CVE-2026-43748: An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Sequoia 15.7.8, macOS Tahoe 26.6. An app may be able to cause unexpected syst

criticalCVSS 9.8CVE-2026-43748

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Sequoia 15.7.8, macOS Tahoe 26.6. An app may be able to cause unexpected system termination.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: critical — CVSS 9.8
Published: 2026-07-27
Last updated: 2026-07-28
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-43748

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-437480.36% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 28% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-43748	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[NEW] [high] Apple macOS (Tahoe, Sonoma, and Sequoia): Multiple vulnerabilitiescert-bund
unknownNCSC-2026-0267 [1.00] [M/H] Vulnerabilities fixed in Apple MacOSncsc-nl

Recent advisories for An out-of-bounds write

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

mediumCVE-2026-17264: Opening a crafted DICOM file containing malicious JPEG-compressed pixel data triggers an attac…nvd · 2026-08-07
highCVE-2026-8325: A maliciously crafted PDF file, when parsed through Autodesk Revit, can force an Out-of-Bounds …nvd · 2026-08-06
highCVE-2026-70632: FFmpeg versions from 4.4 up to, but not including, 9.0 contain an out-of-bounds heap write vul…nvd · 2026-08-06
mediumCVE-2026-43630: llama.cpp builds b5702 through b7653 contain an out-of-bounds read vulnerability in the recurr…nvd · 2026-08-06
criticalCVE-2026-71256: nanoMODBUS through v1.23.0 contains an out-of-bounds stack read leading to a wild-pointer writ…nvd · 2026-08-05
highCVE-2026-71255: nanoMODBUS through v1.23.0 contains an out-of-bounds write in the Modbus client-side recv_read…nvd · 2026-08-05