CVE-2026-28817
Sandbox escape via race condition in macOS sandboxing
Is CVE-2026-28817 being exploited?
Not confirmed. CVE-2026-28817 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 0.16% probability of exploitation in the next 30 days.
How severe is CVE-2026-28817?
CVE-2026-28817 is rated High with a CVSS score of 8.1. 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-2026-28817?
Yes. A fix has been recorded for CVE-2026-28817. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-28817 affect?
CVE-2026-28817 affects macOS Sequoia 15.7.5, macOS Sonoma 14.8.5, macOS Tahoe 26.4. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-28817?
Update to fixed macOS versions (Sequoia 15.7.5, Sonoma 14.8.5, Tahoe 26.4)
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Sandboxed process could bypass restrictions and access restricted resources
Patch when possible
- affected< 14.8.5
- affected< 15.7.5
- affected< 26.4
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.