CVE-2026-20657: A buffer overflow issue was addressed with improved memory handling

Description

A buffer overflow issue was addressed with improved memory handling. This issue is fixed in iOS 18.7.7 and iPadOS 18.7.7, iOS 26.4 and iPadOS 26.4, macOS Sequoia 15.7.5, macOS Sonoma 14.8.5, macOS Tahoe 26.4, visionOS 26.4. Parsing a maliciously crafted file may lead to an unexpected app termination.

CVSS vector

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

Attack vector

Network

Complexity

Low

Privileges

None

User interaction

Required

Confidentiality

None

Integrity

None

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.6% · higher than 47% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

MA

macOS · Apple

before 14.8.5; before 15.7.5; before 26.4 · source: vendor, NVD

IO

iOS · Apple

before 18.7.7 · source: NVD

IA

iOS and iPadOS · Apple

before 18.7.7; before 26.4 · source: vendor

VI

visionOS · Apple

before 26.4 · source: vendor