Critical integer overflow in widely deployed Apple OSes affecting many enterprise and consumer endpoints; high-impact patch should be broadly distributed.
CVE-2026-64774
Integer overflow in Apple OSes can crash apps or corrupt heap; urgent patch available.
Is CVE-2026-64774 being exploited?
Not confirmed. CVE-2026-64774 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 0.65% probability of exploitation in the next 30 days.
How severe is CVE-2026-64774?
CVE-2026-64774 is rated Critical. 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-2026-64774?
Yes. A fix has been recorded for CVE-2026-64774. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-64774 affect?
CVE-2026-64774 affects iOS 26.6, iPadOS 26.6, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and 3 further products or versions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-64774?
Install vendor updates to the listed OS versions immediately.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote attacker can cause application termination or heap corruption, leading to denial of service or potential memory-corruption exploits.
Immediate action required
- affected< 18.7.10
- affected< 26.6
- affected< 14.8.8
- affected< 15.7.8
- affected< 26.6
- affected< 26.6
- 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.