CVE-2026-64703
Use-after-free in macOS allows a malicious app to crash the system/produce DoS; patch available.
Is CVE-2026-64703 being exploited?
Not confirmed. CVE-2026-64703 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 0.78% probability of exploitation in the next 30 days.
How severe is CVE-2026-64703?
CVE-2026-64703 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-2026-64703?
Yes. A fix has been recorded for CVE-2026-64703. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-64703 affect?
CVE-2026-64703 affects macOS Sequoia prior to 15.7.8, macOS Sonoma prior to 14.8.8, macOS Tahoe prior to 26.6, macOS desktops/laptops running older builds. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-64703?
Install macOS updates to Sequoia 15.7.8 / Sonoma 14.8.8 / Tahoe 26.6 immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
A malicious app can trigger a use-after-free to crash processes or the system, causing denial-of-service on affected macOS hosts.
Patch when possible
- affected< 14.8.8
- affected< 15.7.8
- 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.