CVE-2026-64767

CRITICAL 9.8 ALL-YEARS

Published 2026-07-27 · Last modified 2026-07-28 · apple · NVD: Analyzed

A buffer overflow was addressed with improved bounds checking. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. A remote attacker may be able to cause unexpected system termination or corrupt kernel memory.

ELEVATED IMPACT

Severe if exploited (CVSS 9.8), but no confirmed exploitation. Patch on a normal cadence.

Exploitation likelihood

0.8%chance of exploitation in 30 days · 56th percentile

○ In CISA KEV○ Catalogued PoC◆ SSVC: exploitation none, automatable yes

Impact if exploited

9.8CVSS 3.1 · CRITICAL · ADP

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

What an attacker needs

✓Access: Reachable over the network — no local access needed
✓Privileges: No account or privileges required
✓User interaction: No user interaction needed
✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

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Tracked sources are checked weekly for the full archive, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Affected

Vendors Apple

Products Macos

Weakness (CWE)

CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References and research data (JSON)

Known Affected Software Configurations

Vendor	Product	Version range
Apple	Macos	≥ 14.0 and < 14.8.8
Apple	Macos	≥ 15.0 and < 15.7.8
Apple	Macos	≥ 26.0 and < 26.6

All CVSS metrics

CRITICAL 9.8 v3.1 · ADP Primary
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CRITICAL 9.8 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Advisories

https://support.apple.com/en-us/128067 Release NotesVendor AdvisoryCVE record · apple · Updated 2026-07-27T20:13:51.882Z
NVD · CVE-2026-64767 · Updated 2026-07-28T17:59:45.307
https://support.apple.com/en-us/128071 Release NotesVendor AdvisoryCVE record · apple · Updated 2026-07-27T20:13:51.882Z
NVD · CVE-2026-64767 · Updated 2026-07-28T17:59:45.307
https://support.apple.com/en-us/128072 Release NotesVendor AdvisoryCVE record · apple · Updated 2026-07-27T20:13:51.882Z
NVD · CVE-2026-64767 · Updated 2026-07-28T17:59:45.307
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-49551 ADVISORYEUVD · EUVD-2026-49551

Sources: NVD · CVE.org · All sources and attribution · EPSS