EUVD-2026-40203
GHSA-x77j-94p3-8rx3
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Requires a local app with low privileges (AV:L, PR:L) and no user interaction; kernel memory write and system termination give total impact (C/I/A:H).
Primary rating from Vendor (apple).
CVSS VectorVendor: apple
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
10DescriptionCVE.org
The issue was addressed with improved input sanitization. This issue is fixed in iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2. An app may be able to cause unexpected system termination or write kernel memory.
AnalysisAI
Local privilege escalation and kernel memory corruption in Apple iOS, iPadOS (before 26.5.2) and macOS Tahoe (before 26.5.2) allows a malicious or compromised app to write kernel memory or force unexpected system termination by supplying improperly validated input to a privileged interface. Apple resolved the flaw through improved input sanitization. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already be able to run code locally on the device as a normal app (CVSS PR:L, AV:L) - i.e., a malicious, compromised, or sandbox-escaping application installed on the iPhone, iPad, or Mac; it cannot be triggered remotely over the network. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are largely consistent and point to a serious-but-not-emergency local issue. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A user installs a malicious or trojanized app (or an attacker leverages an already-compromised app process); the app issues crafted, improperly-validated input to a vulnerable kernel interface, causing a write into kernel memory that either crashes the device (denial of service) or is shaped toward privilege escalation and full system compromise. No user interaction beyond running the app is required, but no public exploit code has been identified at time of analysis. |
| Remediation | Vendor-released patch: update to iOS 26.5.2, iPadOS 26.5.2, and macOS Tahoe 26.5.2, which fix the issue via improved input sanitization (see Apple advisories https://support.apple.com/en-us/127594 and https://support.apple.com/en-us/127595). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Audit device inventory to identify systems running iOS/iPadOS versions before 26.5.2 and macOS Tahoe before 26.5.2. …
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External POC / Exploit Code
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