Mozilla
Thunderbird
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153.0
- Release date
- July 21, 2026
- Security status
- 25 high-severity CVEs tracked in the last 90 days. Current version not affected.
Source
Public release notes are linked for the latest stored release.
Release history
See the latest published releases stored for this product.
| Version | Published | Notes |
|---|---|---|
| 153.0 | 2026-07-21 | Release Notes |
| 152.0.1 | 2026-07-01 | Release Notes |
| 152.0 | 2026-06-16 | Release Notes |
| 151.0.1 | 2026-05-26 | Release Notes |
| 151.0 | 2026-05-19 | Release Notes |
Vulnerability tracking
versionPing monitors CVEs for this product. Matching CVEs are listed below. We only display CVEs with a CVSS score of 7.0 or higher that were published within the last 90 days.
Affected status is inferred from published affected version ranges where available. Always verify against the vendor advisory before making production decisions.
| CVE | Severity | Published | Status | Summary |
|---|---|---|---|---|
| CVE-2026-12329 | HIGH (7.5) | 2026-06-16 | Current versionnot affected | Memory safety bug fixed in Thunderbird ESR 140.12. This vulnerability was fixed in Firefox ESR 140.12 and Thunderbird 140.12. Affected versions
|
| CVE-2026-12328 | HIGH (8.1) | 2026-06-16 | Current versionnot affected | Memory safety bugs present in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151. 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 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12. Affected versions
|
| CVE-2026-12327 | HIGH (8.1) | 2026-06-16 | Current versionnot affected | Memory safety bugs present in Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151. 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 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12. Affected versions
|
| CVE-2026-12326 | HIGH (8.1) | 2026-06-16 | Current versionnot affected | Memory safety bugs present in Firefox 151 and Thunderbird 151. 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 152 and Thunderbird 152. Affected versions
|
| CVE-2026-12324 | HIGH (7.3) | 2026-06-16 | Current versionnot affected | Incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12. Affected versions
|
| CVE-2026-12318 | HIGH (7.3) | 2026-06-16 | Current versionnot affected | Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 152 and Thunderbird 152. Affected versions
|
| CVE-2026-12317 | HIGH (7.5) | 2026-06-16 | Current versionnot affected | Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152 and Thunderbird 152. Affected versions
|
| CVE-2026-12316 | CRITICAL (9.1) | 2026-06-16 | Current versionnot affected | Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 152 and Thunderbird 152. Affected versions
|
| CVE-2026-12315 | CRITICAL (9.1) | 2026-06-16 | Current versionnot affected | Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12. Affected versions
|
| CVE-2026-12314 | HIGH (7.5) | 2026-06-16 | Current versionnot affected | Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12. Affected versions
|
| CVE-2026-12312 | HIGH (7.5) | 2026-06-16 | Current versionnot affected | Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12. Affected versions
|
| CVE-2026-12310 | HIGH (7.5) | 2026-06-16 | Current versionnot affected | Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12. Affected versions
|
| CVE-2026-12305 | HIGH (7.5) | 2026-06-16 | Current versionnot affected | Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12. Affected versions
|
| CVE-2026-12304 | CRITICAL (9.1) | 2026-06-16 | Current versionnot affected | Same-origin policy bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12. Affected versions
|
| CVE-2026-12299 | HIGH (7.5) | 2026-06-16 | Current versionnot affected | JIT miscompilation in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12. Affected versions
|
| CVE-2026-12298 | HIGH (7.5) | 2026-06-16 | Current versionnot affected | Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12. Affected versions
|
| CVE-2026-12297 | CRITICAL (9.6) | 2026-06-16 | Current versionnot affected | Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12. Affected versions
|
| CVE-2026-12296 | CRITICAL (9.6) | 2026-06-16 | Current versionnot affected | Sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12. Affected versions
|
| CVE-2026-12295 | CRITICAL (9.6) | 2026-06-16 | Current versionnot affected | Sandbox escape in the DOM: Navigation component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12. Affected versions
|
| CVE-2026-12294 | CRITICAL (9.6) | 2026-06-16 | Current versionnot affected | Sandbox escape in the DOM: Workers component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12. Affected versions
|
| CVE-2026-12293 | CRITICAL (9.8) | 2026-06-16 | Current versionnot affected | Use-after-free in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 152 and Thunderbird 152. Affected versions
|
| CVE-2026-12292 | HIGH (8.1) | 2026-06-16 | Current versionnot affected | Incorrect boundary conditions in the Web Audio component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12. Affected versions
|
| CVE-2026-12291 | HIGH (8.8) | 2026-06-16 | Current versionnot affected | Use-after-free in the Networking: HTTP component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12. Affected versions
|
| CVE-2026-12290 | HIGH (8.1) | 2026-06-16 | Current versionnot affected | Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12. Affected versions
|
| CVE-2026-12289 | HIGH (8.8) | 2026-06-16 | Current versionnot affected | Privilege escalation in the Graphics: WebRender component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12. Affected versions
|