# CVE-2024-40803: Memory corruption in macOS

> An attacker can cause unexpected app termination in macOS due to a type confusion issue, requiring a system update.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Jul 2024
- **Updated:** 2 Apr 2026
- **Also known as:** GHSA-fmmj-2f3w-98j5

## What is CVE-2024-40803?

CVE-2024-40803 is a high-severity memory corruption vulnerability in Apple Macos, published on 29 Jul 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A type confusion issue was addressed with improved checks. This issue is fixed in macOS Monterey 12.7.6, macOS Sonoma 14.6, macOS Ventura 13.6.8. An attacker may be able to cause unexpected app termination.

Weakness: CWE-843 (Access of Resource Using Incompatible Type)

## Which versions are affected by CVE-2024-40803?

It affects 1 product.


Products: Apple Macos.

## How do I fix CVE-2024-40803?

No fix has been published for CVE-2024-40803 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-40803 being exploited?

There is no known exploitation of CVE-2024-40803 in the wild and no public exploit code.

## Other vulnerabilities in Apple Macos

- [CVE-2026-65400](https://insights.sbomify.com/CVE-2026-65400/): Apple macOS Improper Authentication (critical 9.8, exploited in the wild)
- [CVE-2024-44146](https://insights.sbomify.com/CVE-2024-44146/): Security feature bypass in macOS (critical 10.0)
- [CVE-2024-44148](https://insights.sbomify.com/CVE-2024-44148/): Security feature bypass in macOS (critical 10.0)
- [CVE-2023-38586](https://insights.sbomify.com/CVE-2023-38586/): Security feature bypass in macOS (critical 10.0)
- [CVE-2023-40455](https://insights.sbomify.com/CVE-2023-40455/): Security feature bypass in macOS (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-40803 and fix it if it is affected.

What it is: CVE-2024-40803 is a high-severity memory corruption vulnerability in Apple Macos, published on 29 Jul 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-40803 in the wild and no public exploit code.

Affected product: Apple Macos. 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-2024-40803/ (Markdown: https://insights.sbomify.com/CVE-2024-40803/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-40803
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-40803
- OSV: https://osv.dev/vulnerability/CVE-2024-40803

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-40803/
Summaries are generated and may contain mistakes; the official description above is the record.