Description
Out-of-bounds Read in mrb_obj_is_kind_of in in GitHub repository mruby/mruby prior to 3.2. # Impact: Possible arbitrary code execution if being exploited.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| mruby | mruby/mruby | unspecified – < 3.2 | 3.2 |
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 | 3.1.0-1 | — |
| Debian 13 | mruby | 3.1.0-1 | — |
| Debian 12 | mruby | 3.1.0-1 | — |
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 | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | mruby | 3.1.0-1.1 | openSUSE-SU-2024:12703-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | mruby | 3.1.0-r0 | — |
| Alpine v3.23 | mruby | 3.1.0-r0 | — |
| Alpine v3.22 | mruby | 3.1.0-r0 | — |
| Alpine v3.21 | mruby | 3.1.0-r0 | — |
| Alpine v3.20 | mruby | 3.1.0-r0 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | mruby | 3.1.0-r0 | — |
| Alpine v3.18 | mruby | 3.1.0-r0 | — |
| Alpine v3.17 | mruby | 3.1.0-r0 | — |
Advisories 1
- openSUSE-SU-2024:12703-1 libmruby3_1_0-3.1.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026