{"id":"RLSA-2026:21381","summary":"Important: thunderbird security update","details":"Mozilla Thunderbird is a standalone mail and newsgroup client.\n\nSecurity Fix(es):\n\n* firefox: Incorrect boundary conditions in the JavaScript Engine: JIT component (CVE-2026-8388)\n\n* firefox: Other issue in the JavaScript Engine component (CVE-2026-8391)\n\n* firefox: Sandbox escape in the Profile Backup component (CVE-2026-8401)\n\n* firefox: Integer overflow in the Networking: JAR component (CVE-2026-8956)\n\n* firefox: Memory safety bugs fixed in Firefox ESR 115.36, Firefox ESR 140.11 and Firefox 151 (CVE-2026-8975)\n\n* firefox: Privilege escalation in the DOM: Workers component (CVE-2026-8955)\n\n* firefox: Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component (CVE-2026-8968)\n\n* firefox: Incorrect boundary conditions, integer overflow in the Audio/Video component (CVE-2026-8954)\n\n* firefox: Information disclosure, sandbox escape in the Security: Process Sandboxing component (CVE-2026-8958)\n\n* firefox: Incorrect boundary conditions in the Audio/Video: Web Codecs component (CVE-2026-8946)\n\n* firefox: Privilege escalation in the Security component (CVE-2026-8970)\n\n* firefox: Same-origin policy bypass in the Networking: HTTP component (CVE-2026-8950)\n\n* firefox: Memory safety bugs fixed in Firefox ESR 140.11 and Firefox 151 (CVE-2026-8974)\n\n* firefox: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-8953)\n\n* firefox: Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component (CVE-2026-8959)\n\n* firefox: Spoofing issue in the Form Autofill component (CVE-2026-8961)\n\n* firefox: Use-after-free in the DOM: Bindings (WebIDL) component (CVE-2026-8947)\n\n* firefox: Mitigation bypass in the DOM: Security component (CVE-2026-8962)\n\n* firefox: Privilege escalation in the Enterprise Policies component (CVE-2026-8957)\n\nFor 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.","modified":"2026-05-30T18:25:44.497179353Z","published":"2026-05-30T18:03:01.190443Z","upstream":["CVE-2026-8388","CVE-2026-8391","CVE-2026-8401","CVE-2026-8946","CVE-2026-8947","CVE-2026-8950","CVE-2026-8953","CVE-2026-8954","CVE-2026-8955","CVE-2026-8956","CVE-2026-8957","CVE-2026-8958","CVE-2026-8959","CVE-2026-8961","CVE-2026-8962","CVE-2026-8968","CVE-2026-8970","CVE-2026-8974","CVE-2026-8975"],"references":[{"type":"ADVISORY","url":"https://errata.rockylinux.org/RLSA-2026:21381"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2476469"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2476475"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2476492"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479839"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479840"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479842"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479846"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479847"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479848"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479849"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479852"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479853"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479855"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479860"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479861"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479871"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479873"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479876"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479880"}],"affected":[{"package":{"name":"thunderbird","ecosystem":"Rocky Linux:9","purl":"pkg:rpm/rocky-linux/thunderbird?distro=rocky-linux-9&epoch=0"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:140.11.0-1.el9_8"}],"database_specific":{"yum_repository":"AppStream"}}],"database_specific":{"source":"https://storage.googleapis.com/resf-osv-data/RLSA-2026:21381.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"}],"credits":[{"name":"Rocky Enterprise Software Foundation"},{"name":"Red Hat"}]}