Mozilla

CVE VENDORS PRODUCTS UPDATED PUBLISHED CVSS
CVE-2026-5735 1Mozilla 2Firefox Thunderbird Jun 17, 2026 Apr 7, 2026 N/A· v4 9.8 CRITICAL· v3 N/A· v2 Memory safety bugs present in 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 arbitra...Show more Memory safety bugs present in 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 was fixed in Firefox 149.0.2 and Thunderbird 149.0.2.Show less
CVE-2026-5734 1Mozilla 2Firefox Thunderbird Jun 17, 2026 Apr 7, 2026 N/A· v4 9.8 CRITICAL· v3 N/A· v2 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...Show more 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 was fixed in Firefox 149.0.2, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.Show less
CVE-2026-5733 1Mozilla 1Firefox Jun 17, 2026 Apr 7, 2026 N/A· v4 8.8 HIGH· v3 N/A· v2 Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 149.0.2 and Thunderbird 149.0.2.
CVE-2026-5732 1Mozilla 1Firefox Jun 17, 2026 Apr 7, 2026 N/A· v4 8.8 HIGH· v3 N/A· v2 Incorrect boundary conditions, integer overflow in the Graphics: Text component. This vulnerability was fixed in Firefox 149.0.2, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.
CVE-2026-5731 1Mozilla 2Firefox Thunderbird Jun 17, 2026 Apr 7, 2026 N/A· v4 9.8 CRITICAL· v3 N/A· v2 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 Thunderbird 149.0.1. Some of these bugs showed evidence of memory corruption and we presume that with...Show more 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 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 was fixed in Firefox 149.0.2, Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.Show less
CVE-2026-4371 1Mozilla 1Thunderbird Jun 17, 2026 Mar 24, 2026 N/A· v4 7.4 HIGH· v3 N/A· v2 A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker could cause...Show more A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker could cause the parser to malfunction, potentially crashing Thunderbird or leaking sensitive data. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.Show less
CVE-2026-3889 1Mozilla 1Thunderbird Jun 17, 2026 Mar 24, 2026 N/A· v4 6.5 MEDIUM· v3 N/A· v2 Spoofing issue in Thunderbird. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.
CVE-2026-4729 1Mozilla 2Firefox Thunderbird Jun 17, 2026 Mar 24, 2026 N/A· v4 9.8 CRITICAL· v3 N/A· v2 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....Show more 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 was fixed in Firefox 149 and Thunderbird 149.Show less
CVE-2026-4728 1Mozilla 2Firefox Thunderbird Jun 17, 2026 Mar 24, 2026 N/A· v4 6.5 MEDIUM· v3 N/A· v2 Spoofing issue in the Privacy: Anti-Tracking component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.
CVE-2026-4727 1Mozilla 2Firefox Thunderbird Jun 17, 2026 Mar 24, 2026 N/A· v4 7.5 HIGH· v3 N/A· v2 Denial-of-service in the Libraries component in NSS. This vulnerability was fixed in Firefox 149 and Thunderbird 149.
CVE-2026-4726 1Mozilla 2Firefox Thunderbird Jun 17, 2026 Mar 24, 2026 N/A· v4 7.5 HIGH· v3 N/A· v2 Denial-of-service in the XML component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.
CVE-2026-4725 1Mozilla 1Firefox Jun 17, 2026 Mar 24, 2026 N/A· v4 10.0 CRITICAL· v3 N/A· v2 Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.
CVE-2026-4724 1Mozilla 2Firefox Thunderbird Jun 17, 2026 Mar 24, 2026 N/A· v4 9.1 CRITICAL· v3 N/A· v2 Undefined behavior in the Audio/Video component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.
CVE-2026-4723 1Mozilla 1Firefox Jun 17, 2026 Mar 24, 2026 N/A· v4 9.8 CRITICAL· v3 N/A· v2 Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.
CVE-2026-4722 1Mozilla 1Firefox Jun 17, 2026 Mar 24, 2026 N/A· v4 8.8 HIGH· v3 N/A· v2 Privilege escalation in the IPC component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.
CVE-2026-4721 1Mozilla 2Firefox Thunderbird Jun 17, 2026 Mar 24, 2026 N/A· v4 9.8 CRITICAL· v3 N/A· v2 Memory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort...Show more Memory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, 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 was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.Show less
CVE-2026-4720 1Mozilla 2Firefox Thunderbird Jun 17, 2026 Mar 24, 2026 N/A· v4 9.8 CRITICAL· v3 N/A· v2 Memory safety bugs present in Firefox ESR 140.8, Thunderbird ESR 140.8, 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...Show more Memory safety bugs present in Firefox ESR 140.8, Thunderbird ESR 140.8, 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 was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.Show less
CVE-2026-4719 1Mozilla 1Firefox Jun 17, 2026 Mar 24, 2026 N/A· v4 7.5 HIGH· v3 N/A· v2 Incorrect boundary conditions in the Graphics: Text component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
CVE-2026-4718 1Mozilla 2Firefox Thunderbird Jun 17, 2026 Mar 24, 2026 N/A· v4 8.1 HIGH· v3 N/A· v2 Undefined behavior in the WebRTC: Signaling component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
CVE-2026-4717 1Mozilla 1Firefox Jun 17, 2026 Mar 24, 2026 N/A· v4 9.8 CRITICAL· v3 N/A· v2 Privilege escalation in the Netmonitor component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

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