CVE-2026-86943
Apple Macos: memory corruption
- Risk score
- 59/100
- CVSS
- 7.5 v3.1
- Exploit chance (30 days)
- 0.5%
- Published
- 26 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- The issue was addressed with improved memory handling. This issue is fixed in macOS Golden Gate 27.2. A remote attacker may be able to cause a denial-of-service.
- Affected
- Apple Macos
- Fix
- Apply the vendor's security update; see the linked advisory.
- Exploitation
- No known exploitation
Story map
At a glance
Apple Macos: Red, act today. An authentication issue was addressed with improved state management. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.7.9, macOS Sonoma 14.8.9, macOS Tahoe 26.6.1, macOS Tahoe 26.7. An attacker on the network may be able to authenticate to Screen Sharing without valid credentials.
The flaws
- CVE-2026-86943: Memory corruption (CVSS 7.5 · EPSS 1%)
- CVE-2026-65400: Apple macOS Improper Authentication Vulnerability (CVSS 9.8 · exploited)
- CVE-2026-112526: Buffer overflow (CVSS 9.8 · EPSS 1%)
- CVE-2026-86868: Authentication bypass (CVSS 9.1 · EPSS 0%)
The fix
Fix: Apply the vendor's security update; see the linked advisory.
Who is exposed: Apple Macos
Where it stands
- Exploited in the wild
- On CISA's exploited list since 18 Aug
- US federal deadline 21 Aug
How it unfolded
- 18 Aug, CISA (official): Added to the Known Exploited Vulnerabilities list
- 21 Aug, Deadline (official): US federal agencies must have patched
Connects to
- Same weakness: Memory corruption (CWE-119). 341 other warnings in 30 days
- Same product: Earlier Apple Macos warnings. 120 in the last 90 days
Why it is Yellow
- CVSS 7.5 high
- Remotely exploitable without logging in
References
Original description
The issue was addressed with improved memory handling. This issue is fixed in macOS Golden Gate 27.2. A remote attacker may be able to cause a denial-of-service.
Last activity 26 Oct 2026. Patch Forecast updates every hour.