# CVE-2025-46687: Memory corruption in QuickJS

> A heap-based buffer overflow in QuickJS allows attackers to execute arbitrary code or cause denial of service via crafted strings.

- **Severity:** Medium 5.6 (`CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 27 Apr 2025
- **Updated:** 28 Apr 2025
- **Also known as:** ALPINE-CVE-2025-46687, DEBIAN-CVE-2025-46687, GHSA-hrc5-3jpv-g9x2, UBUNTU-CVE-2025-46687

## What is CVE-2025-46687?

CVE-2025-46687 is a medium-severity memory corruption vulnerability in QuickJS, published on 27 Apr 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

quickjs-ng through 0.9.0 has a missing length check in JS_ReadString for a string, leading to a heap-based buffer overflow. QuickJS before 2025-04-26 is also affected.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling)

## Which versions are affected by CVE-2025-46687?

It affects 2 products.


Products: Bellard Quickjs, Quickjs-Ng Quickjs.

## How do I fix CVE-2025-46687?

Upgrade to a fixed version.

## Is CVE-2025-46687 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-46687 exists.

## Other vulnerabilities in QuickJS

- [CVE-2025-12745](https://insights.sbomify.com/CVE-2025-12745/): QuickJS quickjs.c js_array_buffer_slice buffer over-read (medium 4.8)
- [CVE-2024-33263](https://insights.sbomify.com/CVE-2024-33263/): Denial of service in n/a (medium 4.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-46687 and fix it if it is affected.

What it is: CVE-2025-46687 is a medium-severity memory corruption vulnerability in QuickJS, published on 27 Apr 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-46687 exists.

Affected product: QuickJS. No package-level version data is available, so check the vendor advisory linked from the reference page.

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/CVE-2025-46687/ (Markdown: https://insights.sbomify.com/CVE-2025-46687/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-46687
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-46687
- OSV: https://osv.dev/vulnerability/CVE-2025-46687

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-46687/
Summaries are generated and may contain mistakes; the official description above is the record.