Zero-day vulnerability in macOS

Buffer overflow
CVE-2026-20700

Vulnerability details

Advisory: SB2026021188 - Multiple vulnerabilities in Apple macOS Tahoe

Vulnerable component: macOS

CVE-ID: CVE-2026-20700

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C

CWE-ID: CWE-119 - Memory corruption

Description:

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error in dyld. A local user can trigger memory corruption and execute arbitrary code on the target system.

Note, the vulnerability is being actively exploited in the wild in conjunction with vulnerabilities #VU119833 (CVE-2025-14174) and #VU119902 (CVE-2025-43529). 

External links:

https://support.apple.com/en-us/126348

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.