Linux · 
Oracle Linux · Security advisory · September 8, 2026
Oracle Linux · Security advisory · September 8, 2026ELSA-2026-65159-0: thunderbird security update
ELSA-2026-65159-0, released September 8, 2026, fixes 21 CVEs in thunderbird (version 0:140.14.0-1.0.1.el10_2). None of them is reported as exploited. Patch Radar priority: Urgent.
Urgent
CVEs closed
21
3 rated Critical
Exploited
0
None reported
Highest CVSS
9.8
Base score, 0 to 10
Highest EPSS
0.0071
53rd percentile
Priority of the 21 CVEs
Patch now 0
Urgent 3
High 18
Routine 0
Fixed package versions
| Product | Release | Fixed in |
|---|---|---|
| thunderbird | ol 10 | 0:140.14.0-1.0.1.el10_2 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| Urgent | CVE-2026-74964 | Integer overflow in the Graphics component | 9.8 | 0.0060 | None reported |
| Urgent | CVE-2026-74936 | Use-after-free in the JavaScript: WebAssembly component | 9.8 | 0.0040 | None reported |
| Urgent | CVE-2026-74959 | Mitigation bypass in the Storage: Cache API component | 9.1 | 0.0034 | None reported |
| High | CVE-2026-74945 | Information disclosure in the Graphics: Text component | 7.5 | 0.0071 | None reported |
| High | CVE-2026-74990 | Internally found bugs fixed in Thunderbird ESR 140.14, Thunderbird ESR 153.1 and Thunderbird 154 | 9.8 | 0.0053 | None reported |
| High | CVE-2026-74987 | Internally found bugs fixed in Thunderbird ESR 140.14, Thunderbird ESR 153.1 and Thunderbird 154 | 9.8 | 0.0052 | None reported |
| High | CVE-2026-74971 | Information disclosure in the DOM: UI Events & Focus Handling component | 7.5 | 0.0032 | None reported |
| High | CVE-2026-74976 | JIT miscompilation in the JavaScript Engine: JIT component | 7.5 | 0.0032 | None reported |
| High | CVE-2026-74948 | Information disclosure in the Graphics component | 7.5 | 0.0031 | None reported |
| High | CVE-2026-74935 | Privilege escalation in the DOM: Networking component | 8.8 | 0.0031 | None reported |
| High | CVE-2026-74939 | Privilege escalation in the DOM: Navigation component | 8.8 | 0.0030 | None reported |
| High | CVE-2026-74942 | Privilege escalation in the Remote Settings Client component | 8.8 | 0.0030 | None reported |
| High | CVE-2026-74957 | Mitigation bypass in the Safe Browsing component | 8.1 | 0.0030 | None reported |
| High | CVE-2026-74953 | Privilege escalation in the Networking: Cookies component | 8.8 | 0.0030 | None reported |
| High | CVE-2026-74972 | Information disclosure in the DOM: Push Subscriptions component | 7.5 | 0.0026 | None reported |
| High | CVE-2026-74973 | Race condition, use-after-free in the Graphics component | 7.5 | 0.0018 | None reported |
| High | CVE-2026-74960 | Site isolation issue in the WebExtensions component | 8.1 | 0.0016 | None reported |
| High | CVE-2026-74962 | Site isolation issue in the Networking: Cookies component | 8.1 | 0.0016 | None reported |
| High | CVE-2026-74934 | Site isolation issue in the Graphics: CanvasWebGL component | 7.5 | 0.0016 | None reported |
| High | CVE-2026-74974 | Same-origin policy bypass in the Graphics: ImageLib component | 7.5 | 0.0014 | None reported |
| High | CVE-2026-74963 | Same-origin policy bypass in the Networking: Cookies component | 7.5 | 0.0012 | None reported |
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