Mozilla
Firefox
Mozilla web browser focused on open standards and privacy.
115.34.1
- Release date
- April 07, 2026
- CVE status
- 25 visible CVEs
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 |
|---|---|---|
| 115.34.1 | 2026-04-07 | Release Notes |
| 115.34.0 | 2026-03-24 | Release Notes |
| 115.33.0 | 2026-02-24 | Release Notes |
Vulnerability tracking
Review curated CVEs for this product and see whether the current version is marked affected. Only CVEs with a CVSS score of 7.0 or higher and published in the last 90 days are shown.
| CVE | Severity | Published | Status | Summary |
|---|---|---|---|---|
| CVE-2026-5735 | CRITICAL (9.8) | 2026-04-07 | Current versionaffected | 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. Affected versions
|
| CVE-2026-5734 | CRITICAL (9.8) | 2026-04-07 | Current versionaffected | 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. Affected versions
|
| CVE-2026-5733 | HIGH (8.8) | 2026-04-07 | Current versionaffected | Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 149.0.2 and Thunderbird 149.0.2. Affected versions
|
| CVE-2026-5732 | HIGH (8.8) | 2026-04-07 | Current versionaffected | 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. Affected versions
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| CVE-2026-5731 | CRITICAL (9.8) | 2026-04-07 | Current versionnot affected | 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. Affected versions
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| CVE-2026-4729 | CRITICAL (9.8) | 2026-03-24 | Current versionaffected | 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. Affected versions
|
| CVE-2026-4727 | HIGH (7.5) | 2026-03-24 | Current versionaffected | Denial-of-service in the Libraries component in NSS. This vulnerability was fixed in Firefox 149 and Thunderbird 149. Affected versions
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| CVE-2026-4726 | HIGH (7.5) | 2026-03-24 | Current versionaffected | Denial-of-service in the XML component. This vulnerability was fixed in Firefox 149 and Thunderbird 149. Affected versions
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| CVE-2026-4725 | CRITICAL (10.0) | 2026-03-24 | Current versionaffected | Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149 and Thunderbird 149. Affected versions
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| CVE-2026-4724 | CRITICAL (9.1) | 2026-03-24 | Current versionaffected | Undefined behavior in the Audio/Video component. This vulnerability was fixed in Firefox 149 and Thunderbird 149. Affected versions
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| CVE-2026-4723 | CRITICAL (9.8) | 2026-03-24 | Current versionaffected | Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 149 and Thunderbird 149. Affected versions
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| CVE-2026-4722 | HIGH (8.8) | 2026-03-24 | Current versionaffected | Privilege escalation in the IPC component. This vulnerability was fixed in Firefox 149 and Thunderbird 149. Affected versions
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| CVE-2026-4721 | CRITICAL (9.8) | 2026-03-24 | Current versionaffected | 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. Affected versions
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| CVE-2026-4720 | CRITICAL (9.8) | 2026-03-24 | Current versionaffected | 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. Affected versions
|
| CVE-2026-4719 | HIGH (7.5) | 2026-03-24 | Current versionaffected | 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. Affected versions
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| CVE-2026-4718 | HIGH (8.1) | 2026-03-24 | Current versionaffected | Undefined behavior in the WebRTC: Signaling component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9. Affected versions
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| CVE-2026-4717 | CRITICAL (9.8) | 2026-03-24 | Current versionaffected | Privilege escalation in the Netmonitor component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9. Affected versions
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| CVE-2026-4716 | CRITICAL (9.1) | 2026-03-24 | Current versionaffected | Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9. Affected versions
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| CVE-2026-4715 | CRITICAL (9.1) | 2026-03-24 | Current versionaffected | Uninitialized memory in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9. Affected versions
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| CVE-2026-4714 | HIGH (7.5) | 2026-03-24 | Current versionaffected | Incorrect boundary conditions in the Audio/Video component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9. Affected versions
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| CVE-2026-4713 | HIGH (7.5) | 2026-03-24 | Current versionaffected | Incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9. Affected versions
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| CVE-2026-4712 | HIGH (7.5) | 2026-03-24 | Current versionaffected | Information disclosure in the Widget: Cocoa component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9. Affected versions
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| CVE-2026-4711 | CRITICAL (9.8) | 2026-03-24 | Current versionaffected | Use-after-free in the Widget: Cocoa component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9. Affected versions
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| CVE-2026-4710 | CRITICAL (9.8) | 2026-03-24 | Current versionaffected | Incorrect boundary conditions in the Audio/Video component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9. Affected versions
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| CVE-2026-4709 | HIGH (7.5) | 2026-03-24 | Current versionaffected | Incorrect boundary conditions in the Audio/Video: GMP component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9. Affected versions
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