RLSA-2026:90913

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    RLSA-2026:90913

    Published: 29 Oct 2026Last Modified: 29 Oct 2026

    Summary: Important: thunderbird security update

    Details: Mozilla Thunderbird is a standalone mail and newsgroup client. Security Fix(es): * firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Graphics component (CVE-2026-92035) * firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100832) * firefox: Use-after-free in the Layout: Text and Fonts component (CVE-2026-100784) * firefox: thunderbird: Privilege escalation in the DLL Services component (CVE-2026-100801) * firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Internationalization component (CVE-2026-100794) * firefox: thunderbird: Privilege escalation in the Address Bar component (CVE-2026-100820) * firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100777) * firefox: thunderbird: Information disclosure in the Networking: JAR component (CVE-2026-100766) * firefox: thunderbird: Use-after-free in the XSLT component (CVE-2026-100779) * firefox: thunderbird: Privilege escalation in the DOM: Service Workers component (CVE-2026-100807) * firefox: thunderbird: JIT miscompilation in the JavaScript: WebAssembly component (CVE-2026-100792) * firefox: Privilege escalation due to use-after-free in the Graphics: WebRender component (CVE-2026-100797) * firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the XPCOM component (CVE-2026-100819) * firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-100776) * firefox: thunderbird: Use-after-free in the Widget component (CVE-2026-100757) * firefox: Sandbox escape due to use-after-free in the Graphics component (CVE-2026-100786) * firefox: thunderbird: Information disclosure in the Networking component (CVE-2026-96869) * firefox: Sandbox escape due to use-after-free in the DOM: Content Processes component (CVE-2026-100770) * firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-100769) * firefox: Use-after-free in the DOM: Core & HTML component (CVE-2026-100791) * firefox: thunderbird: Sandbox escape due to use-after-free in the Widget: Gtk component (CVE-2026-100818) * firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics component (CVE-2026-100782) * firefox: firefox: Sandbox escape via use-after-free in DOM component (CVE-2026-100811) * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-100772) * firefox: thunderbird: Uninitialized memory in the Storage: Quota Manager component (CVE-2026-100759) * firefox: Sandbox escape due to use-after-free in the DOM: Core & HTML component (CVE-2026-100778) * firefox: thunderbird: Sandbox escape in the DOM: Navigation component (CVE-2026-100758) * firefox: thunderbird: Sandbox escape in the Graphics component (CVE-2026-100775) * firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component (CVE-2026-100781) * firefox: Use-after-free in the DOM: Core & HTML component (CVE-2026-100774) * firefox: thunderbird: Same-origin policy bypass in the WebExtensions component (CVE-2026-100803) * firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100789) * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-100785) * firefox: thunderbird: Site isolation issue in the Panning and Zooming component (CVE-2026-100821) * firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component (CVE-2026-100788) * firefox: thunderbird: Undefined behavior in the DOM: Streams component (CVE-2026-100771) * firefox: Sandbox escape due to use-after-free in the DOM: Content Processes component (CVE-2026-100762) * firefox: thunderbird: Use-after-free in the XSLT component (CVE-2026-100790) * firefox: thunderbird: Use-after-free in the Storage: IndexedDB component (CVE-2026-100773) * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-100780) * firefox: thunderbird: Use-after-free in the Networking: Cache component (CVE-2026-100767) * firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component (CVE-2026-100756) * firefox: thunderbird: Uninitialized memory in the Audio/Video component (CVE-2026-100783) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

    References: https://errata.rockylinux.org/RLSA-2026:90913, https://bugzilla.redhat.com/show_bug.cgi?id=2533789, https://bugzilla.redhat.com/show_bug.cgi?id=2543113, https://bugzilla.redhat.com/show_bug.cgi?id=2543114, https://bugzilla.redhat.com/show_bug.cgi?id=2543116, https://bugzilla.redhat.com/show_bug.cgi?id=2543120, https://bugzilla.redhat.com/show_bug.cgi?id=2543121, https://bugzilla.redhat.com/show_bug.cgi?id=2543123, https://bugzilla.redhat.com/show_bug.cgi?id=2543125, https://bugzilla.redhat.com/show_bug.cgi?id=2543128, https://bugzilla.redhat.com/show_bug.cgi?id=2543130, https://bugzilla.redhat.com/show_bug.cgi?id=2543131, https://bugzilla.redhat.com/show_bug.cgi?id=2543133, https://bugzilla.redhat.com/show_bug.cgi?id=2543134, https://bugzilla.redhat.com/show_bug.cgi?id=2543137, https://bugzilla.redhat.com/show_bug.cgi?id=2543140, https://bugzilla.redhat.com/show_bug.cgi?id=2543142, https://bugzilla.redhat.com/show_bug.cgi?id=2543144, https://bugzilla.redhat.com/show_bug.cgi?id=2543145, https://bugzilla.redhat.com/show_bug.cgi?id=2543146, https://bugzilla.redhat.com/show_bug.cgi?id=2543149, https://bugzilla.redhat.com/show_bug.cgi?id=2543150, https://bugzilla.redhat.com/show_bug.cgi?id=2543152, https://bugzilla.redhat.com/show_bug.cgi?id=2543154, https://bugzilla.redhat.com/show_bug.cgi?id=2543155, https://bugzilla.redhat.com/show_bug.cgi?id=2543156, https://bugzilla.redhat.com/show_bug.cgi?id=2543157, https://bugzilla.redhat.com/show_bug.cgi?id=2543159, https://bugzilla.redhat.com/show_bug.cgi?id=2543160, https://bugzilla.redhat.com/show_bug.cgi?id=2543161, https://bugzilla.redhat.com/show_bug.cgi?id=2543163, https://bugzilla.redhat.com/show_bug.cgi?id=2543164, https://bugzilla.redhat.com/show_bug.cgi?id=2543166, https://bugzilla.redhat.com/show_bug.cgi?id=2543167, https://bugzilla.redhat.com/show_bug.cgi?id=2543172, https://bugzilla.redhat.com/show_bug.cgi?id=2543174, https://bugzilla.redhat.com/show_bug.cgi?id=2543177, https://bugzilla.redhat.com/show_bug.cgi?id=2543182, https://bugzilla.redhat.com/show_bug.cgi?id=2543183, https://bugzilla.redhat.com/show_bug.cgi?id=2543185, https://bugzilla.redhat.com/show_bug.cgi?id=2543187, https://bugzilla.redhat.com/show_bug.cgi?id=2543188, https://bugzilla.redhat.com/show_bug.cgi?id=2543192, https://bugzilla.redhat.com/show_bug.cgi?id=2543193, https://access.redhat.com/errata/RHSA-2026:90913

    Affected packages

    Package

    Name: thunderbird

    Purl: pkg:rpm/rocky-linux/thunderbird?distro=rocky-linux-8&epoch=0

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -0:140.17.0-1.el8_10

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    RLSA-2026:90913 | CVE-DB