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Critical 9.8
Memory safety bugs fixed in Firefox 141 and Thunderbird 141
Memory safety bugs present in Firefox 140 and Thunderbird 140. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefo…
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Critical 9.8
Incorrect URL truncation
Focus incorrectly truncated URLs towards the beginning instead of around the origin. This vulnerability was fixed in Firefox 141.
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Critical 9.8
Incorrect URL stripping in CSP reports
The `username:password` part was not correctly stripped from URLs in CSP reports potentially leaking HTTP Basic Authentication credentials. This vulnerability was fixed in Firefox 141, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13…
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Critical 9.8
CSP frame-src was not correctly enforced for paths
Thunderbird ignored paths when checking the validity of navigations in a frame. This vulnerability was fixed in Firefox 141, Firefox ESR 140.1, Thunderbird 141, and Thunderbird 140.1.
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Critical 9.1
Nameless cookies shadow secure cookies
Setting a nameless cookie with an equals sign in the value shadowed other cookies. Even if the nameless cookie was set over HTTP and the shadowed cookie included the `Secure` attribute. This vulnerability was fixed in Firefox 141, Firefox ESR 140.1, Thunderbi…
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Critical 9.8
Large branch table could lead to truncated instruction
On arm64, a WASM `br_table` instruction with a lot of entries could lead to the label being too far from the instruction causing truncation and incorrect computation of the branch address. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firef…
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Critical 9.8
WebAuthn would allow a user to sign a challenge on a webpage with an invalid TLS certificate
If a user visited a webpage with an invalid TLS certificate, and granted an exception, the webpage was able to provide a WebAuthn challenge that the user would be prompted to complete. This is in violation of the WebAuthN spec which requires "a secure transpo…
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Critical 9.1
connect-src Content Security Policy restriction could be bypassed
An attacker was able to bypass the `connect-src` directive of a Content Security Policy by manipulating subdocuments. This would have also hidden the connections from the Network tab in Devtools. This vulnerability was fixed in Firefox 140 and Thunderbird 140.
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Critical 9.8
Use-after-free in FontFaceSet
A use-after-free in FontFaceSet resulted in a potentially exploitable crash. This vulnerability was fixed in Firefox 140, Firefox ESR 115.25, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.
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Critical 9.8
Integer overflow in OrderedHashTable
An integer overflow was present in `OrderedHashTable` used by the JavaScript engine. This vulnerability was fixed in Firefox 139.0.4.
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Critical 9.8
Memory corruption in canvas surfaces
Certain canvas operations could have lead to memory corruption. This vulnerability was fixed in Firefox 139.0.4.
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Critical 9.8
Out-of-bounds access when resolving Promise objects
An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object. This vulnerability was fixed in Firefox 138.0.4, Firefox ESR 128.10.1, Firefox ESR 115.23.1, Thunderbird 128.10.2, and Thunderbird 138.0.2.
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Critical 9.1
Process isolation bypass using "javascript:" URI links in cross-origin frames
A process isolation vulnerability in Thunderbird stemmed from improper handling of javascript: URIs, which could allow content to execute in the top-level document's process instead of the intended frame, potentially enabling a sandbox escape. This vulnerabil…
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Critical 10.0
Incorrect handle could lead to sandbox escapes
Following the recent Chrome sandbox escape (CVE-2025-2783), various Firefox developers identified a similar pattern in our IPC code. A compromised child process could cause the parent process to return an unintentionally powerful handle, leading to a sandbox …
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Critical 9.1
Lock screen setting bypass in Firefox Focus for Android
Under certain circumstances, a user opt-in setting that Focus should require authentication before use could have been be bypassed (distinct from CVE-2025-0245). This vulnerability was fixed in Firefox 136.
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Critical 9.8
Disclosure of uninitialized memory when .toUpperCase() causes string to get longer
When String.toUpperCase() caused a string to get longer it was possible for uninitialized memory to be incorporated into the result string. This vulnerability was fixed in Firefox 136 and Thunderbird 136.
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Critical 9.8
Memory safety bugs fixed in Firefox 135, Thunderbird 135, Firefox ESR 128.7, and Thunderbird 128.7
Memory safety bugs present in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and Thunderbird 128.6. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.…
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Critical 9.8
Memory safety bugs fixed in Firefox 135 and Thunderbird 135
Memory safety bugs present in Firefox 134 and Thunderbird 134. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefo…
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Critical 9.8
Memory safety bugs fixed in Firefox 135, Thunderbird 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 115.20, and Thunderbird 128.7
Memory safety bugs present in Firefox 134, Thunderbird 134, Firefox ESR 115.19, Firefox ESR 128.6, Thunderbird 115.19, and Thunderbird 128.6. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could ha…
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Critical 9.8
Use-after-free during concurrent delazification
A race during concurrent delazification could have led to a use-after-free. This vulnerability was fixed in Firefox 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.
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Critical 9.8
A bug in WebAssembly code generation could result in a crash
A bug in WebAssembly code generation could have lead to a crash. It may have been possible for an attacker to leverage this to achieve code execution. This vulnerability was fixed in Firefox 135, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.
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Critical 9.8
Use-after-free in Custom Highlight
An attacker could have caused a use-after-free via the Custom Highlight API, leading to a potentially exploitable crash. This vulnerability was fixed in Firefox 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.
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Critical 9.8
Use-after-free in XSLT
An attacker could have caused a use-after-free via crafted XSLT data, leading to a potentially exploitable crash. This vulnerability was fixed in Firefox 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.
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Critical 9.8CVE-2025-0247 EPSS 11%
Memory safety bugs fixed in Firefox 134 and Thunderbird 134
Memory safety bugs present in Firefox 133 and Thunderbird 133. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefo…
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Critical 9.1
`NSC_DeriveKey` inadvertently assumed that the `phKey` parameter is always non-NULL. When it was passed as NULL, a segm…
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Critical 9.8
A flaw in handling fullscreen transitions may have inadvertently caused the application to become stuck in fullscreen m…
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Critical 9.8
A double-free issue could have occurred in `sec_pkcs7_decoder_start_decrypt()` when handling an error path. Under speci…
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Critical 9.8
The executable file warning was not presented when downloading .library-ms files. *Note: This issue only affected Windo…
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Critical 9.8
Potential race conditions in IndexedDB could have caused memory corruption, leading to a potentially exploitable crash.…
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Critical 9.8
Memory safety bugs present in Firefox 131, Firefox ESR 128.3, and Thunderbird 128.3. Some of these bugs showed evidence…
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Critical 9.8
An attacker was able to achieve code execution in the content process by exploiting a use-after-free in Animation timel…
KEV Oct 15, 2024 -
Critical 9.8
Memory safety bugs present in Firefox 130, Firefox ESR 115.15, Firefox ESR 128.2, and Thunderbird 128.2. Some of these …
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Critical 9.8
Memory safety bugs present in Firefox 130, Firefox ESR 128.2, and Thunderbird 128.2. Some of these bugs showed evidence…
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Critical 9.8
A compromised content process could have allowed for the arbitrary loading of cross-origin pages. This vulnerability af…
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Critical 9.8
Memory safety bugs present in Firefox 129. Some of these bugs showed evidence of memory corruption and we presume that …
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Critical 9.8
Memory safety bugs present in Firefox 129, Firefox ESR 128.1, and Thunderbird 128.1. Some of these bugs showed evidence…
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Critical 9.8
A difference in the handling of StructFields and ArrayTypes in WASM could be used to trigger an exploitable type confus…
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Critical 9.8
The JavaScript garbage collector could mis-color cross-compartment objects if OOM conditions were detected at the right…
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Critical 9.8CVE-2024-8381 Public exploit
A potentially exploitable type confusion could be triggered when looking up a property name on an object being used as …
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Critical 9.8
Incorrect garbage collection interaction could have led to a use-after-free. This vulnerability affects Firefox < 129.