CVE-2018-10191

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2018-04-17 · updated 2026-06-17
Weakness: CWE-190

Description

In versions of mruby up to and including 1.4.0, an integer overflow exists in src/vm.c::mrb_vm_exec() when handling OP_GETUPVAR in the presence of deep scope nesting, resulting in a use-after-free. An attacker that can cause Ruby code to be run can use this to possibly execute arbitrary code.

Affected products

Debian Linux: 9.0
mruby/mruby: through 1.4.0

References

https://github.com/mruby/mruby/commit/1905091634a6a2925c911484434448e568330626
https://github.com/mruby/mruby/issues/3995
https://lists.debian.org/debian-lts-announce/2022/05/msg00006.html
https://github.com/mruby/mruby/commit/1905091634a6a2925c911484434448e568330626
https://github.com/mruby/mruby/issues/3995
https://lists.debian.org/debian-lts-announce/2022/05/msg00006.html

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