# OSV-2025-230: Heap-buffer-overflow in wasm_loader_prepare_bytecode

> A heap buffer overflow in the WebAssembly loader allows attackers to execute arbitrary code or cause denial of service via crafted bytecode.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 22 Mar 2025

## What is OSV-2025-230?

OSV-2025-230 is a memory corruption vulnerability in wamr, published on 22 Mar 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=404921047

```
Crash type: Heap-buffer-overflow WRITE 8
Crash state:
wasm_loader_prepare_bytecode
load_from_sections
wasm_loader_load
```

## Which versions are affected by OSV-2025-230?

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


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

## How do I fix OSV-2025-230?

No fix has been published for OSV-2025-230 yet. Limit exposure of the affected software until one is available.

## Is OSV-2025-230 being exploited?

There is no known exploitation of OSV-2025-230 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for OSV-2025-230 and fix it if it is affected.

What it is: OSV-2025-230 is a memory corruption vulnerability in wamr, published on 22 Mar 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of OSV-2025-230 in the wild and no public exploit code.

Affected packages and fixed versions:
- wamr (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-2025-230/ (Markdown: https://insights.sbomify.com/OSV-2025-230/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/OSV-2025-230

---
From sbomify Insights: https://insights.sbomify.com/OSV-2025-230/
Summaries are generated and may contain mistakes; the official description above is the record.