Mozilla Firefox vulnerabilities

CVE-2015-2716 [HIGH] CVE-2015-2716: Buffer overflow in the XML parser in Mozilla Firefox before 38.0, Firefox ESR 31.x before 31.7, and Buffer overflow in the XML parser in Mozilla Firefox before 38.0, Firefox ESR 31.x before 31.7, and Thunderbird before 31.7 allows remote attackers to execute arbitrary code by providing a large amount of compressed XML data, a related issue to CVE-2015-1283.

CVE-2020-12390 [CRITICAL] CWE-502 CVE-2020-12390: Incorrect origin serialization of URLs with IPv6 addresses could lead to incorrect security checks. Incorrect origin serialization of URLs with IPv6 addresses could lead to incorrect security checks. This vulnerability affects Firefox < 76.

CVE-2007-2671 [HIGH] CVE-2007-2671: Mozilla Firefox 2.0.0.3 allows remote attackers to cause a denial of service (application crash) via Mozilla Firefox 2.0.0.3 allows remote attackers to cause a denial of service (application crash) via a long hostname in an HREF attribute in an A element, which triggers an out-of-bounds memory access.

CVE-2005-4720 [MEDIUM] CVE-2005-4720: Mozilla Firefox 1.0.7 and earlier on Linux allows remote attackers to cause a denial of service (cli Mozilla Firefox 1.0.7 and earlier on Linux allows remote attackers to cause a denial of service (client crash) via an IFRAME element with a large value of the WIDTH attribute, which triggers a problem related to representation of floating-point numbers, leading to an infinite loop of widget resizes and a corresponding large number of function calls on the sta

CVE-2012-3961 [CRITICAL] CWE-416 CVE-2012-3961: Use-after-free vulnerability in the RangeData implementation in Mozilla Firefox before 15.0, Firefox Use-after-free vulnerability in the RangeData implementation in Mozilla Firefox before 15.0, Firefox ESR 10.x before 10.0.7, Thunderbird before 15.0, Thunderbird ESR 10.x before 10.0.7, and SeaMonkey before 2.12 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via unspecified vectors.

CVE-2023-5173 [HIGH] CWE-190 CVE-2023-5173: In a non-standard configuration of Firefox, an integer overflow could have occurred based on network In a non-standard configuration of Firefox, an integer overflow could have occurred based on network traffic (possibly under influence of a local unprivileged webpage), leading to an out-of-bounds write to privileged process memory. *This bug only affects Firefox if a non-standard preference allowing non-HTTPS Alternate Services (`network.http.altsvc.oe

CVE-2009-2468 [CRITICAL] CVE-2009-2468: Integer overflow in Apple CoreGraphics, as used in Safari before 4.0.3, Mozilla Firefox before 3.0.1 Integer overflow in Apple CoreGraphics, as used in Safari before 4.0.3, Mozilla Firefox before 3.0.12, and Mac OS X 10.4.11 and 10.5.8, allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a long text run that triggers a heap-based buffer overflow during font glyph rendering, a related issue to CVE-

CVE-2018-5178 [HIGH] CWE-119 CVE-2018-5178: A buffer overflow was found during UTF8 to Unicode string conversion within JavaScript with extremel A buffer overflow was found during UTF8 to Unicode string conversion within JavaScript with extremely large amounts of data. This vulnerability requires the use of a malicious or vulnerable legacy extension in order to occur. This vulnerability affects Thunderbird ESR < 52.8, Thunderbird < 52.8, and Firefox ESR < 52.8.

CVE-2013-5597 [CRITICAL] CVE-2013-5597: Use-after-free vulnerability in the nsDocLoader::doStopDocumentLoad function in Mozilla Firefox befo Use-after-free vulnerability in the nsDocLoader::doStopDocumentLoad function in Mozilla Firefox before 25.0, Firefox ESR 17.x before 17.0.10 and 24.x before 24.1, Thunderbird before 24.1, Thunderbird ESR 17.x before 17.0.10, and SeaMonkey before 2.22 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via

CVE-2026-6786 [HIGH] CWE-125 CVE-2026-6786: Memory safety bugs present in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird Memory safety bugs present in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149. 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 Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunder

CVE-2011-3655 [CRITICAL] CWE-94 CVE-2011-3655: Mozilla Firefox 4.x through 7.0 and Thunderbird 5.0 through 7.0 perform access control without check Mozilla Firefox 4.x through 7.0 and Thunderbird 5.0 through 7.0 perform access control without checking for use of the NoWaiverWrapper wrapper, which allows remote attackers to gain privileges via a crafted web site.

CVE-2018-12363 [HIGH] CWE-416 CVE-2018-12363: A use-after-free vulnerability can occur when script uses mutation events to move DOM nodes between A use-after-free vulnerability can occur when script uses mutation events to move DOM nodes between documents, resulting in the old document that held the node being freed but the node still having a pointer referencing it. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60, Thunderbird < 52.9, Firefox ESR < 60

CVE-2019-11745 [HIGH] CWE-787 CVE-2019-11745: When encrypting with a block cipher, if a call to NSC_EncryptUpdate was made with data smaller than When encrypting with a block cipher, if a call to NSC_EncryptUpdate was made with data smaller than the block size, a small out of bounds write could occur. This could have caused heap corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 68.3, Firefox ESR < 68.3, and Firefox < 71.

CVE-2009-1834 [MEDIUM] CWE-20 CVE-2009-1834: Visual truncation vulnerability in netwerk/dns/src/nsIDNService.cpp in Mozilla Firefox before 3.0.11 Visual truncation vulnerability in netwerk/dns/src/nsIDNService.cpp in Mozilla Firefox before 3.0.11 and SeaMonkey before 1.1.17 allows remote attackers to spoof the location bar via an IDN with invalid Unicode characters that are displayed as whitespace, as demonstrated by the \u115A through \u115E characters.

CVE-2025-1942 [CRITICAL] CWE-908 CVE-2025-1942: When String.toUpperCase() caused a string to get longer it was possible for uninitialized memory to 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.

CVE-2016-1961 [HIGH] CVE-2016-1961: Use-after-free vulnerability in the nsHTMLDocument::SetBody function in dom/html/nsHTMLDocument.cpp Use-after-free vulnerability in the nsHTMLDocument::SetBody function in dom/html/nsHTMLDocument.cpp in Mozilla Firefox before 45.0 and Firefox ESR 38.x before 38.7 allows remote attackers to execute arbitrary code by leveraging mishandling of a root element, aka ZDI-CAN-3574.

CVE-2026-7323 [HIGH] CWE-119 CVE-2026-7323: Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. Some of these bugs s Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. 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 Firefox 150.0.1, Firefox ESR 140.10.1, Thunderbird 150.0.1, and Thunderbird 140.10.1.

CVE-2026-7322 [HIGH] CWE-119 CVE-2026-7322: Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. Some of these bugs s Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. 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 Firefox 150.0.1, Firefox ESR 140.10.1, Firefox ESR 115.35.1, Thunderbird 150.0.1, and

CVE-2026-7324 [HIGH] CWE-119 CVE-2026-7324: Memory safety bugs present in Thunderbird 150.0.0. Some of these bugs showed evidence of memory corr Memory safety bugs present in Thunderbird 150.0.0. 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 Firefox 150.0.1 and Thunderbird 150.0.1.

CVE-2018-5129 [HIGH] CWE-787 CVE-2018-5129: A lack of parameter validation on IPC messages results in a potential out-of-bounds write through ma A lack of parameter validation on IPC messages results in a potential out-of-bounds write through malformed IPC messages. This can potentially allow for sandbox escape through memory corruption in the parent process. This vulnerability affects Thunderbird < 52.7, Firefox ESR < 52.7, and Firefox < 59.