CVE-2026-43748
macOS out‑of‑bounds write lets an app cause system termination (DoS).
Is CVE-2026-43748 being exploited?
Not confirmed. CVE-2026-43748 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 0.60% probability of exploitation in the next 30 days.
How severe is CVE-2026-43748?
CVE-2026-43748 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-2026-43748?
Yes. A fix has been recorded for CVE-2026-43748. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-43748 affect?
CVE-2026-43748 affects macOS Sequoia (fixed in 15.7.8), macOS Tahoe (fixed in 26.6), macOS versions prior to those fixes. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-43748?
Update macOS to Sequoia 15.7.8 or Tahoe 26.6 immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
A local/malicious app can trigger an out‑of‑bounds write causing system termination/denial of service on macOS endpoints.
Patch when possible
- 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.