What’s Vulnerable › Vulnerabilities

CVE-2026-20657

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-25 · updated 2026-10-26
• Weakness: CWE-119

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.

Affected products

• Apple iPadOS: before 18.7.7 — fixed in 18.7.7
• Apple Iphone Os: before 18.7.7 — fixed in 18.7.7
• Apple macOS: from 14.0 before 14.8.5; from 15.0 before 15.7.5 — fixed in 14.8.5, 15.7.5
• Apple iOS and iPadOS: before 18.7.7; before 26.4 — fixed in 18.7.7, 26.4
• Apple macOS: before 14.8.5; before 15.7.5; before 26.4 — fixed in 14.8.5, 15.7.5, 26.4
• Apple visionOS: before 26.4 — fixed in 26.4

How to fix

Upgrade to a fixed version: Apple iPadOS 18.7.7; Apple Iphone Os 18.7.7; Apple macOS 14.8.5, 15.7.5; Apple iOS and iPadOS 18.7.7, 26.4; Apple macOS 14.8.5, 15.7.5, 26.4; Apple visionOS 26.4. Check the vendor advisory for mitigations.

References

• https://support.apple.com/en-us/126792
• https://support.apple.com/en-us/126793
• https://support.apple.com/en-us/126794
• https://support.apple.com/en-us/126795
• https://support.apple.com/en-us/126796
• https://support.apple.com/en-us/126799

Get alerted when CVE-2026-20657 or the next vulnerability affects your stack