{"schema_version":"1.7.2","id":"OESA-2026-3558","modified":"2026-08-30T04:17:20Z","published":"2026-08-30T04:17:20Z","upstream":["CVE-2026-74934","CVE-2026-74935","CVE-2026-74936","CVE-2026-74939","CVE-2026-74940","CVE-2026-74941","CVE-2026-74942","CVE-2026-74943","CVE-2026-74944","CVE-2026-74945","CVE-2026-74946","CVE-2026-74948","CVE-2026-74949","CVE-2026-74953","CVE-2026-74957","CVE-2026-74959","CVE-2026-74960","CVE-2026-74962","CVE-2026-74963","CVE-2026-74964","CVE-2026-74965","CVE-2026-74967","CVE-2026-74969","CVE-2026-74971","CVE-2026-74972","CVE-2026-74973","CVE-2026-74974","CVE-2026-74976","CVE-2026-74983","CVE-2026-74987","CVE-2026-74990"],"summary":"firefox security update","details":"Mozilla Firefox is an open-source web browser, designed for standards compliance, performance and portability. %if 0 %global moz_debug_prefix /lib/debug %global moz_debug_dir /lib/debug/ %global uname_m %(uname -m) %global symbols_file_name -.en-US.-%(uname.crashreporter-symbols.zip %global symbols_file_path /lib/debug//-.en-US.-%(uname.crashreporter-symbols.zip %global _find_debuginfo_opts -p /lib/debug//-.en-US.-%(uname.crashreporter-symbols.zip -o debugcrashreporter.list %global crashreporter_pkg_name mozilla-crashreporter--debuginfo\r\n\r\nSecurity Fix(es):\n\nSite isolation issue in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74934)\n\nA privilege escalation vulnerability exists in Mozilla Firefox and Thunderbird in the DOM: Networking component. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. An attacker could exploit this vulnerability to affect confidentiality, integrity, and availability. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74935)\n\nUse-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74936)\n\nPrivilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74939)\n\nUse-after-free in the Graphics: Text component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74940)\n\nPrivilege escalation in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This has an impact on confidentiality, integrity, and availability.(CVE-2026-74941)\n\nPrivilege escalation in the Remote Settings Client component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74942)\n\nUse-after-free in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74943)\n\nUse-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74944)\n\nInformation disclosure in the Graphics: Text component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74945)\n\nPrivilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74946)\n\nInformation disclosure in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74948)\n\nPrivilege escalation due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74949)\n\nPrivilege escalation in the Networking: Cookies component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74953)\n\nMitigation bypass in the Safe Browsing component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74957)\n\nMitigation bypass in the Storage: Cache API component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74959)\n\nSite isolation issue in the WebExtensions component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74960)\n\nSite isolation issue in the Networking: Cookies component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74962)\n\nSame-origin policy bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74963)\n\nInteger overflow in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74964)\n\nPrivilege escalation in the Shell Integration component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74965)\n\nSame-origin policy bypass in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74967)\n\nUse-after-free in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74969)\n\nInformation disclosure in the DOM: UI Events & Focus Handling component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74971)\n\nInformation disclosure in the DOM: Push Subscriptions component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74972)\n\nRace condition, use-after-free in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74973)\n\nSame-origin policy bypass in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74974)\n\nJIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74976)\n\nMitigation bypass in the Data Loss Prevention component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74983)\n\nInternally found bugs present in Firefox ESR 140.13, Firefox ESR 153.0 and Firefox 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74987)\n\nInternally found bugs present in Thunderbird ESR 140.13, Thunderbird ESR 153.0 and Thunderbird 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.(CVE-2026-74990)","affected":[{"package":{"ecosystem":"openEuler:24.03-LTS-SP3","name":"firefox","purl":"pkg:rpm/openEuler/firefox&distro=openEuler-24.03-LTS-SP3"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"140.14.0-1.oe2403sp3"}]}],"ecosystem_specific":{"aarch64":["firefox-140.14.0-1.oe2403sp3.aarch64.rpm","firefox-debuginfo-140.14.0-1.oe2403sp3.aarch64.rpm","firefox-debugsource-140.14.0-1.oe2403sp3.aarch64.rpm"],"src":["firefox-140.14.0-1.oe2403sp3.src.rpm"],"x86_64":["firefox-140.14.0-1.oe2403sp3.x86_64.rpm","firefox-debuginfo-140.14.0-1.oe2403sp3.x86_64.rpm","firefox-debugsource-140.14.0-1.oe2403sp3.x86_64.rpm"]}}],"references":[{"type":"ADVISORY","url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3558"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74934"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74935"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74936"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74939"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74940"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74941"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74942"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74943"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74944"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74945"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74946"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74948"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74949"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74953"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74957"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74959"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74960"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74962"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74963"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74964"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74965"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74967"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74969"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74971"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74972"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74973"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74974"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74976"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74983"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74987"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74990"}],"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}],"database_specific":{"severity":"Critical"}}