How to fix CVE-2026-86950: Apple Multiple Products (exploited in the wild)

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.

• Severity: HIGH (CVSS 3.1 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.
• NVD published 2026-09-28, status Analyzed.

Anyone running Apple Multiple Products in the version ranges below. Internet-facing instances are the priority.

• apple ipados: up to (not including) 26.7.1.
• apple iphone os: up to (not including) 26.7.1.
• apple macos: up to (not including) 15.8.1.
• apple macos: from 26.0 up to (not including) 26.7.1.

Version ranges come from the NVD CPE configuration. Confirm against the vendor advisory before you rely on them.

• Exploited in the wild: added to the CISA Known Exploited Vulnerabilities catalog on 2026-09-29; federal remediation due date 2026-10-13.
• Public proof-of-concept code: 6 GitHub repositories from 6 accounts, the first on 2026-10-01.

• EPSS (probability of exploitation activity in the next 30 days): 1.24%, higher than 69% of all scored CVEs (as of 2026-10-24).
• CVERadar threat level: 59/100 (see methodology).
• Likely ATT&CK techniques: T1203 Exploitation for Client Execution (inferred).

1. Find every instance. List where Apple Multiple Products runs, including test, DR and forgotten internet-facing systems, and record the installed version.
2. Upgrade to a fixed release. apple ipados: 26.7.1 or later; apple iphone os: 26.7.1 or later; apple macos: 15.8.1 or later; apple macos: 26.7.1 or later. Get the build from the vendor advisory.
3. If you can't patch today, follow CISA's required action: 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.
4. Verify the fix. Re-run the version check on every instance and confirm it reports the fixed build (26.7.1 or later). Re-scan from outside if the service is exposed.
5. Hunt for signs of earlier compromise. If the system was exposed before you patched, assume it may have been hit and check the items below.
6. Rotate credentials stored on or used by the affected system if you cannot rule out compromise, and keep the logs you reviewed.

Detection hints

• T1203 Exploitation for Client Execution: Exploitation of client or server software usually shows as crashes of the affected process followed by unexpected child processes; check EDR alerts for both.

Detection commands are generic starting points, not CVE-specific signatures. Use the indicators from the vendor advisory when it publishes them.

• NVD: CVE-2026-86950 nvd.nist.gov/vuln/detail/CVE-2026-86950
• CVE.org record www.cve.org/CVERecord?id=CVE-2026-86950
• Vendor link from CISA KEV support.apple.com/en-us/149226
• Vendor link from CISA KEV support.apple.com/en-us/149228
• Vendor link from CISA KEV support.apple.com/en-us/149229
• CISA KEV catalog www.cisa.gov/known-exploited-vulnerabilities-catalog
• FIRST EPSS (2026-10-24) api.first.org/data/v1/epss?cve=CVE-2026-86950