CVE-2026-64691
macOS buffer overflow allows an app to crash the system (DoS).
Is CVE-2026-64691 being exploited?
Not confirmed. CVE-2026-64691 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.45% probability of exploitation in the next 30 days.
How severe is CVE-2026-64691?
CVE-2026-64691 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-64691?
Yes. A fix has been recorded for CVE-2026-64691. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-64691 affect?
CVE-2026-64691 affects macOS Tahoe versions prior to 26.6. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-64691?
Install macOS Tahoe 26.6 immediately and avoid running untrusted apps.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
A malicious or untrusted app can trigger a buffer overflow causing unexpected system termination (local/system DoS).
Immediate action required
- affected< 26.6
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.