Exploited. On CISA's list since 2026-09-29.

Apple Multiple Products Out-of-Bounds Write Vulnerability

CVE-2026-86950 · Apple Multiple Products · Published 2026-09-28

How bad would it be?

8.8 out of 10

CVSS rates it high.

How likely is it to be used?

26%

Estimated chance of exploitation in the next 30 days, higher than 97% of all scored flaws (EPSS, 2026-10-29).

Is it already being used?

Yes

CISA has seen it exploited in real attacks. For US government agencies the fix is deadline passed 17 days ago (2026-10-13).

What CISA says to do

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Apple iOS, macOS, and iPadOS contain an out-of-bounds write vulnerability in CoreGraphics that may lead to arbitrary code execution.

What the flaw is

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 26.7.1 and iPadOS 26.7.1, macOS Sequoia 15.8.1, macOS Tahoe 26.7.1. Processing a maliciously crafted file may lead to arbitrary code execution. Apple is aware of a report that this issue may have been exploited in an extremely sophisticated attack against specific targeted individuals on versions of iOS before iOS 27.

From the NVD.

Fixes and advisories

support.apple.comVendor Advisory
support.apple.comVendor Advisory
support.apple.comVendor Advisory

Learn this

Explore this week’s weaknesses and all learning topics

Understand the kind of weakness behind this flaw. These resources teach the weakness, rather than reproduce this specific CVE. Follow the vendor's advice above to fix the affected product.

Out-of-bounds write

A program writes outside the memory region it is allowed to use.

CWE-787 · CISA KEV; NVD record: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Video course · Free course. C programming and memory concepts are useful; covers several weakness types.

Watch the course at OpenSecurityTraining2 How it is prevented

CWE is a catalogue of weakness types. Labels come from the sources shown and can differ or change. Resource matches reviewed 16 October 2026.

On SentryFeed

Apple Backports Fix for Exploited CoreGraphics Flaw to Older iPhones and iPadsThe Hacker News · 2026-10-27
Apple CoreGraphics PoC Emerges as WhatsApp PDF Checks Hint at Possible Delivery PathThe Hacker News · 2026-10-01
Apple Zero-Day Vulnerability Weaponized in Targeted AttacksDark Reading · 2026-09-29

Exploited flaws from CISA's KEV catalogue. Chance of exploitation from EPSS by FIRST. Descriptions and scores from the NVD. This product uses the NVD API but is not endorsed or certified by the NVD.