Debian Firefox vulnerabilities

CVE-2026-5734 [CRITICAL] CVE-2026-5734: firefox - Memory safety bugs present in Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Fire... Memory safety bugs present in Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and Thunderbird 149.0.1. 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 affects Firefox < 149.0.2, Firefox ESR < 140.9.1, Thunderbird < 149.0.2,

CVE-2025-6436 [HIGH] CVE-2025-6436: firefox - Memory safety bugs present in Firefox 139 and Thunderbird 139. Some of these bug... Memory safety bugs present in Firefox 139 and Thunderbird 139. 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 affects Firefox < 140 and Thunderbird < 140. Scope: local sid: resolved (fixed in 140.0-1)

CVE-2017-5461 [CRITICAL] CVE-2017-5461: firefox - Mozilla Network Security Services (NSS) before 3.21.4, 3.22.x through 3.28.x bef... Mozilla Network Security Services (NSS) before 3.21.4, 3.22.x through 3.28.x before 3.28.4, 3.29.x before 3.29.5, and 3.30.x before 3.30.1 allows remote attackers to cause a denial of service (out-of-bounds write) or possibly have unspecified other impact by leveraging incorrect base64 operations. Scope: local sid: resolved (fixed in 52.0.1-1)

CVE-2025-6427 [CRITICAL] CVE-2025-6427: firefox - An attacker was able to bypass the `connect-src` directive of a Content Security... 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 affects Firefox < 140 and Thunderbird < 140. Scope: local sid: resolved (fixed in 140.0-1)

CVE-2024-11697 [HIGH] CVE-2024-11697: firefox - When handling keypress events, an attacker may have been able to trick a user in... When handling keypress events, an attacker may have been able to trick a user into bypassing the "Open Executable File?" confirmation dialog. This could have led to malicious code execution. This vulnerability affects Firefox < 133, Firefox ESR < 128.5, Thunderbird < 133, and Thunderbird < 128.5. Scope: local sid: resolved (fixed in 133.0-1)

CVE-2018-5146 [HIGH] CVE-2018-5146: firefox - An out of bounds memory write while processing Vorbis audio data was reported th... An out of bounds memory write while processing Vorbis audio data was reported through the Pwn2Own contest. This vulnerability affects Firefox < 59.0.1, Firefox ESR < 52.7.2, and Thunderbird < 52.7. Scope: local sid: resolved (fixed in 59.0.1-1)

CVE-2018-12387 [CRITICAL] CVE-2018-12387: firefox - A vulnerability where the JavaScript JIT compiler inlines Array.prototype.push w... A vulnerability where the JavaScript JIT compiler inlines Array.prototype.push with multiple arguments that results in the stack pointer being off by 8 bytes after a bailout. This leaks a memory address to the calling function which can be used as part of an exploit inside the sandboxed content process. This vulnerability affects Firefox ESR < 60.2.2 and Firefox

CVE-2017-5391 [CRITICAL] CVE-2017-5391: firefox - Special "about:" pages used by web content, such as RSS feeds, can load privileg... Special "about:" pages used by web content, such as RSS feeds, can load privileged "about:" pages in an iframe. If a content-injection bug were found in one of those pages this could allow for potential privilege escalation. This vulnerability affects Firefox < 51. Scope: local sid: resolved (fixed in 51.0-1)

CVE-2016-1950 [HIGH] CVE-2016-1950: firefox - Heap-based buffer overflow in Mozilla Network Security Services (NSS) before 3.1... Heap-based buffer overflow in Mozilla Network Security Services (NSS) before 3.19.2.3 and 3.20.x and 3.21.x before 3.21.1, as used in Mozilla Firefox before 45.0 and Firefox ESR 38.x before 38.7, allows remote attackers to execute arbitrary code via crafted ASN.1 data in an X.509 certificate. Scope: local sid: resolved (fixed in 45.0-1)

CVE-2025-1009 [CRITICAL] CVE-2025-1009: firefox - An attacker could have caused a use-after-free via crafted XSLT data, leading to... An attacker could have caused a use-after-free via crafted XSLT data, leading to a potentially exploitable crash. This vulnerability affects Firefox < 135, Firefox ESR < 115.20, Firefox ESR < 128.7, Thunderbird < 128.7, and Thunderbird < 135. Scope: local sid: resolved (fixed in 135.0-1)

CVE-2026-2774 [CRITICAL] CVE-2026-2774: firefox - Integer overflow in the Audio/Video component. This vulnerability affects Firefo... Integer overflow in the Audio/Video component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8. Scope: local sid: resolved (fixed in 148.0-1)

CVE-2018-18500 [CRITICAL] CVE-2018-18500: firefox - A use-after-free vulnerability can occur while parsing an HTML5 stream in concer... A use-after-free vulnerability can occur while parsing an HTML5 stream in concert with custom HTML elements. This results in the stream parser object being freed while still in use, leading to a potentially exploitable crash. This vulnerability affects Thunderbird < 60.5, Firefox ESR < 60.5, and Firefox < 65. Scope: local sid: resolved (fixed in 65.0-1)

CVE-2026-2762 [CRITICAL] CVE-2026-2762: firefox - Integer overflow in the JavaScript: Standard Library component. This vulnerabili... Integer overflow in the JavaScript: Standard Library component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8. Scope: local sid: resolved (fixed in 148.0-1)

CVE-2025-14324 [CRITICAL] CVE-2025-14324: firefox - JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability a... JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability affects Firefox < 146, Firefox ESR < 115.31, Firefox ESR < 140.6, Thunderbird < 146, and Thunderbird < 140.6. Scope: local sid: resolved (fixed in 146.0-1)

CVE-2025-14330 [CRITICAL] CVE-2025-14330: firefox - JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability a... JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability affects Firefox < 146, Firefox ESR < 140.6, Thunderbird < 146, and Thunderbird < 140.6. Scope: local sid: resolved (fixed in 146.0-1)

CVE-2026-0892 [CRITICAL] CVE-2026-0892: firefox - Memory safety bugs present in Firefox 146 and Thunderbird 146. Some of these bug... Memory safety bugs present in Firefox 146 and Thunderbird 146. 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 affects Firefox < 147 and Thunderbird < 147. Scope: local sid: resolved (fixed in 147.0-1)

CVE-2026-2777 [CRITICAL] CVE-2026-2777: firefox - Privilege escalation in the Messaging System component. This vulnerability affec... Privilege escalation in the Messaging System component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8. Scope: local sid: resolved (fixed in 148.0-1)

CVE-2024-1554 [CRITICAL] CVE-2024-1554: firefox - The `fetch()` API and navigation incorrectly shared the same cache, as the cache... The `fetch()` API and navigation incorrectly shared the same cache, as the cache key did not include the optional headers `fetch()` may contain. Under the correct circumstances, an attacker may have been able to poison the local browser cache by priming it with a `fetch()` response controlled by the additional headers. Upon navigation to the same URL, the user wou

CVE-2026-4729 [CRITICAL] CVE-2026-4729: firefox - Memory safety bugs present in Firefox 148 and Thunderbird 148. Some of these bug... Memory safety bugs present in Firefox 148 and Thunderbird 148. 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 affects Firefox < 149 and Thunderbird < 149. Scope: local sid: resolved (fixed in 149.0-1)

CVE-2026-2807 [CRITICAL] CVE-2026-2807: firefox - Memory safety bugs present in Firefox 147 and Thunderbird 147. Some of these bug... Memory safety bugs present in Firefox 147 and Thunderbird 147. 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 affects Firefox < 148 and Thunderbird < 148. Scope: local sid: resolved (fixed in 148.0-1)