What is CVE-2026-43677?

CVE-2026-43677 is a medium-severity vulnerability in Apple macOS, classified under Out-of-bounds Write. CVSS score: 6.5/10. Published 2026-09-14.

How severe is CVE-2026-43677?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Buffer overflow in Apple macOS

CVE-2026-43677

An out-of-bounds write issue was addressed by removing the vulnerable code. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. Connecting to a malicious WebDAV server may lead to unexpected app termination.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

Affected products

Apple Macos

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

product-security@apple.com (Release Notes, Vendor Advisory)
product-security@apple.com (Release Notes, Vendor Advisory)
product-security@apple.com (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2026-43677?: CVE-2026-43677 is a medium-severity vulnerability in Apple macOS, classified under Out-of-bounds Write. CVSS score: 6.5/10. Published 2026-09-14.
How severe is CVE-2026-43677?: Medium severity. CVSS v3 base score is 6.5 out of 10.