# CVE-2026-43666: Memory corruption in iOS and iPadOS

> A local network attacker can cause a denial-of-service via an out-of-bounds write in Apple operating systems.

- **Severity:** Medium 6.2 (`CVSS:3.1/AV:L/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:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 May 2026
- **Updated:** 12 May 2026
- **Also known as:** GHSA-cm8r-x63q-3wvp

## What is CVE-2026-43666?

CVE-2026-43666 is a medium-severity memory corruption vulnerability in Apple Ipados, published on 11 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 18.7.9 and iPadOS 18.7.9, iOS 26.5 and iPadOS 26.5, macOS Sequoia 15.7.7, macOS Sonoma 14.8.7, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, watchOS 26.5. An attacker on the local network may be able to cause a denial-of-service.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2026-43666?

It affects 6 products.


Products: Apple Ipados, Apple Iphone Os, Apple Macos, Apple Tvos, Apple Visionos, Apple Watchos.

## How do I fix CVE-2026-43666?

No fix has been published for CVE-2026-43666 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-43666 being exploited?

There is no known exploitation of CVE-2026-43666 in the wild and no public exploit code.

## Other vulnerabilities in Apple Ipados

- [CVE-2025-43300](https://insights.sbomify.com/CVE-2025-43300/): Apple iOS, iPadOS, and macOS Out-of-Bounds Write (critical 10.0, exploited in the wild)
- [CVE-2025-24201](https://insights.sbomify.com/CVE-2025-24201/): Apple Multiple Products WebKit Out-of-Bounds Write (critical 10.0, exploited in the wild)
- [CVE-2025-24085](https://insights.sbomify.com/CVE-2025-24085/): Apple Multiple Products Use-After-Free (critical 10.0, exploited in the wild)
- [CVE-2025-31200](https://insights.sbomify.com/CVE-2025-31200/): Apple Multiple Products Memory Corruption (critical 9.8, exploited in the wild)
- [CVE-2025-31201](https://insights.sbomify.com/CVE-2025-31201/): Apple Multiple Products Arbitrary Read and Write (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-43666 and fix it if it is affected.

What it is: CVE-2026-43666 is a medium-severity memory corruption vulnerability in Apple Ipados, published on 11 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-43666 in the wild and no public exploit code.

Affected product: Apple Ipados. 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-2026-43666/ (Markdown: https://insights.sbomify.com/CVE-2026-43666/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-43666
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-43666
- OSV: https://osv.dev/vulnerability/CVE-2026-43666

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-43666/
Summaries are generated and may contain mistakes; the official description above is the record.