CVE-2026-84538 Denial of service in macOS
A remote attacker can cause a denial-of-service in macOS due to insufficient input validation, requiring users to apply the latest security patches.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-84538?
CVE-2026-84538 is a medium-severity denial of service vulnerability in Apple Macos, published on 14 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
A denial-of-service issue was addressed with improved input validation. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. A remote attacker may be able to cause a denial-of-service.
Weakness: CWE-20
Which versions are affected by CVE-2026-84538?
It affects 1 product.
Products include Apple Macos.
How do I fix CVE-2026-84538?
No fix has been published for CVE-2026-84538 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-2026-84538 being exploited?
There is no known exploitation of CVE-2026-84538 in the wild and no public exploit code.
Other vulnerabilities in Apple Macos
Sources
Also known as GHSA-v8vw-99xx-6pjx.