DarkSword: Researchers uncover another iOS exploit kit

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-2025-31277 is a memory-handling flaw (buffer overflow, CWE-119/CWE-120) in Apple's WebKit engine, the component that renders web content in Safari and in webviews across Apple platforms. It is triggered when a user processes maliciously crafted web content, typically by visiting an attacker-controlled page, causing memory corruption that can compromise the rendering process, with CVSS 3.1 scoring high impact to confidentiality, integrity and availability (8.8) via a network vector requiring user interaction but no privileges. Everyone running WebKit is affected: Safari users and devices on iOS/iPadOS, macOS Sequoia, tvOS, visionOS and watchOS prior to the fixed releases, plus Linux users of WebKitGTK and WPE WebKit as shipped with Red Hat Enterprise Linux (including the AUS and ELS channels). Exploitation is confirmed in the wild: CISA added the bug to its Known Exploited Vulnerabilities catalog on 2026-03-20 (ransomware linkage unknown) with a BOD 22-01 remediation deadline of 2026-04-03, and contemporaneous reporting describes 'DarkSword', an iOS exploit kit chaining multiple Apple flaws, reportedly including zero-days, in global attacks, possibly including this bug. No public proof-of-concept is known, and fixes shipped in Safari 18.6, iOS/iPadOS 18.6, macOS Sequoia 15.6, tvOS 18.6, visionOS 2.6 and watchOS 11.6.

Do: Upgrade Safari to 18.6 or later and apply the corresponding OS updates: iOS/iPadOS 18.6, macOS Sequoia 15.6, tvOS 18.6, visionOS 2.6 and watchOS 11.6; on Red Hat Enterprise Linux (including AUS/ELS) install Red Hat's updated WebKitGTK/WPE WebKit packages. Organizations subject to CISA BOD 22-01 must patch or mitigate by the April 3, 2026 deadline. Until patched, restrict WebKit-based browsing and webviews on affected devices to trusted content, since exploitation requires loading maliciously crafted web content.

CVE-2025-43510 is an improper locking flaw (CWE-667) in Apple's operating systems that leads to memory corruption, addressed by improved lock state checking. It is triggered locally: a malicious application already running on the device can cause unexpected changes in memory shared between processes, with the CVSS vector (AV:L, UI:R) indicating user interaction is required but no privileges needed beforehand. Successful exploitation could corrupt or expose cross-process shared memory, yielding high impacts on confidentiality, integrity, and availability (CVSS 3.1 score 7.8), and such shared-memory corruption bugs in Apple's OSes are commonly leveraged as steps in chained attacks such as sandbox escapes. All users of iOS, iPadOS, macOS (Sonoma, Sequoia, and Tahoe branches), tvOS, visionOS, and watchOS on versions earlier than the fixed releases are affected. The vulnerability is being exploited in the wild: CISA added it to the Known Exploited Vulnerabilities catalog on 2026-03-20 with a federal patching deadline of April 3, 2026, and news reports describe an active iOS exploit kit ('DarkSword') using multiple Apple flaws, including zero-days, in global attacks.

Do: Update to the fixed releases: iOS/iPadOS 18.7.2 or iOS/iPadOS 26.1; macOS Sonoma 14.8.2, Sequoia 15.7.2, or Tahoe 26.1; tvOS 26.1; visionOS 26.1; and watchOS 26.1. As a local attack vector, prioritize patching devices that install untrusted apps, and federal agencies must apply the fixes under BOD 22-01 by April 3, 2026 per the CISA KEV listing. Given reports of the DarkSword iOS exploit kit chaining multiple Apple flaws in active attacks, treat unpatched iPhones and iPads as high priority and verify OS versions across your fleet.

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.