macOS MemCorrupt CVE-2026-39870 fixed in Sequoia 15.7.7, Sonoma 14.8.7, Tahoe 26.5
CVE-2026-39870 Published on May 11, 2026
The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.7.7, macOS Sonoma 14.8.7, macOS Tahoe 26.5. Processing a maliciously crafted image may corrupt process memory.
Vulnerability Analysis
CVE-2026-39870 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.
Weakness Type
What is a Buffer Overflow Vulnerability?
The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.
CVE-2026-39870 has been classified to as a Buffer Overflow vulnerability or weakness.
Products Associated with CVE-2026-39870
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Affected Versions
Apple macOS:- Before 14.8.7 is affected.
- Before 15.7.7 is affected.
- Before 26.5 is affected.