# OSV-2021-312: Heap-use-after-free in sampled_data_continue

> A heap-use-after-free vulnerability in Ghostscript allows attackers to potentially execute arbitrary code or cause a denial of service via crafted input.

- **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:** 8 Feb 2021

## What is OSV-2021-312?

OSV-2021-312 is an use after free vulnerability in ghostscript, published on 8 Feb 2021. 

### Official description

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=30487

```
Crash type: Heap-use-after-free WRITE 4
Crash state:
sampled_data_continue
gs_interpret
gs_main_run_string_with_length
```

## Which versions are affected by OSV-2021-312?

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


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

## How do I fix OSV-2021-312?

No fix has been published for OSV-2021-312 yet. Limit exposure of the affected software until one is available.

## Is OSV-2021-312 being exploited?

There is no known exploitation of OSV-2021-312 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for OSV-2021-312 and fix it if it is affected.

What it is: OSV-2021-312 is an use after free vulnerability in ghostscript, published on 8 Feb 2021. 
Exploitation: There is no known exploitation of OSV-2021-312 in the wild and no public exploit code.

Affected packages and fixed versions:
- ghostscript (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-2021-312/ (Markdown: https://insights.sbomify.com/OSV-2021-312/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/OSV-2021-312

---
From sbomify Insights: https://insights.sbomify.com/OSV-2021-312/
Summaries are generated and may contain mistakes; the official description above is the record.