# OSV-2021-1217: Heap-use-after-free in ZEND_FETCH_OBJ_R_SPEC_CV_CONST_INLINE_HANDLER

> A heap-use-after-free vulnerability in the PHP interpreter allows attackers to cause a crash or potentially execute arbitrary code.

- **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:** 10 Sep 2021

## What is OSV-2021-1217?

OSV-2021-1217 is an use after free vulnerability in php, published on 10 Sep 2021. 

### Official description

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=38297

```
Crash type: Heap-use-after-free READ 8
Crash state:
ZEND_FETCH_OBJ_R_SPEC_CV_CONST_INLINE_HANDLER
ZEND_FETCH_OBJ_R_SPEC_CV_CONST_HANDLER
fuzzer_execute_ex
```

## Which versions are affected by OSV-2021-1217?

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


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

## How do I fix OSV-2021-1217?

No fix has been published for OSV-2021-1217 yet. Limit exposure of the affected software until one is available.

## Is OSV-2021-1217 being exploited?

There is no known exploitation of OSV-2021-1217 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for OSV-2021-1217 and fix it if it is affected.

What it is: OSV-2021-1217 is an use after free vulnerability in php, published on 10 Sep 2021. 
Exploitation: There is no known exploitation of OSV-2021-1217 in the wild and no public exploit code.

Affected packages and fixed versions:
- php (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-2021-1217/ (Markdown: https://insights.sbomify.com/OSV-2021-1217/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/OSV-2021-1217

---
From sbomify Insights: https://insights.sbomify.com/OSV-2021-1217/
Summaries are generated and may contain mistakes; the official description above is the record.