This issue was addressed through improved state management. This issue is fixed in Safari 26.4, iOS 18.7.7 and iPadOS 18.7.7, iOS 26.4 and iPadOS 26.4, macOS Tahoe 26.4, tvOS 26.4, visionOS 26.4, watchOS 26.4. Processing maliciously crafted web content may prevent Content Security Policy from being enforced.

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-36594550b0 advisory.

    Update to 2.52.1.

    Notable changes from 2.50 to 2.52:

     * Make text look like in other browsers by blending in linear color space.
     * Improved rendering performance by using a different tile size depending on whether GPU rendering is     enabled or not.
     * Improved composition scheduling to avoid blocking waiting for tile painting.
     * Improved performance of accelerated 2D canvas by recording operations for batched replay.
     * Improved async scrolling when main thread is busy by avoiding locks and rendering the scrollbars from     the scrolling thread.
     * Enabled dynamic MSAA for accelerated 2D canvas rendering.
     * Improved text rendering performance
     * Videos with BT2100-PQ colorspace are now tone-mapped to SDR, ensuring colours do not appear washed out.
     * Added support for the Audio Output Devices API.
     * Added API to handle WebXR permission requests.
     * Added API to query the immersive session status.
     * Added initial API for web extensions.

    Additional changes from 2.52.0 to 2.52.1:

     * Reduce the amount of useless MPRIS notifications produced by MediaSesion when the information about     media being played is incomplete.
     * Add Sysprof marks for mouse events.
     * Fix MediaSession icon for iheart.com not being displayed.
     * Fix several crashes and rendering issues.
     * Translation updates: Georgian.


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 remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-431948187d advisory.

    Update to 2.52.1.

    Notable changes from 2.50 to 2.52:

     * Make text look like in other browsers by blending in linear color space.
     * Improved rendering performance by using a different tile size depending on whether GPU rendering is     enabled or not.
     * Improved composition scheduling to avoid blocking waiting for tile painting.
     * Improved performance of accelerated 2D canvas by recording operations for batched replay.
     * Improved async scrolling when main thread is busy by avoiding locks and rendering the scrollbars from     the scrolling thread.
     * Enabled dynamic MSAA for accelerated 2D canvas rendering.
     * Improved text rendering performance
     * Videos with BT2100-PQ colorspace are now tone-mapped to SDR, ensuring colours do not appear washed out.
     * Added support for the Audio Output Devices API.
     * Added API to handle WebXR permission requests.
     * Added API to query the immersive session status.
     * Added initial API for web extensions.

    Additional changes from 2.52.0 to 2.52.1:

     * Reduce the amount of useless MPRIS notifications produced by MediaSesion when the information about     media being played is incomplete.
     * Add Sysprof marks for mouse events.
     * Fix MediaSession icon for iheart.com not being displayed.
     * Fix several crashes and rendering issues.
     * Translation updates: Georgian.


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 remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-f00460a7d9 advisory.

    Update to 2.52.1:

     * Reduce the amount of useless MPRIS notifications produced by MediaSesion when the information about     media being played is incomplete.
     * Add Sysprof marks for mouse events.
     * Fix MediaSession icon for iheart.com not being displayed.
     * Fix several crashes and rendering issues.
     * Translation updates: Georgian.

    ----

    Update to 2.52.0:

     * Make text look like in other browsers by blending in linear color space.
     * Improved rendering performance by using a different tile size depending on whether GPU rendering is     enabled or not.
     * Improved composition scheduling to avoid blocking waiting for tile painting.
     * Improved performance of accelerated 2D canvas by recording operations for batched replay.
     * Improved async scrolling when main thread is busy by avoiding locks and rendering the scrollbars from     the scrolling thread.
     * Enabled dynamic MSAA for accelerated 2D canvas rendering.
     * Improved text rendering performance
     * Videos with BT2100-PQ colorspace are now tone-mapped to SDR, ensuring colours do not appear washed out.
     * Added support for the Audio Output Devices API.
     * Added API to handle WebXR permission requests.
     * Added API to query the immersive session status.
     * Added initial API for web extensions.

    ----

    2.51.93:

     * Make text look like in other browsers by blending in linear color space.
     * Avoid composition for non visible layers with running animations.
     * Fix several crashes and rendering issues.


    ----

    2.51.92:

     * Fix PDF rendering broken by the accelerated 2D canvas performance improvements.
     * Fix flickering while scrolling in some edge cases.
     * Support for rotation and mirroring in internal WebCodecs encoder.
     * System fallback font selection no longer takes style into account.
     * Fix several crashes and rendering issues.





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

  - This issue was addressed through improved state management. This issue is fixed in Safari 26.4, iOS 18.7.7     and iPadOS 18.7.7, iOS 26.4 and iPadOS 26.4, macOS Tahoe 26.4, tvOS 26.4, visionOS 26.4, watchOS 26.4.
    Processing maliciously crafted web content may prevent Content Security Policy from being enforced.
    (CVE-2026-20665)

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 26.4. 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 26.4. It is, therefore, affected by multiple vulnerabilities:

  - Apache HTTP Server 2.4.65 and earlier with Server Side Includes (SSI) enabled and mod_cgid (but not     mod_cgi) passes the shell-escaped query string to #exec cmd=... directives. This issue affects Apache     HTTP Server before 2.4.66. Users are recommended to upgrade to version 2.4.66, which fixes the issue.
    (CVE-2025-58098)

  - When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer performs a cross-protocol     redirect to a second URL that uses an IMAP, LDAP, POP3 or SMTP scheme, curl might wrongly pass on the     bearer token to the new target host. (CVE-2025-14524)

  - An integer overflow in the case of failed ACME certificate renewal leads, after a number of failures (~30     days in default configurations), to the backoff timer becoming 0. Attempts to renew the certificate then     are repeated without delays until it succeeds. This issue affects Apache HTTP Server: from 2.4.30 before     2.4.66. Users are recommended to upgrade to version 2.4.66, which fixes the issue. (CVE-2025-55753)

  - Server-Side Request Forgery (SSRF) vulnerability in Apache HTTP Server on Windows with AllowEncodedSlashes     On and MergeSlashes Off allows to potentially leak NTLM hashes to a malicious server via SSRF and     malicious requests or content Users are recommended to upgrade to version 2.4.66, which fixes the issue.
    (CVE-2025-59775)

  - LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. Prior to version 1.6.51, a heap buffer over-read vulnerability     exists in libpng's png_do_quantize function when processing PNG files with malformed palette indices. The     vulnerability occurs when palette_lookup array bounds are not validated against externally-supplied image     data, allowing an attacker to craft a PNG file with out-of-range palette indices that trigger out-of-     bounds memory access. This issue has been patched in version 1.6.51. (CVE-2025-64505)

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 18.7.7. It is, therefore, affected by multiple vulnerabilities.

ID	Name	Product	Family	Severity
306478	Fedora 42 : webkitgtk (2026-36594550b0)	Nessus	Fedora Local Security Checks	medium
306476	Fedora 43 : webkitgtk (2026-431948187d)	Nessus	Fedora Local Security Checks	medium
304343	Fedora 44 : webkitgtk (2026-f00460a7d9)	Nessus	Fedora Local Security Checks	medium
304065	Linux Distros Unpatched Vulnerability : CVE-2026-20665	Nessus	Misc.	medium
303482	Apple iOS < 26.4 Multiple Vulnerabilities (126792)	Nessus	Mobile Devices	high
303481	macOS 26.x < 26.4 Multiple Vulnerabilities (126794)	Nessus	MacOS X Local Security Checks	high
303480	Apple iOS < 18.7.7 Multiple Vulnerabilities (126793)	Nessus	Mobile Devices	high

Detections

Analytics

CVE-2026-20665

medium

Tenable Plugins

medium

medium

medium

medium

high

high

high