# CVE-2026-43790 — Apple macOS

> As of 2026-11-06, CVE-2026-43790 is a CRITICAL-severity vulnerability in Apple macOS, CVSS v3.1 9.1, EPSS 0.7% (54.6th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-43790, most recently “Apple September 2026 Security Updates: 273 CVEs incl. actively exploited Screen Sharing auth bypass (CVE-2026-65400) and critical Bluetooth RCE (CVE-2026-65414)”.

**Last updated:** 2026-10-26

## What is CVE-2026-43790?

The issue was addressed with improved memory handling. 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 unexpected system termination or corrupt kernel memory.

The record classifies CVE-2026-43790 under weakness class [CWE-787](https://intel.threadlinqs.com/cwe/CWE-787). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 53 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.1 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H`)
- **EPSS (FIRST):** 0.7% probability of exploitation in the next 30 days, higher than 54.6% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 6.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-14, last modified 2026-10-26

## Is CVE-2026-43790 being exploited?

It currently carries a trending score of 35 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Apple](https://intel.threadlinqs.com/vendors/apple): macOS

## How to fix CVE-2026-43790

Vendor advisory: [https://support.apple.com/en-us/149035](https://support.apple.com/en-us/149035). Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

## Threat activity tracking CVE-2026-43790

1 tracked threat in the Threadlinqs corpus references CVE-2026-43790, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Apple September 2026 Security Updates: 273 CVEs incl. actively exploited Screen Sharing auth bypass (CVE-2026-65400) and critical Bluetooth RCE (CVE-2026-65414)](https://intel.threadlinqs.com/threat/TL-2026-5385) — CRITICAL · 2026-11-06

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-11-06. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [support.apple.com](https://support.apple.com/en-us/149035)
- [support.apple.com (149042)](https://support.apple.com/en-us/149042)
- [support.apple.com (149043)](https://support.apple.com/en-us/149043)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-43790
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