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CVE-2026-86547— mrubyc through 4.0.0 NULL Pointer Dereference via OP_ENTER

Quick assessment

Affected
mrubyc mrubyc
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

mruby 4.0.0 及之前的版本存在一个空指针解引用漏洞，该漏洞位于 中的 处理器，在处理不可信字节码时触发。攻击者可以构造包含顶层 指令的恶意 字节码文件，从而导致嵌入该库的应用程序崩溃，造成拒绝服务（DoS）。

CVSS 6.2 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
mrubyc mrubyc 2.0≤ 4.0.0 affected
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I. Basic Information for CVE-2026-86547

Vulnerability Information
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Vulnerability Title
mrubyc through 4.0.0 NULL Pointer Dereference via OP_ENTER
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
mrubyc mrubyc 2.0 ~ 4.0.0 -

II. Public POCs for CVE-2026-86547

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-86547

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Vendor Advisories for CVE-2026-86547 (1)

IV. Related Vulnerabilities

Same product: mrubyc
Same weakness: CWE-476

V. Comments for CVE-2026-86547

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