Red Hat Product Errata RHSA-2026:19468 - Security Advisory Issued: 2026-05-20 Updated: 2026-05-20 RHSA-2026:19468 - Security Advisory Overview Updated Packages Synopsis Important: thunderbird security update Type/Severity Security Advisory: Important Red Hat Lightspeed patch analysis Identify and remediate systems affected by this advisory. View affected systems Topic An update for thunderbird is now available for Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. Description Mozilla Thunderbird is a standalone mail and newsgroup client. Security Fix(es): firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS (CVE-2026-6772) firefox: thunderbird: Use-after-free in the JavaScript Engine component (CVE-2026-6754) firefox: thunderbird: Spoofing issue in the DOM: Core & HTML component (CVE-2026-6762) firefox: thunderbird: Incorrect boundary conditions in the WebRTC component (CVE-2026-6752) firefox: thunderbird: Other issue in the Storage: IndexedDB component (CVE-2026-6770) firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component (CVE-2026-6757) firefox: thunderbird: Other issue in the Libraries component in NSS (CVE-2026-6767) firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150 (CVE-2026-6786) firefox: thunderbird: Incorrect boundary conditions in the WebRTC component (CVE-2026-6753) firefox: thunderbird: Use-after-free in the Widget: Cocoa component (CVE-2026-6759) firefox: thunderbird: Use-after-free in the WebRTC component (CVE-2026-6747) firefox: thunderbird: Information disclosure due to uninitialized memory in the Graphics: Canvas2D component (CVE-2026-6749) firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS (CVE-2026-6766) firefox: thunderbird: Privilege escalation in the Networking component (CVE-2026-6761) firefox: thunderbird: Mitigation bypass in the File Handling component (CVE-2026-6763) firefox: thunderbird: Privilege escalation in the Graphics: WebRender component (CVE-2026-6750) firefox: thunderbird: Uninitialized memory in the Audio/Video: Web Codecs component (CVE-2026-6748) firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150 (CVE-2026-6785) firefox: thunderbird: Mitigation bypass in the DOM: Security component (CVE-2026-6771) firefox: thunderbird: Incorrect boundary conditions in the DOM: Device Interfaces component (CVE-2026-6764) firefox: thunderbird: Information disclosure in the Form Autofill component (CVE-2026-6765) firefox: thunderbird: Privilege escalation in the Debugger component (CVE-2026-6769) firefox: thunderbird: Uninitialized memory in the Audio/Video: Web Codecs component (CVE-2026-6751) firefox: thunderbird: Incorrect boundary conditions in the WebRTC: Networking component (CVE-2026-6776) firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-6746) 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. Solution For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Affected Products Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.0 ppc64le Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.0 x86_64 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.0 aarch64 Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.0 s390x Fixes BZ - 2460074 - CVE-2026-6772 firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS BZ - 2460075 - CVE-2026-6754 firefox: thunderbird: Use-after-free in the JavaScript Engine component BZ - 2460076 - CVE-2026-6762 firefox: thunderbird: Spoofing issue in the DOM: Core & HTML component BZ - 2460078 - CVE-2026-6752 firefox: thunderbird: Incorrect boundary conditions in the WebRTC component BZ - 2460079 - CVE-2026-6770 firefox: thunderbird: Other issue in the Storage: IndexedDB component BZ - 2460085 - CVE-2026-6757 firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component BZ - 2460086 - CVE-2026-6767 firefox: thunderbird: Other issue in the Libraries component in NSS BZ - 2460088 - CVE-2026-6786 firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150 BZ - 2460092 - CVE-2026-6753 firefox: thunderbird: Incorrect boundary conditions in the WebRTC component BZ - 2460094 - CVE-2026-6759 firefox: thunderbird: Use-after-free in the Widget: Cocoa component BZ - 2460095 - CVE-2026-6747 firefox: thunderbird: Use-after-free in the WebRTC component BZ - 2460096 - CVE-2026-6749 firefox: thunderbird: Information disclosure due to uninitialized memory in the Graphics: Canvas2D component BZ - 2460097 - CVE-2026-6766 firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS BZ - 2460099 - CVE-2026-6761 firefox: thunderbird: Privilege escalation in the Networking component BZ - 2460101 - CVE-2026-6763 firefox: thunderbird: Mitigation bypass in the File Handling component BZ - 2460102 - CVE-2026-6750 firefox: thunderbird: Privilege escalation in the Graphics: WebRender component BZ - 2460103 - CVE-2026-6748 firefox: thunderbird: Uninitialized memory in the Audio/Video: Web Codecs component BZ - 2460104 - CVE-2026-6785 firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150 BZ - 2460105 - CVE-2026-6771 firefox: thunderbird: Mitigation bypass in the DOM: Security component BZ - 2460106 - CVE-2026-6764 firefox: thunderbird: Incorrect boundary conditions in the DOM: Device Interfaces component BZ - 2460107 - CVE-2026-6765 firefox: thunderbird: Information disclosure in the Form Autofill component BZ - 2460108 - CVE-2026-6769 firefox: thunderbird: Privilege escalation in the Debugger component BZ - 2460109 - CVE-2026-6751 firefox: thunderbird: Uninitialized memory in the Audio/Video: Web Codecs component BZ - 2460110 - CVE-2026-6776 firefox: thunderbird: Incorrect boundary conditions in the WebRTC: Networking component BZ - 2460112 - CVE-2026-6746 firefox: thunderbird: Use-after-free in the DOM: Core & HTML component CVEs CVE-2026-6746 CVE-2026-6747 CVE-2026-6748 CVE-2026-6749 CVE-2026-6750 CVE-2026-6751 CVE-2026-6752 CVE-2026-6753 CVE-2026-6754 CVE-2026-6757 CVE-2026-6759 CVE-2026-6761 CVE-2026-6762 CVE-2026-6763 CVE-2026-6764 CVE-2026-6765 CVE-2026-6766 CVE-2026-6767 CVE-2026-6769 CVE-2026-6770 CVE-2026-6771 CVE-2026-6772 CVE-2026-6776 CVE-2026-6785 CVE-2026-6786 References https://access.redhat.com/security/updates/classification/#important Note: More recent versions of these packages may be available. Click a package name for more details. Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.0 SRPM thunderbird-140.10.0-1.el9_0.src.rpm SHA-256: 70eb8316e8a3a6023d89b76fc505d4f6cf08745fcecf3f6c44824a1a53fa802e ppc64le thunderbird-140.10.0-1.el9_0.ppc64le.rpm SHA-256: b1f36a444b516adba3a9b4f11e07b0f2c1eddd79482b563adbc770ebf323984c thunderbird-debuginfo-140.10.0-1.el9_0.ppc64le.rpm SHA-256: 72770abc3f431d91dc3636c13cc46f65e3fd9717c0bbc73266ecd5eedb054b3a thunderbird-debugsource-140.10.0-1.el9_0.ppc64le.rpm SHA-256: 708525889cb2fddca548063d6d7b69ba31482fc932f82f12fcd9718e23487e6c Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.0 SRPM thunderbird-140.10.0-1.el9_0.src.rpm SHA-256: 70eb8316e8a3a6023d89b76fc505d4f6cf08745fcecf3f6c44824a1a53fa802e x86_64 thunderbird-140.10.0-1.el9_0.x86_64.rpm SHA-256: afadd0d6f805e58cbbd1890aa3c1750db5bfc24733e1fb50b32853876a1f8c90 thunderbird-debuginfo-140.10.0-1.el9_0.x86_64.rpm SHA-256: 721a329fdbbe6d1f8cf2e93cddadc34b6a11250a329bd5a874c5e0be25673db3 thunderbird-debugsource-140.10.0-1.el9_0.x86_64.rpm SHA-256: dbb7a7ec38239a679d3fab995b34949bc4e29d927b5fc64b03adc40aa977a549 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.0 SRPM thunderbird-140.10.0-1.el9_0.src.rpm SHA-256: 70eb8316e8a3a6023d89b76fc505d4f6cf08745fcecf3f6c44824a1a53fa802e aarch64 thunderbird-140.10.0-1.el9_0.aarch64.rpm SHA-256: b96c421198179d3bd6d4f067982f7ede8f2bfe320072bd926cb5a2cba51fc156 thunderbird-debuginfo-140.10.0-1.el9_0.aarch64.rpm SHA-256: 208e1d05b3e0b454d7b9f3c1c41f83f1993877295832b14182cadc0301e9e1fb thunderbird-debugsource-140.10.0-1.el9_0.aarch64.rpm SHA-256: 2855c5e9807ae2f813f98284b3d11c889c1dab2cdc970cb2c7bf41f82b3921dc Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.0 SRPM thunderbird-140.10.0-1.el9_0.src.rpm SHA-256: 70eb8316e8a3a6023d89b76fc505d4f6cf08745fcecf3f6c44824a1a53fa802e s390x thunderbird-140.10.0-1.el9_0.s390x.rpm SHA-256: b988b1745cc10394ed850242a131643d49fa03fb20a5613fe458ccfd4c4548b4 thunderbird-debuginfo-140.10.0-1.el9_0.s390x.rpm SHA-256: 11da488c205f405520363e18c43767fa7123c4f5566844a8c189d2979469f632 thunderbird-debugsource-140.10.0-1.el9_0.s390x.rpm SHA-256: aeb48d99435cc9f44b88212cd9270758b283af2f9780cf35573591547efbe0bd The Red Hat security contact is secalert@redhat.com . More contact details at https://access.redhat.com/security/team/contact/ .