Red Hat Product Errata RHSA-2026:17690 - Security Advisory Issued: 2026-05-14 Updated: 2026-05-14 RHSA-2026:17690 - Security Advisory Overview Updated Packages Synopsis Important: firefox 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 firefox is now available for Red Hat Enterprise Linux 10.0 Extended Update Support. 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 Firefox is an open-source web browser, designed for standards compliance, performance, and portability. 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 for x86_64 - Extended Update Support 10.0 x86_64 Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 10.0 s390x Red Hat Enterprise Linux for Power, little endian - Extended Update Support 10.0 ppc64le Red Hat Enterprise Linux for ARM 64 - Extended Update Support 10.0 aarch64 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 10.0 aarch64 Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 10.0 s390x Red Hat Enterprise Linux for Power, little endian - 4 years of support 10.0 ppc64le Red Hat Enterprise Linux for x86_64 - 4 years of updates 10.0 x86_64 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 for x86_64 - Extended Update Support 10.0 SRPM firefox-140.10.0-1.el10_0.src.rpm SHA-256: cca3f8a639de6b6fa721e8c03584583eb23ac7fad56845b18be048ff52be1dc5 x86_64 firefox-140.10.0-1.el10_0.x86_64.rpm SHA-256: 99c037d9030227d6f281797178bf497ac44794c6634fe269658319eae74d4761 firefox-debuginfo-140.10.0-1.el10_0.x86_64.rpm SHA-256: cfbb6b5b569dcc3795ba97dc1690820a87fce73f483b5f4ad6a99af21570d6de firefox-debugsource-140.10.0-1.el10_0.x86_64.rpm SHA-256: dd78b5b2e321159c9a564b905684818fb9a5ad96e9d930c2dd7a6b7ef408ffda Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 10.0 SRPM firefox-140.10.0-1.el10_0.src.rpm SHA-256: cca3f8a639de6b6fa721e8c03584583eb23ac7fad56845b18be048ff52be1dc5 s390x firefox-140.10.0-1.el10_0.s390x.rpm SHA-256: dd9fb5c9ce79f9a251c23a7cf2b4ac59e5235dae853e26e484224737591ecdb7 firefox-debuginfo-140.10.0-1.el10_0.s390x.rpm SHA-256: 22f856f13046f663dc178e69054807d9e7c83515852226d1d1c98ab16c45ff03 firefox-debugsource-140.10.0-1.el10_0.s390x.rpm SHA-256: 79ab542bfd023d88a9ce15cdd30fdc5f3eb01b76a596c3d46776965c5bfd1c44 Red Hat Enterprise Linux for Power, little endian - Extended Update Support 10.0 SRPM firefox-140.10.0-1.el10_0.src.rpm SHA-256: cca3f8a639de6b6fa721e8c03584583eb23ac7fad56845b18be048ff52be1dc5 ppc64le firefox-140.10.0-1.el10_0.ppc64le.rpm SHA-256: d164ac17add8bb30fc9c0245ae9f369e00b16eaf73174ee604a6703d79c5c84a firefox-debuginfo-140.10.0-1.el10_0.ppc64le.rpm SHA-256: fb7b2c6969c37eb649e88a70cc973dde172a459d8404a2cfd61a2b26b301fb07 firefox-debugsource-140.10.0-1.el10_0.ppc64le.rpm SHA-256: 8a84bffb94e06d42cfdf78fb87b13fec2e986346476edcc6a432c22ae6bc29bf Red Hat Enterprise Linux for ARM 64 - Extended Update Support 10.0 SRPM firefox-140.10.0-1.el10_0.src.rpm SHA-256: cca3f8a639de6b6fa721e8c03584583eb23ac7fad56845b18be048ff52be1dc5 aarch64 firefox-140.10.0-1.el10_0.aarch64.rpm SHA-256: d67eb2fda0309d3d9da91288802e7fd642ce55ad82526a7a6035a77ebd4f717a firefox-debuginfo-140.10.0-1.el10_0.aarch64.rpm SHA-256: 21c5def8309bd5a4a2d345b709be55c9ac871115d5b6759f3cf4d4f55f4c260a firefox-debugsource-140.10.0-1.el10_0.aarch64.rpm SHA-256: e998ba48ccd52122ed0a11954c8a20315702d1c8bf7f1380abcbb49f22026cdf Red Hat Enterprise Linux for ARM 64 - 4 years of updates 10.0 SRPM firefox-140.10.0-1.el10_0.src.rpm SHA-256: cca3f8a639de6b6fa721e8c03584583eb23ac7fad56845b18be048ff52be1dc5 aarch6