Mozilla Thunderbird (ar) 151.0
Mozilla Thunderbird (ar) 151.0, released May 19, 2026, fixes 25 CVEs in Mozilla Thunderbird (ar). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Mozilla Thunderbird (ar) is 159.0, which also fixes every one of these CVEs.
Superseded. The latest Mozilla Thunderbird (ar) is 159.0, which also fixes every CVE on this page. Install that instead.
Priority of the 25 CVEs
Applies to
| Product | Version |
|---|---|
| Mozilla Thunderbird (ar) | 151.0 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| Urgent | CVE-2026-8948 | Same-origin policy bypass in the DOM: Networking component | 9.1 | 0.0042 | None reported |
| High | CVE-2026-8956 | Integer overflow in the Networking: JAR component | 9.8 | 0.0061 | None reported |
| High | CVE-2026-8949 | Integer overflow in the Widget: Win32 component | 7.5 | 0.0058 | None reported |
| High | CVE-2026-8975 | Memory safety bugs fixed in Thunderbird 140.11 and Thunderbird 151 | 8.8 | 0.0047 | None reported |
| High | CVE-2026-8959 | Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component | 9.6 | 0.0042 | None reported |
| High | CVE-2026-8968 | Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component | 7.5 | 0.0041 | None reported |
| High | CVE-2026-8955 | Privilege escalation in the DOM: Workers component | 8.8 | 0.0039 | None reported |
| High | CVE-2026-8957 | Privilege escalation in the Enterprise Policies component | 8.8 | 0.0039 | None reported |
| High | CVE-2026-8960 | Spoofing issue in WebExtensions | 7.5 | 0.0038 | None reported |
| High | CVE-2026-8952 | Privilege escalation in the Application Update component | 8.8 | 0.0037 | None reported |
| High | CVE-2026-8962 | Mitigation bypass in the DOM: Security component | 8.1 | 0.0037 | None reported |
| High | CVE-2026-8973 | Memory safety bugs fixed in Thunderbird 151 | 8.8 | 0.0037 | None reported |
| High | CVE-2026-8974 | Memory safety bugs fixed in Thunderbird 140.11 and Thunderbird 151 | 8.8 | 0.0037 | None reported |
| High | CVE-2026-8958 | Information disclosure, sandbox escape in the Security: Process Sandboxing component | 8.6 | 0.0034 | None reported |
| High | CVE-2026-8966 | Information disclosure in the IP Protection component | 7.5 | 0.0033 | None reported |
| High | CVE-2026-8967 | Information disclosure in the Graphics: WebGPU component | 7.5 | 0.0033 | None reported |
| High | CVE-2026-8972 | Privilege escalation in the WebRTC: Audio/Video component | 8.8 | 0.0033 | None reported |
| High | CVE-2026-8965 | Information disclosure in the DOM: Security component | 7.5 | 0.0032 | None reported |
| High | CVE-2026-8961 | Spoofing issue in the Form Autofill component | 7.5 | 0.0032 | None reported |
| High | CVE-2026-8970 | Privilege escalation in the Security component | 8.8 | 0.0031 | None reported |
| High | CVE-2026-8963 | Spoofing issue in the Web Speech component | 7.5 | 0.0030 | None reported |
| High | CVE-2026-8964 | Spoofing issue in the Popup Blocker component | 7.5 | 0.0030 | None reported |
| High | CVE-2026-8969 | Mitigation bypass in the DOM: Security component | 8.1 | 0.0029 | None reported |
| High | CVE-2026-8950 | Same-origin policy bypass in the Networking: HTTP component | 9.3 | 0.0019 | None reported |
| Routine | CVE-2026-8971 | Same-origin policy bypass in the Networking: JAR component | 6.5 | 0.0021 | None reported |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.