What is CVE-2026-86876?
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 26.7 and iPadOS 26.7, iOS 27 and iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, visionOS 27, watchOS 27. A sandboxed process may be able to circumvent sandbox restrictions.
The record classifies CVE-2026-86876 under weakness class CWE-787. Its CVSS v3 base vector states that the flaw requires local access to the host, needs low-privilege credentials, needs no user interaction. 4 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 39 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 5.2 — MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N - EPSS (FIRST)
- 0.1% probability of exploitation in the next 30 days, higher than 3.9% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 2.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-09-14
Is CVE-2026-86876 being exploited?
It currently carries a trending score of 29 in the Threadlinqs vulnerability feed.
Affected products and versions
- Apple: iOS and iPadOS, macOS, visionOS, watchOS
How to fix CVE-2026-86876
No vendor patch reference has been recorded for CVE-2026-86876 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2026-86876
1 tracked threat in the Threadlinqs corpus references CVE-2026-86876, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on .
Other references
- support.apple.com
- support.apple.com (149035)
- support.apple.com (149037)
- support.apple.com (149038)
- support.apple.com (149041)
Showing 5 of 7 recorded references.