CVE-2026-20657

Name: CVE-2026-20657
Creator: NVD / NIST
Published: 2026-03-25T01:17:04.847+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.54%

Last modified Jun 17, 2026

CVE-2026-20657 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.54% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.54%

41.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Apple	Ipados	< 18.7.7
Apple	Iphone Os	< 18.7.7
Apple	Macos	>= 14.0, < 14.8.5
Apple	Macos	>= 15.0, < 15.7.5

References

https://support.apple.com/en-us/126792
https://support.apple.com/en-us/126793Release Notes, Vendor Advisory
https://support.apple.com/en-us/126794
https://support.apple.com/en-us/126795Release Notes, Vendor Advisory
https://support.apple.com/en-us/126796Release Notes, Vendor Advisory
https://support.apple.com/en-us/126799

Timeline

Published: Mar 25, 2026
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2026-20657?

How severe is CVE-2026-20657?

CVE-2026-20657 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.54% probability of exploitation in the next 30 days.

How do I fix CVE-2026-20657?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-20657?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST