CVE-2026-43818
Integer overflow in Apple image processing leading to remote code execution.
Is CVE-2026-43818 being exploited?
Not confirmed. CVE-2026-43818 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 0.70% probability of exploitation in the next 30 days.
How severe is CVE-2026-43818?
CVE-2026-43818 is rated High with a CVSS score of 8.8. 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-2026-43818?
Yes. A fix has been recorded for CVE-2026-43818. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-43818 affect?
CVE-2026-43818 affects iOS < 26.6 (fixed in 26.6), iPadOS < 26.6 (fixed in 26.6), macOS Sequoia < 15.7.8 (fixed in 15.7.8), macOS Sonoma < 14.8.8 (fixed in 14.8.8), and 1 further product or version. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-43818?
Apply Apple updates to iOS/iPadOS 26.6 or the listed macOS fixes immediately.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Processing a malicious image can trigger an integer overflow and allow arbitrary code execution, enabling device takeover or data theft.
Immediate action required
- affected< 18.7.10
- affected< 26.6
- 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.