RLSA-2026:65158

    Dashboard / Vulnerabilities / RLSA-2026:65158

    RLSA-2026:65158

    Published: 9 Sept 2026Last Modified: 9 Sept 2026

    Summary: Important: thunderbird security update

    Details: Mozilla Thunderbird is a standalone mail and newsgroup client. Security Fix(es): * firefox: thunderbird: Site isolation issue in the Graphics: CanvasWebGL component (CVE-2026-74934) * firefox: thunderbird: Internally found bugs fixed in Firefox ESR 140.14, Firefox ESR 153.1 and Firefox 154 (CVE-2026-74987) * firefox: thunderbird: Use-after-free in the Graphics: ImageLib component (CVE-2026-74943) * firefox: thunderbird: Information disclosure in the DOM: UI Events & Focus Handling component (CVE-2026-74971) * firefox: Privilege escalation in the Shell Integration component (CVE-2026-74965) * firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-74946) * firefox: Race condition, use-after-free in the Graphics component (CVE-2026-74973) * firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: Canvas2D component (CVE-2026-74949) * firefox: thunderbird: Internally found bugs fixed in Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1 and Firefox 154 (CVE-2026-74990) * firefox: thunderbird: Use-after-free in the Graphics: Text component (CVE-2026-74940) * firefox: thunderbird: Site isolation issue in the WebExtensions component (CVE-2026-74960) * firefox: thunderbird: Mitigation bypass in the Storage: Cache API component (CVE-2026-74959) * firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-74976) * firefox: thunderbird: Same-origin policy bypass in the Graphics: ImageLib component (CVE-2026-74974) * firefox: thunderbird: Mitigation bypass in the Safe Browsing component (CVE-2026-74957) * firefox: Privilege escalation in the Remote Settings Client component (CVE-2026-74942) * firefox: thunderbird: Privilege escalation in the DOM: Navigation component (CVE-2026-74939) * firefox: thunderbird: Information disclosure in the DOM: Push Subscriptions component (CVE-2026-74972) * firefox: thunderbird: Information disclosure in the Graphics: Text component (CVE-2026-74945) * firefox: thunderbird: Same-origin policy bypass in the Networking: Cookies component (CVE-2026-74963) * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-74944) * firefox: Site isolation issue in the Networking: Cookies component (CVE-2026-74962) * firefox: thunderbird: Privilege escalation in the DOM: Networking component (CVE-2026-74935) 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-2026:65158, https://bugzilla.redhat.com/show_bug.cgi?id=2517820, https://bugzilla.redhat.com/show_bug.cgi?id=2517823, https://bugzilla.redhat.com/show_bug.cgi?id=2517826, https://bugzilla.redhat.com/show_bug.cgi?id=2517831, https://bugzilla.redhat.com/show_bug.cgi?id=2517834, https://bugzilla.redhat.com/show_bug.cgi?id=2517835, https://bugzilla.redhat.com/show_bug.cgi?id=2517836, https://bugzilla.redhat.com/show_bug.cgi?id=2517837, https://bugzilla.redhat.com/show_bug.cgi?id=2517839, https://bugzilla.redhat.com/show_bug.cgi?id=2517841, https://bugzilla.redhat.com/show_bug.cgi?id=2517845, https://bugzilla.redhat.com/show_bug.cgi?id=2517849, https://bugzilla.redhat.com/show_bug.cgi?id=2517851, https://bugzilla.redhat.com/show_bug.cgi?id=2517853, https://bugzilla.redhat.com/show_bug.cgi?id=2517856, https://bugzilla.redhat.com/show_bug.cgi?id=2517859, https://bugzilla.redhat.com/show_bug.cgi?id=2517860, https://bugzilla.redhat.com/show_bug.cgi?id=2517862, https://bugzilla.redhat.com/show_bug.cgi?id=2517863, https://bugzilla.redhat.com/show_bug.cgi?id=2517866, https://bugzilla.redhat.com/show_bug.cgi?id=2517868, https://bugzilla.redhat.com/show_bug.cgi?id=2517872, https://bugzilla.redhat.com/show_bug.cgi?id=2517874, https://access.redhat.com/errata/RHSA-2026:65158

    Affected packages

    Package

    Name: thunderbird

    Purl: pkg:rpm/rocky-linux/thunderbird?distro=rocky-linux-9&epoch=0

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -0:140.14.0-1.el9_8

    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-2026:65158 | CVE-DB