc/mrubyc/blob/release4.0.0/src/vm.cnvd
www.vulncheck.com/advisories/mrubyc-through-4.0.0-null-pointer-dereference-via-op-enternvd

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