--- id: "CVE-2026-86879" kind: "vulnerability" aliases: ["CVE-2026-86879"] title: "A denial-of-service issue was addressed with improved input validation" severity: "medium" cvss: 6.5 epss: null exploited: false status: "open" category: "vendor" products: [{"name": "apple ipados", "fixed": ["27.0"], "affected": "< 27.0", "ecosystem": "vendor"}, {"name": "apple iphone os", "fixed": ["27.0"], "affected": "< 27.0", "ecosystem": "vendor"}] ecosystems: ["vendor"] tags: ["apple", "ios", "ipad", "ipados", "iphone", "vendor", "vendor-advisory"] not_affected_if: ["already-updated"] published_at: "2026-09-14T21:17:38+00:00" first_seen_at: "2026-10-31T00:35:03+00:00" updated_at: "2026-10-31T01:03:59+00:00" sources: [{"source": "lab", "url": "https://support.apple.com/en-us/149034", "first_seen_at": "2026-10-31T00:35:03+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-86879", "first_seen_at": "2026-10-31T01:03:59+00:00"}] --- # A denial-of-service issue was addressed with improved input validation Apple's iOS 27 and iPadOS 27 security notice lists many fixes, and CVE-2026-86879 is one entry under Baseband that Apple describes as a denial-of-service issue fixed by improved input validation. The sources do not say how severe the flaw is beyond a denial-of-service impact on the iPhone 11 and later. _Summary, check and fix written by a model from the sources; labelled as such._ ## Affected - vendor:apple ipados affected < 27.0 fixed 27.0 - vendor:apple iphone os affected < 27.0 fixed 27.0 ## How to check - Check the installed version under Settings > General > About (unknown whether the sources describe this exact path beyond the notice). - Compare against the iOS 27 release listed in the notice (released September 14, 2026). ## Fix - iOS 27 and iPadOS 27 (the release containing the fix; exact fixed build not stated in the sources) ## Timeline - 2026-10-31T00:35:03+00:00 lab https://support.apple.com/en-us/149034 — Apple: About the security content of iOS 27 and iPadOS 27 - Apple Support - 2026-10-31T01:03:59+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-86879 ## Documents - [advisory] Apple: About the security content of iOS 27 and iPadOS 27 - Apple Support https://support.apple.com/en-us/149034 ## From the sources About the security content of iOS 27 and iPadOS 27 - Apple Support # About the security content of iOS 27 and iPadOS 27 This document describes the security content of iOS 27 and iPadOS 27. ## About Apple security updates For our customers' protection, Apple doesn't disclose, discuss, or confirm security issues until an investigation has occurred and patches or releases are available. Recent releases are listed on the Apple security releases page. Apple security documents reference vulnerabilities by CVE-ID when possible. For more information about security, see the Apple Product Security page. ## iOS 27 and iPadOS 27 Released September 14, 2026 ### Accelerate Framework Available for: iPhone 11 and later, iPad Pro 12.9-inch 4th generation and later, iPad Pro 11-inch 2nd generation and later, iPad Air 4th generation and later, iPad 9th generation and later, and iPad mini 6th generation and later Impact: Processing a maliciously crafted image may lead to unexpected process termination Description: An out-of-bounds write issue was addressed with improved bounds checking. CVE-2026-86882: Peter Malone ### Accelerate Framework Available for: iPhone 11 and later, iPad Pro 12.9-inch 4th generation and later, iPad Pro 11-inch 2nd generation and later, iPad Air 4th generation and later, iPad 9th generation and later, and iPad mini 6th generation and later Impact: Processing a maliciously crafted image may lead to unexpected app termination Description: An out-of-bounds write issue was addressed with improved bounds checking. CVE-2026-86918: Arni Hardarson (Neonix Security) Entry added October 19, 2026 ### Accessibility Available for: iPhone 11 and later, iPad Pro 12.9-inch 4th generation and later, iPad Pro 11-inch 2nd generation and later, iPad Air 4th generation and later, iPad 9th generation and later, and iPad mini 6th generation and later Impact: An app may be able to access sensitive user data Description: This issue was addressed with improved data protection. CVE-2026-43664: Stuart Wallace, Ilya Andr (andrd3v), Rosyna Keller of Totally Not Malicious Software, CJ Vana, David Strnadel, Daniel Febrero, Asaf Cohen, Gongyu Ma (@Mezone0), Jian Lee (@speedyfriend433) ### Accessibility Available for: iPhone 11 and later, iPad Pro 12.9-inch 4th generation and later, iPad Pro 11-inch 2nd generation and later, iPad Air 4th generation and later, iPad 9th generation and later, and iPad mini 6th generation and later Impact: An app may be able to identify what other apps a user has installed Description: A privacy issue was addressed with improved handling of user preferences. ### Accounts Available for: iPhone 11 and later, iPad Pro 12.9-inch 4th generation and later, iPad Pro 11-inch 2nd generation and later, iPad Air 4th generation and later, iPad 9th generation and later, and iPad mini 6th generation and later Impact: A malicious application may be able to bypass Privacy preferences Description: An authorization issue was addressed with improved state management. ### APFS Available for: iPhone 11 and later, iPad Pro 12.9-inch 4th generation and later, iPad Pro 11-inch 2nd generation and later, iPad Air 4th generation and later, iPad 9th generation and later, and iPad mini 6th generation and later Impact: An app may be able to cause unexpected system termination or write kernel memory Description: An out-of-bounds write issue was addressed with improved bounds checking. ### App Intents Available for: iPhone 11 and later, iPad Pro 12.9-inch 4th generation and later, iPad Pro 11-inch 2nd generation and later, iPad Air 4th generation and later, iPad 9th generation and later, and iPad mini 6th generation and later Impact: An app may be able to access sensitive user data Description: A privacy issue was addressed with improved access restrictions. Entry added October 19, 2026 ### App Store Available for: iPhone 11 and later, iPad Pro 12.9-inch 4th generation and later, iPad Pro 11-inch 2nd generation and later, iPad Air 4th generation and later, iPad 9th generation and later, and iPad mini 6th generation and later Impact: A local app may be able to read a persistent account identifier Description: A permissions issue was addressed with additional restrictions. ### Apple Account Available for: iPhone 11 and later, iPad Pro 12.9-inch 4th generation and later, iPad Pro 11-inch 2nd generation and later, iPad Air 4th generation and later, iPad 9th generation and later, and iPad mini 6th generation and later Impact: An app may be able to use the Sign In With Apple authentication flow to access the user's Apple Account Description: An authentication issue was addressed with improved state management. CVE-2026-20683: Dem0ns (@天府简易信工作室), Abdelhak Kherroubi, Jasminder Pal Singh, Lehan Dilusha Jayasingha (Sri Lanka) ### Apple Intelligence Available for: iPhone 15 Pro and later, iPad Pro 12.9-inch 5th generation and later, iPad Pro 11-inch 2nd generation and later, iPad Air 5th generation and later, and iPad mini 7th generation Impact: An app may be able to access sensitive user data Description: An authorization issue was addressed with improved state management. CVE-2026-86920: Johan Wahyudi CVE-2026-86955: Abodi Dawoud Entry added October 19, 2026, updated October 26, 2026 ### Apple Neural Engine Available for: iPhone 11 and later, iPad Pro 12.9-inch 4th generation and later, iPad Pro 11-inch 2nd generation and later, iPad Air 4th generation and later, iPad 9th generation and later, and iPad mini 6th generation and later Impact: An app may be able to cause unexpected system termination Description: An integer overflow was addressed with improved input validation. ### Apple Neural Engine Available for: iPhone 11 and later, iPad Pro 12.9-inch 4th generation and later, iPad Pro 11-inch 2nd generation and later, iPad Air 4th generation and later, iPad 9th generation and later, and iPad mini 6th generation and later Impact: An app may be able to cause unexpected system termination or write kernel memory CVE-2026-84634: S. Rosario Entry added October 26, 2026 ### Apple Neural Engine Available for: iPhone 11 and later, iPad Pro 12.9-inch 4th generation and later, iPad Pro 11-inch 2nd generation and later, iPad Air 4th generation and later, iPad 9th generation and later, and iPad mini 6th generation and later Impact: An app may be able to cause unexpected system termination Description: An out-of-bounds write issue was addressed with improved bounds checking. Entry added October 26, 2026 ### AppleAVD Available for: iPhone 11 and later, iPad Pro 12.9-inch 4th generation and later, iPad Pro 11-inch 2nd generation and later, iPad Air 4th generation and later, iPad 9th generation and later, and iPad mini 6th generation and later Impact: An app may be able to cause unexpected system termination Description: A use after free issue was addressed with improved memory management. ### AppleDouble Available for: iPhone 11 and later, iPad Pro 12.9-inch 4th generation and later, iPad Pro 11-inch 2nd generation and later, iPad Air 4th generation and later, iPad 9th generation and later, and iPad mini 6th generation and later Impact: Mounting a disk image with maliciously crafted files may lead to unexpected system termination Description: An out-of-bounds write issue was addressed with improved bounds checking. ### AppleKeyStore Available for: iPhone 11 and later, iPad Pro 12.9-inch 4th generation and later, iPad Pro 11-inch 2nd generation and later, iPad Air 4th generation and later, iPad 9th generation and later, and iPad mini 6th generation and later Impact: An app may be able to cause unexpected system termination Description: A use after free issue was addressed with improved memory management. ### Authentication Services Available for: iPhone 11 and later, iPad Pro 12.9-inch 4th generation and later, iPad Pro 11-inch 2nd generation and later, iPad Air 4th generation and later, iPad 9th generation and later, --- _Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_