# RHSA-2026:64813: firefox security update RHSA-2026:64813, released August 25, 2026, fixes 31 CVEs in firefox (version 140.14.0-1.el10_0). None of them is reported as exploited. Patch Radar priority: Urgent. - Web page: https://patchblox.com/security/fix/linux/rhsa-2026-64813 - Platform: Linux - Released: Aug 25, 2026 - Priority: Urgent (Closes CVE-2026-74943, rated Critical) - CVEs: 31, exploited: 0, on CISA KEV: 0 - Vendor advisory: https://access.redhat.com/errata/RHSA-2026:64813 ## Applies to | Product | Release | Fixed in | |---|---|---| | [firefox](https://patchblox.com/security/data/product/linux/firefox.md) | RHEL 10 | 140.14.0-1.el10_0 | ## CVEs this fix closes | CVE | Priority | Title | CVSS | EPSS | Exploitation | |---|---|---|---:|---:|---| | [CVE-2026-74943](https://patchblox.com/security/data/cve/CVE-2026-74943.md) | Urgent | Use-after-free in the Graphics: ImageLib component | 9.8 | 0.0096 | | | [CVE-2026-74964](https://patchblox.com/security/data/cve/CVE-2026-74964.md) | Urgent | Integer overflow in the Graphics component | 9.8 | 0.0060 | | | [CVE-2026-74940](https://patchblox.com/security/data/cve/CVE-2026-74940.md) | Urgent | Use-after-free in the Graphics: Text component | 9.8 | 0.0041 | | | [CVE-2026-74936](https://patchblox.com/security/data/cve/CVE-2026-74936.md) | Urgent | Use-after-free in the JavaScript: WebAssembly component | 9.8 | 0.0040 | | | [CVE-2026-74944](https://patchblox.com/security/data/cve/CVE-2026-74944.md) | Urgent | Use-after-free in the DOM: Core & HTML component | 9.8 | 0.0040 | | | [CVE-2026-74959](https://patchblox.com/security/data/cve/CVE-2026-74959.md) | Urgent | Mitigation bypass in the Storage: Cache API component | 9.1 | 0.0034 | | | [CVE-2026-74945](https://patchblox.com/security/data/cve/CVE-2026-74945.md) | High | Information disclosure in the Graphics: Text component | 7.5 | 0.0071 | | | [CVE-2026-74990](https://patchblox.com/security/data/cve/CVE-2026-74990.md) | High | Internally found bugs fixed in Thunderbird ESR 140.14, Thunderbird ESR 153.1 and Thunderbird 154 | 9.8 | 0.0053 | | | [CVE-2026-74987](https://patchblox.com/security/data/cve/CVE-2026-74987.md) | High | Internally found bugs fixed in Thunderbird ESR 140.14, Thunderbird ESR 153.1 and Thunderbird 154 | 9.8 | 0.0052 | | | [CVE-2026-74969](https://patchblox.com/security/data/cve/CVE-2026-74969.md) | High | Use-after-free in the Layout: Text and Fonts component | 8.8 | 0.0040 | | | [CVE-2026-74946](https://patchblox.com/security/data/cve/CVE-2026-74946.md) | High | Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component | 8.8 | 0.0033 | | | [CVE-2026-74983](https://patchblox.com/security/data/cve/CVE-2026-74983.md) | High | Mitigation bypass in the Data Loss Prevention component | 8.1 | 0.0033 | | | [CVE-2026-74971](https://patchblox.com/security/data/cve/CVE-2026-74971.md) | High | Information disclosure in the DOM: UI Events & Focus Handling component | 7.5 | 0.0032 | | | [CVE-2026-74941](https://patchblox.com/security/data/cve/CVE-2026-74941.md) | High | Privilege escalation in the Graphics: CanvasWebGL component | 8.8 | 0.0032 | | | [CVE-2026-74976](https://patchblox.com/security/data/cve/CVE-2026-74976.md) | High | JIT miscompilation in the JavaScript Engine: JIT component | 7.5 | 0.0032 | | | [CVE-2026-74949](https://patchblox.com/security/data/cve/CVE-2026-74949.md) | High | Privilege escalation due to use-after-free in the Graphics: Canvas2D component | 8.8 | 0.0032 | | | [CVE-2026-74948](https://patchblox.com/security/data/cve/CVE-2026-74948.md) | High | Information disclosure in the Graphics component | 7.5 | 0.0031 | | | [CVE-2026-74935](https://patchblox.com/security/data/cve/CVE-2026-74935.md) | High | Privilege escalation in the DOM: Networking component | 8.8 | 0.0031 | | | [CVE-2026-74939](https://patchblox.com/security/data/cve/CVE-2026-74939.md) | High | Privilege escalation in the DOM: Navigation component | 8.8 | 0.0030 | | | [CVE-2026-74942](https://patchblox.com/security/data/cve/CVE-2026-74942.md) | High | Privilege escalation in the Remote Settings Client component | 8.8 | 0.0030 | | | [CVE-2026-74965](https://patchblox.com/security/data/cve/CVE-2026-74965.md) | High | Privilege escalation in the Shell Integration component | 8.8 | 0.0030 | | | [CVE-2026-74957](https://patchblox.com/security/data/cve/CVE-2026-74957.md) | High | Mitigation bypass in the Safe Browsing component | 8.1 | 0.0030 | | | [CVE-2026-74953](https://patchblox.com/security/data/cve/CVE-2026-74953.md) | High | Privilege escalation in the Networking: Cookies component | 8.8 | 0.0030 | | | [CVE-2026-74972](https://patchblox.com/security/data/cve/CVE-2026-74972.md) | High | Information disclosure in the DOM: Push Subscriptions component | 7.5 | 0.0026 | | | [CVE-2026-74973](https://patchblox.com/security/data/cve/CVE-2026-74973.md) | High | Race condition, use-after-free in the Graphics component | 7.5 | 0.0018 | | | [CVE-2026-74960](https://patchblox.com/security/data/cve/CVE-2026-74960.md) | High | Site isolation issue in the WebExtensions component | 8.1 | 0.0016 | | | [CVE-2026-74962](https://patchblox.com/security/data/cve/CVE-2026-74962.md) | High | Site isolation issue in the Networking: Cookies component | 8.1 | 0.0016 | | | [CVE-2026-74934](https://patchblox.com/security/data/cve/CVE-2026-74934.md) | High | Site isolation issue in the Graphics: CanvasWebGL component | 7.5 | 0.0016 | | | [CVE-2026-74974](https://patchblox.com/security/data/cve/CVE-2026-74974.md) | High | Same-origin policy bypass in the Graphics: ImageLib component | 7.5 | 0.0014 | | | [CVE-2026-74963](https://patchblox.com/security/data/cve/CVE-2026-74963.md) | High | Same-origin policy bypass in the Networking: Cookies component | 7.5 | 0.0012 | | | [CVE-2026-74967](https://patchblox.com/security/data/cve/CVE-2026-74967.md) | High | Same-origin policy bypass in the Audio/Video: Playback component | 7.5 | 0.0012 | | --- Data as of 2026-11-07T18:46:35Z UTC. 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