# RHSA-2026:65160: thunderbird security update RHSA-2026:65160, released September 13, 2026, fixes 25 CVEs in thunderbird (version 0:140.14.0-1.el8_10). None of them is reported as exploited. Patch Radar priority: Urgent. - Web page: https://patchblox.com/security/fix/linux/rhsa-2026-65160 - Platform: Linux - Released: Sep 13, 2026 - Priority: Urgent (Closes CVE-2026-74964, rated Critical) - CVEs: 25, exploited: 0, on CISA KEV: 0 - Vendor advisory: https://access.redhat.com/errata/RHSA-2026:65160 ## Applies to | Product | Release | Fixed in | |---|---|---| | [thunderbird](https://patchblox.com/security/data/product/linux/thunderbird.md) | RHEL 8 | 0:140.14.0-1.el8_10 | ## CVEs this fix closes | CVE | Priority | Title | CVSS | EPSS | Exploitation | |---|---|---|---:|---:|---| | [CVE-2026-74964](https://patchblox.com/security/data/cve/CVE-2026-74964.md) | Urgent | Integer overflow in the Graphics component | 9.8 | 0.0068 | | | [CVE-2026-74940](https://patchblox.com/security/data/cve/CVE-2026-74940.md) | Urgent | Use-after-free in the Graphics: Text component | 9.8 | 0.0061 | | | [CVE-2026-74959](https://patchblox.com/security/data/cve/CVE-2026-74959.md) | Urgent | Mitigation bypass in the Storage: Cache API component | 9.1 | 0.0048 | | | [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 | 0.0072 | | | [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 | 0.0072 | | | [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 | 0.0050 | | | [CVE-2026-74941](https://patchblox.com/security/data/cve/CVE-2026-74941.md) | High | Privilege escalation in the Graphics: CanvasWebGL component | 8.8 | 0.0048 | | | [CVE-2026-74935](https://patchblox.com/security/data/cve/CVE-2026-74935.md) | High | Privilege escalation in the DOM: Networking component | 8.8 | 0.0045 | | | [CVE-2026-74939](https://patchblox.com/security/data/cve/CVE-2026-74939.md) | High | Privilege escalation in the DOM: Navigation component | 8.8 | 0.0045 | | | [CVE-2026-74942](https://patchblox.com/security/data/cve/CVE-2026-74942.md) | High | Privilege escalation in the Remote Settings Client component | 8.8 | 0.0045 | | | [CVE-2026-74953](https://patchblox.com/security/data/cve/CVE-2026-74953.md) | High | Privilege escalation in the Networking: Cookies component | 8.8 | 0.0044 | | | [CVE-2026-74965](https://patchblox.com/security/data/cve/CVE-2026-74965.md) | High | Privilege escalation in the Shell Integration component | 8.8 | 0.0044 | | | [CVE-2026-74945](https://patchblox.com/security/data/cve/CVE-2026-74945.md) | High | Information disclosure in the Graphics: Text component | 7.5 | 0.0044 | | | [CVE-2026-74948](https://patchblox.com/security/data/cve/CVE-2026-74948.md) | High | Information disclosure in the Graphics component | 7.5 | 0.0044 | | | [CVE-2026-74957](https://patchblox.com/security/data/cve/CVE-2026-74957.md) | High | Mitigation bypass in the Safe Browsing component | 8.1 | 0.0043 | | | [CVE-2026-74976](https://patchblox.com/security/data/cve/CVE-2026-74976.md) | High | JIT miscompilation in the JavaScript Engine: JIT component | 7.5 | 0.0042 | | | [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 | 0.0035 | | | [CVE-2026-74972](https://patchblox.com/security/data/cve/CVE-2026-74972.md) | High | Information disclosure in the DOM: Push Subscriptions component | 7.5 | 0.0035 | | | [CVE-2026-74960](https://patchblox.com/security/data/cve/CVE-2026-74960.md) | High | Site isolation issue in the WebExtensions component | 8.1 | 0.0022 | | | [CVE-2026-74962](https://patchblox.com/security/data/cve/CVE-2026-74962.md) | High | Site isolation issue in the Networking: Cookies component | 8.1 | 0.0022 | | | [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 | 0.0022 | | | [CVE-2026-74934](https://patchblox.com/security/data/cve/CVE-2026-74934.md) | High | Site isolation issue in the Graphics: CanvasWebGL component | 7.5 | 0.0021 | | | [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 | 0.0017 | | | [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 | 0.0017 | | | [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 | 0.0017 | | --- Data as of 2026-11-07T12:40:37Z 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