The issue was addressed with improved memory handling. This issue is fixed in Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2. Processing maliciously crafted web content may lead to an unexpected process crash.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - The issue was addressed with improved memory handling. This issue is fixed in Safari 26.5.2, iOS 26.5.2     and iPadOS 26.5.2, macOS Tahoe 26.5.2. Processing maliciously crafted web content may lead to an     unexpected process crash. (CVE-2026-43663)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-3bc4b3ccb3 advisory.

     * Fire scrollend event for instant programmatic scrolls.
     * Increase network idle connection timeout to 115 seconds.
     * Fix several crashes and rendering issues.
     * Fix CVE-2024-4367, CVE-2026-39872, CVE-2026-43663, CVE-2026-43676, CVE-2026-43699, CVE-2026-43701,     CVE-2026-43705, CVE-2026-43707, CVE-2026-43712, CVE-2026-43713, CVE-2026-43715, CVE-2026-43716,     CVE-2026-43720, CVE-2026-43721, CVE-2026-43725, CVE-2026-43726, CVE-2026-43727, CVE-2026-43731,     CVE-2026-43732, CVE-2026-43734, CVE-2026-43740, CVE-2026-43742, CVE-2026-43745

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Apple iOS running on the mobile device is prior to 26.5.2. It is, therefore, affected by multiple vulnerabilities.

The remote host is running a version of macOS / Mac OS X that is 26.x prior to 26.5.2. It is, therefore, affected by multiple vulnerabilities:

  - A use-after-free issue was addressed with improved memory management. This issue is fixed in Safari     26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2. Processing maliciously crafted web content may     lead to memory corruption. (CVE-2026-43715, CVE-2026-43731)

  - This issue was addressed with improved input validation. This issue is fixed in iOS 26.5.2 and iPadOS     26.5.2, macOS Tahoe 26.5.2. An app may be able to cause unexpected system termination or corrupt kernel     memory. (CVE-2026-39868)

  - An out-of-bounds access issue was addressed with improved bounds checking. This issue is fixed in Safari     26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2. Processing maliciously crafted web content may     lead to an unexpected process crash. (CVE-2026-28979)

  - The issue was addressed with improved memory handling. This issue is fixed in Safari 26.5.2, iOS 26.5.2     and iPadOS 26.5.2, macOS Tahoe 26.5.2. Processing maliciously crafted web content may lead to an     unexpected process crash. (CVE-2026-39872, CVE-2026-43663, CVE-2026-43712)

  - An out-of-bounds access issue was addressed with improved bounds checking. This issue is fixed in Safari     26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2. Processing maliciously crafted web content may     lead to an unexpected Safari crash. (CVE-2026-43676)

Note that Nessus has not tested for these issues but has instead relied only on the operating system's self-reported version number.

ID	Name	Product	Family	Severity
327459	Linux Distros Unpatched Vulnerability : CVE-2026-43663	Nessus	Misc.	medium
326390	Fedora 44 : webkitgtk (2026-3bc4b3ccb3)	Nessus	Fedora Local Security Checks	high
323674	Apple iOS < 26.5.2 Multiple Vulnerabilities (127594)	Nessus	Mobile Devices	critical
323673	macOS 26.x < 26.5.2 Multiple Vulnerabilities (127595)	Nessus	MacOS X Local Security Checks	critical

Detections

Analytics

CVE-2026-43663

medium

Tenable Plugins

medium

high

critical

critical