# OSV-2023-180: UNKNOWN READ in mrb_obj_iv_get

> An unknown read vulnerability in mrb_obj_iv_get can cause a crash, potentially leading to denial of service in applications using the library.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Not stated
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Mar 2023

## What is OSV-2023-180?

OSV-2023-180 is a memory corruption vulnerability in mruby, published on 16 Mar 2023. 

### Official description

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=57051

```
Crash type: UNKNOWN READ
Crash state:
mrb_obj_iv_get
class_name_str
mrb_mod_to_s
```

## Which versions are affected by OSV-2023-180?

1 open source package ship an affected version, including mruby.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `mruby` | OSS-Fuzz | All versions | None |

## How do I fix OSV-2023-180?

No fix has been published for OSV-2023-180 yet. Limit exposure of the affected software until one is available.

## Is OSV-2023-180 being exploited?

There is no known exploitation of OSV-2023-180 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for OSV-2023-180 and fix it if it is affected.

What it is: OSV-2023-180 is a memory corruption vulnerability in mruby, published on 16 Mar 2023. 
Exploitation: There is no known exploitation of OSV-2023-180 in the wild and no public exploit code.

Affected packages and fixed versions:
- mruby (OSS-Fuzz): affected all versions; no fix listed

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/OSV-2023-180/ (Markdown: https://insights.sbomify.com/OSV-2023-180/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/OSV-2023-180

---
From sbomify Insights: https://insights.sbomify.com/OSV-2023-180/
Summaries are generated and may contain mistakes; the official description above is the record.