What’s Vulnerable › Vulnerabilities

CVE-2021-4110: NULL Pointer Dereference in mruby/mruby

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-12-15 · updated 2026-06-17
• Weakness: CWE-476

Description

mruby is vulnerable to NULL Pointer Dereference

Affected products

• mruby/mruby: before 3.1 — fixed in 3.1

How to fix

Upgrade to a fixed version: mruby/mruby 3.1. Check the vendor advisory for mitigations.

References

• https://github.com/mruby/mruby/commit/f5e10c5a79a17939af763b1dcf5232ce47e24a34
• https://huntr.dev/bounties/4ce5dc47-2512-4c87-8609-453adc8cad20
• https://github.com/mruby/mruby/commit/f5e10c5a79a17939af763b1dcf5232ce47e24a34
• https://huntr.dev/bounties/4ce5dc47-2512-4c87-8609-453adc8cad20

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