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Vulnerability · Published Mar 17, 2026 · Assigned by apple

CVE-2026-20643

Medium 5.4

In plain English

A medium-severity improper input validation in iOS and iPadOS from Apple. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.4%top 69.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC

Official description

A cross-origin issue in the Navigation API was addressed with improved input validation. This issue is fixed in Background Security Improvements for iOS, iPadOS, and macOS, Safari 26.4, iOS 18.7.7 and iPadOS 18.7.7, iOS 26.4 and iPadOS 26.4, macOS Tahoe 26.4, visionOS 26.4. Processing maliciously crafted web content may bypass Same Origin Policy.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8webkit2gtk32.52.3-1.el8_10ALSA-2026:10702
AlmaLinux:9webkit2gtk32.52.3-1.el9_8ALSA-2026:19206
AlmaLinux:9webkit2gtk32.52.3-0.el9_7.1ALSA-2026:9692
AlmaLinux:8webkit2gtk3-devel2.52.3-1.el8_10ALSA-2026:10702
AlmaLinux:9webkit2gtk3-devel2.52.3-0.el9_7.1ALSA-2026:9692
AlmaLinux:9webkit2gtk3-devel2.52.3-1.el9_8ALSA-2026:19206
AlmaLinux:8webkit2gtk3-jsc2.52.3-1.el8_10ALSA-2026:10702
AlmaLinux:9webkit2gtk3-jsc2.52.3-1.el9_8ALSA-2026:19206
AlmaLinux:9webkit2gtk3-jsc2.52.3-0.el9_7.1ALSA-2026:9692
AlmaLinux:8webkit2gtk3-jsc-devel2.52.3-1.el8_10ALSA-2026:10702
AlmaLinux:9webkit2gtk3-jsc-devel2.52.3-1.el9_8ALSA-2026:19206
AlmaLinux:9webkit2gtk3-jsc-devel2.52.3-0.el9_7.1ALSA-2026:9692
Debian:12webkit2gtkno fix listedDEBIAN-CVE-2026-20643
Debian:13webkit2gtk2.52.3-2~deb13u1DEBIAN-CVE-2026-20643
Debian:14webkit2gtk2.52.1-1DEBIAN-CVE-2026-20643
Debian:12wpewebkitno fix listedDEBIAN-CVE-2026-20643
Debian:13wpewebkitno fix listedDEBIAN-CVE-2026-20643
Debian:14wpewebkit2.52.1-1DEBIAN-CVE-2026-20643
Rocky Linux:8webkit2gtk30:2.52.3-1.el8_10RLSA-2026:10702
Rocky Linux:9webkit2gtk30:2.52.3-0.el9_7.1RLSA-2026:9692
Rocky Linux:9webkit2gtk30:2.52.3-1.el9_8RLSA-2026:19206
Ubuntu:22.04:LTSqtwebkit-opensource-srcno fix listedUBUNTU-CVE-2026-20643
Ubuntu:24.04:LTSqtwebkit-opensource-srcno fix listedUBUNTU-CVE-2026-20643
Ubuntu:22.04:LTSwebkit2gtkno fix listedUBUNTU-CVE-2026-20643
Ubuntu:24.04:LTSwebkit2gtk2.52.3-0ubuntu0.24.04.1UBUNTU-CVE-2026-20643
Ubuntu:25.10webkit2gtk2.52.3-0ubuntu0.25.10.1UBUNTU-CVE-2026-20643
Ubuntu:26.04:LTSwebkit2gtk2.52.3-0ubuntu0.26.04.2UBUNTU-CVE-2026-20643
Ubuntu:22.04:LTSwpewebkitno fix listedUBUNTU-CVE-2026-20643

Affected products (as reported)

VendorProductVersions
Apple Safari 0 – before 26.4
Apple iOS and iPadOS 0 – before 18.7.70 – before 26.3.1 (a)0 – before 26.4
Apple macOS 0 – before 26.3.1 (a)0 – before 26.3.2 (a)0 – before 26.4
Apple visionOS 0 – before 26.4

Weakness: CWE-20, CWE-346 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

References