CVE-2026-84536 Integer overflow in macOS
An integer underflow in the macOS SMB client allows a malicious server to cause unexpected system termination, requiring a security patch.
- 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-2026-84536?
CVE-2026-84536 is a medium-severity 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
An integer underflow was addressed with improved input validation. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. Connecting to a malicious SMB server may lead to unexpected system termination.
Weakness: CWE-190
Which versions are affected by CVE-2026-84536?
It affects 1 product.
Products include Apple Macos.
How do I fix CVE-2026-84536?
No fix has been published for CVE-2026-84536 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-84536 being exploited?
There is no known exploitation of CVE-2026-84536 in the wild and no public exploit code.
Other vulnerabilities in Apple Macos
Sources
Also known as GHSA-p25j-8fhv-9wgh.