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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | mruby | 2.1.2-1 | — |
| Debian 13 | mruby | 2.1.2-1 | — |
| Debian 12 | mruby | 2.1.2-1 | — |
| Debian 9 | mruby | 1.2.0+20161228+git30d5424a-1+deb9u1 | DLA-2996-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | mruby | No fix yet | — |
| Ubuntu 26.04 LTS | mruby | No fix yet | — |
| Ubuntu 25.10 | mruby | No fix yet | — |
| Ubuntu 24.04 LTS | mruby | No fix yet | — |
| Ubuntu 22.04 LTS | mruby | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | mruby | No fix yet | — |
| Ubuntu 18.04 LTS | mruby | No fix yet | — |
| Ubuntu 16.04 LTS | mruby | No fix yet | — |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | mruby | 2.1.2-r0 | — |
| Alpine v3.23 | mruby | 2.1.2-r0 | — |
| Alpine v3.22 | mruby | 2.1.2-r0 | — |
| Alpine v3.21 | mruby | 2.1.2-r0 | — |
| Alpine v3.20 | mruby | 2.1.2-r0 | — |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | mruby | 2.1.2-r0 | — |
| Alpine v3.18 | mruby | 2.1.2-r0 | — |
| Alpine v3.17 | mruby | 2.1.2-r0 | — |
| Alpine v3.16 | mruby | 2.1.2-r0 | — |
| Alpine v3.15 | mruby | 2.1.2-r0 | — |
| Alpine v3.14 | mruby | 2.1.2-r0 | — |
| Alpine v3.13 | mruby | 2.1.2-r0 | — |
Advisories 1
- DLA-2996-1 mruby - security update Debian Security (DSA / DLA) · Mar 9, 2026