What’s Vulnerable › Vulnerabilities

CVE-2020-15866

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-07-21 · updated 2026-06-17
• Weakness: CWE-787

Description

mruby through 2.1.2-rc has a heap-based buffer overflow in the mrb_yield_with_class function in vm.c because of incorrect VM stack handling. It can be triggered via the stack_copy function.

Affected products

• Debian Linux: 9.0
• mruby/mruby: through 2.1.1; 2.1.2-rc

References

• https://github.com/mruby/mruby/issues/5042
• https://lists.debian.org/debian-lts-announce/2022/05/msg00006.html
• https://github.com/mruby/mruby/issues/5042
• https://lists.debian.org/debian-lts-announce/2022/05/msg00006.html

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