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Vulnerabilities of Mozilla Firefox ESR

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CVE Summary Score Published
CVE-2026-5731 Memory safety bugs present in Firefox ESR 115.34.0, Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and… 9.8 Critical Apr 7, 2026
CVE-2026-0884 Use-after-free in the JavaScript Engine component 9.8 Critical Jan 13, 2026
CVE-2026-0879 Sandbox escape due to incorrect boundary conditions in the Graphics component 9.8 Critical Jan 13, 2026
CVE-2025-14330 JIT miscompilation in the JavaScript Engine: JIT component 9.8 Critical Dec 9, 2025
CVE-2025-14324 JIT miscompilation in the JavaScript Engine: JIT component 9.8 Critical Dec 9, 2025
CVE-2025-14321 Use-after-free in the WebRTC: Signaling component 9.8 Critical Dec 9, 2025
CVE-2025-11708 Use-after-free in MediaTrackGraphImpl::GetInstance() 9.8 Critical Oct 14, 2025
CVE-2025-11710 A compromised web process using malicious IPC messages could have caused the privileged browser process to reveal blocks… 9.8 Critical Oct 14, 2025
CVE-2025-11709 A compromised web process was able to trigger out of bounds reads and writes in a more privileged process using… 9.8 Critical Oct 14, 2025
CVE-2025-9179 An attacker was able to perform memory corruption in the GMP process which processes encrypted media 9.8 Critical Aug 19, 2025
CVE-2025-8031 The `username:password` part was not correctly stripped from URLs in CSP reports potentially leaking HTTP Basic… 9.8 Critical Jul 22, 2025
CVE-2025-8038 Thunderbird ignored paths when checking the validity of navigations in a frame 9.8 Critical Jul 22, 2025
CVE-2025-8037 Setting a nameless cookie with an equals sign in the value shadowed other cookies 9.1 Critical Jul 22, 2025
CVE-2025-8028 On arm64, a WASM `br_table` instruction with a lot of entries could lead to the label being too far from the instruction… 9.8 Critical Jul 22, 2025
CVE-2025-6424 A use-after-free in FontFaceSet resulted in a potentially exploitable crash 9.8 Critical Jun 24, 2025
CVE-2025-4918 An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object 9.8 Critical May 17, 2025
CVE-2025-4083 A process isolation vulnerability in Thunderbird stemmed from improper handling of javascript: URIs, which could allow… 9.1 Critical Apr 29, 2025
CVE-2025-2857 Following the recent Chrome sandbox escape (CVE-2025-2783), various Firefox developers identified a similar pattern in… 10.0 Critical Mar 27, 2025
CVE-2025-1017 Memory safety bugs present in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and Thunderbird 128.6 9.8 Critical Feb 4, 2025
CVE-2025-1016 Memory safety bugs present in Firefox 134, Thunderbird 134, Firefox ESR 115.19, Firefox ESR 128.6, Thunderbird 115.19,… 9.8 Critical Feb 4, 2025
CVE-2025-1012 A race during concurrent delazification could have led to a use-after-free 9.8 Critical Feb 4, 2025
CVE-2025-1011 A bug in WebAssembly code generation could have lead to a crash 9.8 Critical Feb 4, 2025
CVE-2025-1010 An attacker could have caused a use-after-free via the Custom Highlight API, leading to a potentially exploitable crash 9.8 Critical Feb 4, 2025
CVE-2025-1009 An attacker could have caused a use-after-free via crafted XSLT data, leading to a potentially exploitable crash 9.8 Critical Feb 4, 2025
CVE-2024-11698 A flaw in handling fullscreen transitions may have inadvertently caused the application to become stuck in fullscreen… 9.8 Critical Nov 26, 2024

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