A use-after-free issue was addressed with improved memory management. This issue is fixed in Safari 26.6, iOS 26.6 and iPadOS 26.6, macOS Tahoe 26.6, visionOS 26.6, watchOS 26.6. Processing maliciously crafted web content may lead to an unexpected Safari crash.

The version of webkitgtk4 installed on the remote host is prior to 2.52.6-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3891 advisory.

    The issue was addressed with improved memory handling. This issue is fixed in iOS 18.7.10 and iPadOS     18.7.10. Processing maliciously crafted web content may lead to an unexpected Safari crash.
    (CVE-2026-28984)

    This issue was addressed through improved state management. This issue is fixed in Safari 26.6, iOS 26.6     and iPadOS 26.6, macOS Tahoe 26.6, visionOS 26.6. Visiting a website may lead to an app denial-of-service.
    (CVE-2026-43804)

    This issue was addressed with improved checks. This issue is fixed in Safari 26.6, iOS 26.6 and iPadOS     26.6, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6, watchOS 26.6. Websites may know if the user has visited     a given link. (CVE-2026-64713)

    An out-of-bounds access issue was addressed with improved bounds checking. This issue is fixed in Safari     26.6, iOS 18.7.10 and iPadOS 18.7.10, iOS 26.6 and iPadOS 26.6, macOS Tahoe 26.6, tvOS 26.6, visionOS     26.6, watchOS 26.6. Processing maliciously crafted web content may lead to an unexpected Safari crash.
    (CVE-2026-64719)

    A permissions issue was addressed with improved validation. This issue is fixed in Safari 26.6, iOS 26.6     and iPadOS 26.6, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6, watchOS 26.6. Maliciously crafted web content     may violate iframe sandboxing policy. (CVE-2026-64728)

    The issue was addressed with improved UI. This issue is fixed in Safari 26.6, iOS 26.6 and iPadOS 26.6,     macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6, watchOS 26.6. Visiting a website that frames malicious content     may lead to UI spoofing. (CVE-2026-64730)

    A memory corruption issue was addressed with improved state management. This issue is fixed in Safari     26.6, iOS 26.6 and iPadOS 26.6, macOS Tahoe 26.6, visionOS 26.6, watchOS 26.6. Processing maliciously     crafted web content may lead to an unexpected Safari crash. (CVE-2026-64757)

    A use-after-free issue was addressed with improved memory management. This issue is fixed in Safari 26.6,     iOS 26.6 and iPadOS 26.6, macOS Tahoe 26.6, visionOS 26.6, watchOS 26.6. Processing maliciously crafted     web content may lead to an unexpected Safari crash. (CVE-2026-64783)

    A use-after-free issue was addressed with improved memory management. This issue is fixed in Safari     26.6.1, iOS 26.6.1 and iPadOS 26.6.1, macOS Tahoe 26.6.2. Processing maliciously crafted web content may     lead to an unexpected process termination. (CVE-2026-64787)

Tenable has extracted the preceding description block directly from the tested product 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 remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6463 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6463-1                   security@debian.org     https://www.debian.org/security/                           Alberto Garcia     August 24, 2026                       https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : webkit2gtk     CVE ID         : CVE-2026-43804 CVE-2026-64713 CVE-2026-64719 CVE-2026-64728                      CVE-2026-64730 CVE-2026-64757 CVE-2026-64783

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

    CVE-2026-43804

        Heiko Kiesel discovered that visiting a website may lead to an app         denial-of-service.

    CVE-2026-64713

        Kwak Kiyong and Song Nuri discovered that websites may know if the         user has visited a given link.

    CVE-2026-64719

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

    CVE-2026-64728

        An anonymous researcher discovered that maliciously crafted web         content may violate iframe sandboxing policy.

    CVE-2026-64730

        Kagami Rosylight discovered that visiting a website that frames         malicious content may lead to UI spoofing.

    CVE-2026-64757

        Milad Nasr and Nicholas Carlini discovered that processing         maliciously crafted web content may lead to an unexpected process         crash.

    CVE-2026-64783

        lattice, Behzad Najjarpour Jabbari, Junyeong Lee, OGINOME         Tomohito, Gia Bui and others discovered that processing         maliciously crafted web content may lead to an unexpected process         crash.

    For the stable distribution (trixie), these problems have been fixed in     version 2.52.6-1~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.

  - A use-after-free issue was addressed with improved memory management. This issue is fixed in Safari 26.6,     iOS 26.6 and iPadOS 26.6, macOS Tahoe 26.6, visionOS 26.6, watchOS 26.6. Processing maliciously crafted     web content may lead to an unexpected Safari crash. (CVE-2026-64783)

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

The version of Apple iOS running on the mobile device is prior to 26.6. 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 26.6. It is, therefore, affected by multiple vulnerabilities:

  - A use-after-free issue was addressed with improved memory management. This issue is fixed in Safari 26.6,     iOS 26.6 and iPadOS 26.6, macOS Tahoe 26.6, visionOS 26.6, watchOS 26.6. Processing maliciously crafted     web content may lead to an unexpected Safari crash. (CVE-2026-64783)

  - A memory initialization issue was addressed with improved memory handling. This issue is fixed in iOS 26.6     and iPadOS 26.6, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6,     watchOS 26.6. An app may be able to cause unexpected system termination. (CVE-2026-64775)

  - Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol. This issue     affects Apache HTTP Server: 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the     issue. (CVE-2026-23918)

  - The issue was addressed with improved memory handling. This issue is fixed in macOS Sonoma 14.8.8, macOS     Tahoe 26.6. A malicious app may be able to corrupt memory of a system process. (CVE-2026-28911)

  - A logic issue was addressed with improved restrictions. This issue is fixed in macOS Sequoia 15.7.8, macOS     Tahoe 26.6. A user may be able to elevate privileges. (CVE-2026-28912)

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	Type	Severity
341901	Amazon Linux 2 : webkitgtk4, --advisory ALAS2-2026-3891 (ALAS-2026-3891)	Nessus	Amazon Linux Local Security Checks	Local	high
339163	Debian dsa-6463 : gir1.2-javascriptcoregtk-4.1 - security update	Nessus	Debian Local Security Checks	Local	high
338297	Linux Distros Unpatched Vulnerability : CVE-2026-64783	Nessus	Misc.	Local	high
330150	Apple iOS < 26.6 Multiple Vulnerabilities (128066)	Nessus	Mobile Devices	Local	critical
330144	macOS 26.x < 26.6 Multiple Vulnerabilities (128067)	Nessus	MacOS X Local Security Checks	Local	critical

Detections

Analytics

CVE-2026-64783

high

Tenable Plugins

high

high

high

critical

critical