---
title: "CVE-2026-65390: Apple Safari - Integer Overflow"
description: "Apple Safari, iOS, iPadOS, macOS Tahoe, tvOS, visionOS, and watchOS contain an integer overflow caused by insufficient input validation when processing web content, letting attackers cause memory corruption, exploit requires malicious web content."
url: https://panop.io/threat-heartbeat/CVE-2026-65390/
---

# CVE-2026-65390 Apple Safari - Integer Overflow

Apple Safari, iOS, iPadOS, macOS Tahoe, tvOS, visionOS, and watchOS contain an integer overflow caused by insufficient input validation when processing web content, letting attackers cause memory corruption, exploit requires malicious web content.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.41% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-65390)

## Details

Type

Integer Overflow

CVSS vector

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

Published

14 September 2026

Updated

15 October 2026

Weakness

[CWE-190](https://cwe.mitre.org/data/definitions/190.html)

## Vendor fix

Update to Safari 26.6.1, iOS 26.6.1, iPadOS 26.6.1, macOS Tahoe 26.6.2, tvOS 27, visionOS 27, watchOS 27 or latest available versions

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-65390](https://nvd.nist.gov/vuln/detail/CVE-2026-65390)
- [https://support.apple.com/en-us/149038](https://support.apple.com/en-us/149038)
- [https://support.apple.com/en-us/148281](https://support.apple.com/en-us/148281)
- [https://support.apple.com/en-us/148282](https://support.apple.com/en-us/148282)
- [https://support.apple.com/en-us/148286](https://support.apple.com/en-us/148286)
- [https://support.apple.com/en-us/149036](https://support.apple.com/en-us/149036)
- [https://support.apple.com/en-us/149037](https://support.apple.com/en-us/149037)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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