Description
The init_copy function in kernel.c in mruby 1.4.1 makes initialize_copy calls for TT_ICLASS objects, which allows attackers to cause a denial of service (mrb_hash_keys uninitialized pointer and application crash) or possibly have unspecified other impact.
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 | 1.4.1+20180622+git640fca32-1 | — |
| Debian 13 | mruby | 1.4.1+20180622+git640fca32-1 | — |
| Debian 12 | mruby | 1.4.1+20180622+git640fca32-1 | — |
| 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 | — |
Advisories 1
- DLA-2996-1 mruby - security update Debian Security (DSA / DLA) · Mar 9, 2026