The issue was addressed with improved memory handling. This issue is fixed in watchOS 26.3, tvOS 26.3, macOS Tahoe 26.3, iOS 18.7.5 and iPadOS 18.7.5, visionOS 26.3, iOS 26.3 and iPadOS 26.3, Safari 26.3. Processing maliciously crafted web content may lead to an unexpected process crash.

The remote Debian 12 / 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6172 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6172-1                   security@debian.org     https://www.debian.org/security/                           Alberto Garcia     March 21, 2026                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : webkit2gtk     CVE ID         : CVE-2025-43214 CVE-2025-43457 CVE-2025-43511 CVE-2026-20608                      CVE-2026-20635 CVE-2026-20636 CVE-2026-20644 CVE-2026-20652                      CVE-2026-20676

    The following vulnerabilities have been discovered in the WebKitGTK     web engine:

    CVE-2025-43214

        shandikri discovered that processing maliciously crafted web         content may lead to an unexpected process crash.

    CVE-2025-43457

         Gary Kwong and Hossein Lotfi discovered that processing          maliciously crafted web content may lead to an unexpected process          crash.

    CVE-2025-43511

        Lee Dong Ha discovered that processing maliciously crafted web         content may lead to an unexpected process crash.

    CVE-2026-20608

        HanQing and Nan Wang discovered that processing maliciously         crafted web content may lead to an unexpected process crash.

    CVE-2026-20635

        EntryHi discovered that processing maliciously crafted web content         may lead to an unexpected process crash.

    CVE-2026-20636

        EntryHi discovered that processing maliciously crafted web content         may lead to an unexpected process crash.

    CVE-2026-20644

        HanQing and Nan Wang discovered that processing maliciously         crafted web content may lead to an unexpected process crash.

    CVE-2026-20652

        Nathaniel Oh discovered that a remote attacker may be able to         cause a denial-of-service.

    CVE-2026-20676

        Tom Van Goethem discovered that a website may be able to track         users through web extensions.

    For the oldstable distribution (bookworm), these problems have been fixed     in version 2.50.6-1~deb12u1.

    For the stable distribution (trixie), these problems have been fixed in     version 2.50.6-1~deb13u1.

    We recommend that you upgrade your webkit2gtk packages.

    For the detailed security status of webkit2gtk please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/webkit2gtk

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian 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 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 watchOS 26.3, tvOS 26.3,     macOS Tahoe 26.3, iOS 18.7.5 and iPadOS 18.7.5, visionOS 26.3, iOS 26.3 and iPadOS 26.3, Safari 26.3.
    Processing maliciously crafted web content may lead to an unexpected process crash. (CVE-2026-20635)

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

According to its banner, the version of Apple TV on the remote device is prior to 26.3. It is therefore affected by multiple vulnerabilities as described in the 126351

The remote host is running a version of macOS / Mac OS X that is 26.x prior to 26.3. It is, therefore, affected by multiple vulnerabilities:

  - A race condition was addressed with improved handling of symbolic links. This issue is fixed in macOS     Tahoe 26.3, macOS Sonoma 14.8.4, iOS 18.7.5 and iPadOS 18.7.5, visionOS 26.3, iOS 26.3 and iPadOS 26.3. A     shortcut may be able to bypass sandbox restrictions. (CVE-2026-20677)

  - A path handling issue was addressed with improved logic. This issue is fixed in macOS Tahoe 26.3, macOS     Sonoma 14.8.4, iOS 18.7.5 and iPadOS 18.7.5, visionOS 26.3, iOS 26.3 and iPadOS 26.3, Safari 26.3. A     remote user may be able to write arbitrary files. (CVE-2026-20660)

  - libexpat in Expat before 2.7.2 allows attackers to trigger large dynamic memory allocations via a small     document that is submitted for parsing. (CVE-2025-59375)

  - A permissions issue was addressed with additional restrictions. This issue is fixed in macOS Tahoe 26.3.
    An app may be able to monitor keystrokes without user permission. (CVE-2026-20601)

  - The issue was addressed with improved handling of caches. This issue is fixed in macOS Sequoia 15.7.4,     macOS Tahoe 26.3, macOS Sonoma 14.8.4. An app may be able to cause a denial-of-service. (CVE-2026-20602)

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

The version of Apple iOS running on the mobile device is prior to 26.3. It is, therefore, affected by multiple vulnerabilities.

The version of Apple iOS running on the mobile device is prior to 18.7.5. It is, therefore, affected by multiple vulnerabilities.

ID	Name	Product	Family	Severity
303253	Debian dsa-6172 : gir1.2-javascriptcoregtk-4.0 - security update	Nessus	Debian Local Security Checks	medium
303061	Linux Distros Unpatched Vulnerability : CVE-2026-20635	Nessus	Misc.	medium
299008	Apple TV < 26.3 Multiple Vulnerabilities (126351)	Nessus	Misc.	high
298694	macOS 26.x < 26.3 Multiple Vulnerabilities (126348)	Nessus	MacOS X Local Security Checks	critical
298693	Apple iOS < 26.3 Multiple Vulnerabilities (126346)	Nessus	Mobile Devices	critical
298674	Apple iOS < 18.7.5 Multiple Vulnerabilities (126347)	Nessus	Mobile Devices	critical

Detections

Analytics

CVE-2026-20635

medium

Tenable Plugins

medium

medium

high

critical

critical

critical