Apple fixes zero-day flaw exploited in targeted attacks (CVE-2026-20700)

Google Chromium contains an out of bounds memory access vulnerability in ANGLE, the graphics translation layer that handles rendering APIs such as WebGL. A remote attacker can trigger the flaw by luring a user to open a crafted HTML page, causing the browser to access memory outside of allocated bounds. Successful exploitation may permit memory disclosure or corruption in the renderer process, although the available data does not fully characterize the impact. Any user of a Chromium-based browser is potentially affected, including users of Google Chrome, Microsoft Edge, and Opera, among other Chromium-derived browsers. The vulnerability was added to CISA's Known Exploited Vulnerabilities catalog on 2025-12-12, indicating active exploitation, while no public proof-of-concept is known and no CVSS score has been assigned yet.

Do: Update all Chromium-based browsers (Google Chrome, Microsoft Edge, Opera, and derivatives) to the latest vendor-released versions and verify the installed browser build on managed endpoints, enabling automatic updates where possible. Because this flaw is in CISA KEV, apply vendor mitigations per vendor instructions or follow applicable BOD 22-01 guidance for cloud services, and prioritize patching internet-facing and high-risk user populations.

CVE-2025-43529 is a use-after-free (CWE-416) flaw in Apple's WebKit browser engine, fixed via improved memory management. It is triggered when a device processes maliciously crafted web content, and successful exploitation can lead to arbitrary code execution with network reachability and no privileges required (CVSS 3.1: 8.8, user interaction needed). It affects a broad range of Apple products: Safari, iPhone OS/iOS, iPadOS, macOS, tvOS, visionOS, and watchOS, with fixes delivered in Safari 26.2, iOS/iPadOS 18.7.3 and 26.2, macOS Tahoe 26.2, tvOS 26.2, visionOS 26.2, and watchOS 26.2. Apple reports the issue was exploited in an 'extremely sophisticated' targeted attack against specific individuals on iOS versions before iOS 26, and CISA added it to the Known Exploited Vulnerabilities catalog on 2025-12-15 (a companion CVE-2025-14174 was issued for the same report). No public proof-of-concept is known, and EPSS assigns an 8.9% probability of exploitation within 30 days (95th percentile).

Do: Update affected devices to Safari 26.2, iOS/iPadOS 26.2 (or iOS/iPadOS 18.7.3 on devices that remain on the iOS 18 branch), macOS Tahoe 26.2, tvOS 26.2, visionOS 26.2, and watchOS 26.2, prioritizing mobile users and high-risk targeted individuals. Federal agencies must remediate per CISA BOD 22-01 requirements since the CVE is in the KEV catalog (added 2025-12-15); also review the related CVE-2025-14174 addressed by the same updates. Check device fleet inventory for WebKit-exposed Apple hardware that cannot reach the fixed versions and confirm patches have been applied.

CVE-2026-20700 is a memory corruption (buffer overflow) issue in multiple Apple operating systems that Apple addressed through improved state management. The flaw requires a local attack vector: an attacker who already has some memory-write capability on the device — typically obtained via a chained exploit such as a browser or sandbox escape — can leverage this bug to execute arbitrary code. Attackers gain code execution with the privileges of the compromised component, with high impact on confidentiality, integrity, and availability per the CVSS 7.8 (High) score. All users of iPhone, iPad, Mac, Apple TV, Vision Pro, and Apple Watch running versions earlier than the 26.3 updates are affected. Apple reports the flaw may have been exploited in an extremely sophisticated attack against specific targeted individuals on iOS versions before iOS 26, and CISA added it to the Known Exploited Vulnerabilities catalog on 2026-02-12; related CVEs CVE-2025-14174 and CVE-2025-43529 were issued from the same report.

Do: Update all Apple devices to iOS/iPadOS 26.3, macOS Tahoe 26.3, tvOS 26.3, visionOS 26.3, and watchOS 26.3 or later; the fix also addresses related CVE-2025-14174 and CVE-2025-43529 from the same report. Federal agencies must meet the KEV/BOD 22-01 deadline by patching per vendor instructions or discontinuing affected device use. Given the targeted, exploit-kit-driven attacks (e.g., DarkSword/Coruna tooling reported in the wild), prioritize updates for high-risk users such as executives, journalists, and activists, and verify fleet-wide OS versions rather than assuming patch compliance.