# Mozilla Firefox (en-US) 149.0.2

Mozilla Firefox (en-US) 149.0.2, released April 7, 2026, fixes 4 CVEs in Mozilla Firefox (en-US). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Mozilla Firefox (en-US) is 159.0, which also fixes every one of these CVEs.

- Web page: https://patchblox.com/security/fix/windows-app/mozilla.firefox-149.0.2
- Platform: Windows apps
- Released: Apr 7, 2026
- Priority: Urgent (Closes CVE-2026-5735, rated Critical)
- CVEs: 4, exploited: 0, on CISA KEV: 0
- Superseded by: [Mozilla Firefox (en-US) 159.0](https://patchblox.com/security/data/product/windows-app/mozilla-firefox-en-us.md), the latest version, which also fixes every CVE listed here

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Mozilla Firefox (en-US)](https://patchblox.com/security/data/product/windows-app/mozilla-firefox-en-us.md) |  | 149.0.2 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-5735](https://patchblox.com/security/data/cve/CVE-2026-5735.md) | Urgent | Memory safety bugs fixed in Firefox 149.0.2 and Thunderbird 149.0.2 | 9.8 | 0.0027 |  |
| [CVE-2026-5732](https://patchblox.com/security/data/cve/CVE-2026-5732.md) | High | Incorrect boundary conditions, integer overflow in the Graphics: Text component | 8.8 | 0.0036 |  |
| [CVE-2026-5734](https://patchblox.com/security/data/cve/CVE-2026-5734.md) | High | Memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2 | 9.8 | 0.0034 |  |
| [CVE-2026-5733](https://patchblox.com/security/data/cve/CVE-2026-5733.md) | High | Incorrect boundary conditions in the Graphics: WebGPU component | 8.8 | 0.0032 |  |

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Data as of 2026-11-09T13:31:49Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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