CVE-2026-64704: Apple macOS Use-After-Free Vulnerability

CVE-2026-64704 Overview

CVE-2026-64704 is a type confusion vulnerability [CWE-843] affecting multiple versions of Apple macOS. Apple addressed the issue with improved memory handling in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6. According to Apple, a malicious app can trigger unexpected system termination, resulting in a denial-of-service condition on the affected host.

The issue carries a CVSS 3.1 base score of 9.8 and is tracked under the network attack vector. No public proof-of-concept, exploit code, or in-the-wild exploitation has been reported at the time of publication.

Critical Impact
A local application on an unpatched macOS host can cause unexpected system termination, disrupting availability of the operating system.

Affected Products

Apple macOS Sequoia versions prior to 15.7.8
Apple macOS Sonoma versions prior to 14.8.8
Apple macOS Tahoe versions prior to 26.6

Discovery Timeline

2026-07-27 - CVE-2026-64704 published to the National Vulnerability Database
2026-07-28 - CVE-2026-64704 last modified in the NVD database

Technical Details for CVE-2026-64704

Vulnerability Analysis

The vulnerability is a type confusion condition [CWE-843] within an unspecified macOS component. Type confusion occurs when code allocates or accesses a resource using one type but later interprets that resource as an incompatible type. The mismatch corrupts internal state, causing invalid memory dereferences or unsafe control-flow decisions.

Apple's advisory states that the issue leads to unexpected system termination when triggered by a malicious application. Type confusion bugs in operating system components often extend beyond crashes and can be developed into memory-corruption primitives, though Apple has not confirmed any code-execution impact for this CVE.

Root Cause

According to Apple's advisories linked from the CVE record, the flaw was addressed with improved memory handling. This wording typically indicates missing or insufficient type checks on an object before it is used along a code path expecting a different type. Apple has not published component-level details beyond the fixed versions.

Attack Vector

Apple describes the exploitation prerequisite as "an app may be able to cause unexpected system termination." A local application must run on the target macOS host and invoke the affected code path with crafted input. The NVD CVSS vector lists the attack as network-reachable with no privileges or user interaction required, reflecting worst-case scoring rather than a confirmed remote path.

No verified exploitation code is available. Refer to Apple Support Document #128067, Apple Support Document #128071, and Apple Support Document #128072 for vendor-supplied technical context.

Detection Methods for CVE-2026-64704

Indicators of Compromise

Unexpected kernel panics or system termination events on macOS hosts running versions prior to 15.7.8, 14.8.8, or 26.6.
Panic logs in /Library/Logs/DiagnosticReports/ referencing type-related exceptions or invalid memory access from recently launched user applications.
Newly installed or unsigned applications immediately preceding a system crash on affected macOS builds.

Detection Strategies

Inventory macOS endpoints and flag any host reporting a build older than 15.7.8, 14.8.8, or 26.6 as vulnerable.
Correlate application launch telemetry with kernel panic and unexpected reboot events to identify processes that trigger termination.
Monitor for repeated crash reports produced by the same application binary across multiple hosts, which may indicate active exploitation attempts.

Monitoring Recommendations

Forward ReportCrash and spindump output to a central log platform for correlation across the fleet.
Alert on repeated panic() entries or com.apple.shutdownStall events on macOS endpoints.
Track software installation events for unsigned or newly seen binaries preceding system instability.

How to Mitigate CVE-2026-64704

Immediate Actions Required

Update macOS Sequoia hosts to 15.7.8, macOS Sonoma hosts to 14.8.8, and macOS Tahoe hosts to 26.6 through Software Update.
Restrict installation and execution of untrusted third-party applications until patches are applied enterprise-wide.
Enforce Gatekeeper and notarization requirements to reduce the pool of code that can reach the vulnerable path.

Patch Information

Apple released fixes in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6. Technical details and version notes are published in Apple Support Document #128067, Apple Support Document #128071, and Apple Support Document #128072.

Workarounds

No vendor-supplied workaround exists; apply the referenced macOS updates as the primary remediation.
Limit local user privileges and application allow-lists to reduce the attack surface until patches are deployed.
Enable automatic macOS updates through MDM policy to accelerate rollout across managed fleets.

bash

# Verify installed macOS version and apply pending updates
sw_vers -productVersion
sudo softwareupdate --list
sudo softwareupdate --install --all --restart