CVE-2026-43747 Denial of service in macOS
An out-of-bounds read in macOS allows attackers to cause unexpected application termination by crafting a malicious file.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-43747?
CVE-2026-43747 is a high-severity denial of service vulnerability in Apple Macos, published on 27 Jul 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. Parsing a maliciously crafted file may lead to an unexpected app termination.
Weakness: CWE-125
Which versions are affected by CVE-2026-43747?
It affects 1 product.
Products include Apple Macos.
How do I fix CVE-2026-43747?
No fix has been published for CVE-2026-43747 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-43747 being exploited?
There is no known exploitation of CVE-2026-43747 in the wild and no public exploit code.
Other vulnerabilities in Apple Macos
Sources
Also known as GHSA-xj44-pxrh-gchm.