# CVE-2025-43526: Security feature bypass in Safari

> Attackers can bypass Lockdown Mode restrictions in Safari on macOS by using file URLs to access restricted Web APIs.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:** 17 Dec 2025
- **Updated:** 2 Apr 2026
- **Also known as:** GHSA-338x-j9c9-2c8v

## What is CVE-2025-43526?

CVE-2025-43526 is a critical vulnerability in Apple Macos, published on 17 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

This issue was addressed with improved URL validation. This issue is fixed in Safari 26.2, macOS Tahoe 26.2. On a Mac with Lockdown Mode enabled, web content opened via a file URL may be able to use Web APIs that should be restricted.

Weakness: CWE-601 (URL Redirection to Untrusted Site)

## Which versions are affected by CVE-2025-43526?

It affects 2 products.


Products: Apple Macos, Apple Safari.

## How do I fix CVE-2025-43526?

No fix has been published for CVE-2025-43526 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-43526 being exploited?

There is no known exploitation of CVE-2025-43526 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-2025-43526 and fix it if it is affected.

What it is: CVE-2025-43526 is a critical vulnerability in Apple Macos, published on 17 Dec 2025. 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-2025-43526 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-2025-43526/ (Markdown: https://insights.sbomify.com/CVE-2025-43526/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-43526
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-43526
- OSV: https://osv.dev/vulnerability/CVE-2025-43526

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-43526/
Summaries are generated and may contain mistakes; the official description above is the record.