Apple Multiple Products Out-of-Bounds Write Vulnerability
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 o
What happened
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.
CISA lists it as exploited, added 29 Sep 2026.
Does it affect you
Names Apple macOS. Enter the product and version you run to place it against the affected range the vendor published.
What to do
- Follow the vendor advisory for the fixed release and any interim mitigation.
support.apple.com - Follow the vendor advisory for the fixed release and any interim mitigation.
support.apple.com - Follow the vendor advisory for the fixed release and any interim mitigation.
support.apple.com - 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.
cisa.gov
CISA’s notes for this entry:
- support.apple.com/en-us/149226
- support.apple.com/en-us/149228
- support.apple.com/en-us/149229
- BOD 26-04: cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
- Forensics Triage Requirements: cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
- nvd.nist.gov/vuln/detail/CVE-2026-86950
Affected, as published to NVD
- macos
- Apple macOS: everything below 15.8.1
The record
- NVD status
- Analyzed
- Published
- 28 Sep 2026, last modified 30 Sep 2026 (NVD)
- Severity
- CVSS 3.1 base score 8.8, High — computed here from the vector; NVD states 8.8.
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness
- CWE-787 Out-of-bounds Write (NVD; names by MITRE)
- Exploitation
- Listed in CISA’s Known Exploited Vulnerabilities catalogue since 29 Sep 2026; federal remediation due 02 Oct 2026. CISA entry
- Exploit probability
- EPSS 0.8%, 55th percentile — FIRST, scored 29 Sep 2026. FIRST EPSS
- Vendor
- Apple · Multiple Products (CISA)
References on the NVD record
- support.apple.com/en-us/149226Release NotesVendor Advisory
- support.apple.com/en-us/149228Release NotesVendor Advisory
- support.apple.com/en-us/149229Release NotesVendor Advisory
- seclists.org/fulldisclosure/2026/Sep/89Mailing ListThird Party Advisory
- seclists.org/fulldisclosure/2026/Sep/90Mailing ListThird Party Advisory
- seclists.org/fulldisclosure/2026/Sep/91Mailing ListThird Party Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-86950US Government Resource
Reporting that names this identifier
- CISA Adds One Known Exploited Vulnerability to Catalog — CISA, 21 hr ago
- Apple squashes zero-day bug exploited in “extremely sophisticated” attack (CVE-2026-86950) — Help Net Security, 23 hr ago
- Apple Patches Meta-Reported Zero-Day Linked to ‘Extremely Sophisticated Attack’ — SecurityWeek, 1 d ago
- Apple Patches CoreGraphics Flaw Possibly Exploited in Targeted Attacks — The Hacker News, 2 d ago
Sources
The verdict above is computed from the products and versions you entered and the affected ranges the vendor published to NVD. It does not inspect your environment, and this site never reports a product as unaffected: why.