Linux · Security advisory · September 10, 2026
RHSA-2026:65633: thunderbird security update
RHSA-2026:65633, released September 10, 2026, fixes 21 CVEs in thunderbird (version 140.14.0-1.el10_0). None of them is reported as exploited. Patch Radar priority: Urgent.
Urgent
CVEs closed
21
3 rated Critical
Exploited
0
None reported
Exploitation more likely
0
Vendor assessment
Highest EPSS
0.0072
53rd percentile
Priority of the 21 CVEs
Patch now 0
Urgent 3
High 18
Routine 0
Fixed package versions
| Product | Release | Fixed in |
|---|---|---|
| thunderbird | RHEL 10 | 140.14.0-1.el10_0 |
CVEs this fix closes
| Priority | CVE | Title | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| Urgent | CVE-2026-74964 | Integer overflow in the Graphics component | 9.8 | 0.0068 | None reported | |
| Urgent | CVE-2026-74936 | Use-after-free in the JavaScript: WebAssembly component | 9.8 | 0.0059 | None reported | |
| Urgent | CVE-2026-74959 | Mitigation bypass in the Storage: Cache API component | 9.1 | 0.0048 | None reported | |
| High | CVE-2026-74987 | Internally found bugs fixed in Thunderbird ESR 140.14, Thunderbird ESR 153.1 and Thunderbird 154 | 9.8 | 0.0072 | None reported | |
| High | CVE-2026-74990 | Internally found bugs fixed in Thunderbird ESR 140.14, Thunderbird ESR 153.1 and Thunderbird 154 | 9.8 | 0.0072 | None reported | |
| High | CVE-2026-74935 | Privilege escalation in the DOM: Networking component | 8.8 | 0.0045 | None reported | |
| High | CVE-2026-74939 | Privilege escalation in the DOM: Navigation component | 8.8 | 0.0045 | None reported | |
| High | CVE-2026-74942 | Privilege escalation in the Remote Settings Client component | 8.8 | 0.0045 | None reported | |
| High | CVE-2026-74953 | Privilege escalation in the Networking: Cookies component | 8.8 | 0.0044 | None reported | |
| High | CVE-2026-74945 | Information disclosure in the Graphics: Text component | 7.5 | 0.0044 | None reported | |
| High | CVE-2026-74948 | Information disclosure in the Graphics component | 7.5 | 0.0044 | None reported | |
| High | CVE-2026-74957 | Mitigation bypass in the Safe Browsing component | 8.1 | 0.0043 | None reported | |
| High | CVE-2026-74976 | JIT miscompilation in the JavaScript Engine: JIT component | 7.5 | 0.0042 | None reported | |
| High | CVE-2026-74971 | Information disclosure in the DOM: UI Events & Focus Handling component | 7.5 | 0.0035 | None reported | |
| High | CVE-2026-74972 | Information disclosure in the DOM: Push Subscriptions component | 7.5 | 0.0035 | None reported | |
| High | CVE-2026-74960 | Site isolation issue in the WebExtensions component | 8.1 | 0.0022 | None reported | |
| High | CVE-2026-74962 | Site isolation issue in the Networking: Cookies component | 8.1 | 0.0022 | None reported | |
| High | CVE-2026-74973 | Race condition, use-after-free in the Graphics component | 7.5 | 0.0022 | None reported | |
| High | CVE-2026-74934 | Site isolation issue in the Graphics: CanvasWebGL component | 7.5 | 0.0021 | None reported | |
| High | CVE-2026-74974 | Same-origin policy bypass in the Graphics: ImageLib component | 7.5 | 0.0017 | None reported | |
| High | CVE-2026-74963 | Same-origin policy bypass in the Networking: Cookies component | 7.5 | 0.0017 | None reported |
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