Widespread Apple OS impact; sandbox bypass and DoS risk across devices.
CVE-2026-20677
Race condition in Apple OS may bypass sandbox; DoS risk.
Is CVE-2026-20677 being exploited?
Not confirmed. CVE-2026-20677 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 0.29% probability of exploitation in the next 30 days.
How severe is CVE-2026-20677?
CVE-2026-20677 is rated Critical with a CVSS score of 9.0. 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-2026-20677?
Yes. A fix has been recorded for CVE-2026-20677. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-20677 affect?
CVE-2026-20677 affects macOS Tahoe 26.3, macOS Sonoma 14.8.4, iOS 18.7.5, iPadOS 18.7.5, 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-2026-20677?
Patch all affected Apple devices at earliest.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Sandbox bypass and DoS via shortcut race; could enable privilege escalation on Apple devices.
Immediate action required
- affected< 18.7.5
- affected< 26.3
- affected< 14.8.4
- affected< 15.7.4
- affected< 26.3
- affected< 26.3
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.