Linux · Security advisory · May 15, 2026
RHSA-2026:19348: thunderbird security update
RHSA-2026:19348, released May 15, 2026, fixes 30 CVEs in thunderbird (version 0:140.10.1-1.el9_8). None of them is reported as exploited. Patch Radar priority: High.
High
CVEs closed
30
None rated Critical
Exploited
0
None reported
Exploitation more likely
0
Vendor assessment
Highest EPSS
0.0388
90th percentile
Priority of the 30 CVEs
Patch now 0
Urgent 0
High 30
Routine 0
Fixed package versions
| Product | Release | Fixed in |
|---|---|---|
| thunderbird | RHEL 9 | 0:140.10.1-1.el9_8 |
CVEs this fix closes
| Priority | CVE | Title | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| High | CVE-2026-6770 | Other issue in the Storage: IndexedDB component | 8.8 | 0.0388 | None reported | |
| High | CVE-2026-6746 | Use-after-free in the DOM: Core & HTML component | 8.8 | 0.0095 | None reported | |
| High | CVE-2026-6785 | Memory safety bugs fixed in Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150 | 8.8 | 0.0051 | None reported | |
| High | CVE-2026-6786 | Memory safety bugs fixed in Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150 | 8.8 | 0.0050 | None reported | |
| High | CVE-2026-6757 | Invalid pointer in the JavaScript: WebAssembly component | 8.8 | 0.0049 | None reported | |
| High | CVE-2026-6750 | Privilege escalation in the Graphics: WebRender component | 8.8 | 0.0048 | None reported | |
| High | CVE-2026-8091 | Incorrect boundary conditions in the Audio/Video: Playback component | 9.8 | 0.0047 | None reported | |
| High | CVE-2026-6749 | Information disclosure due to uninitialized memory in the Graphics: Canvas2D component | 8.8 | 0.0040 | None reported | |
| High | CVE-2026-6747 | Use-after-free in the WebRTC component | 8.8 | 0.0040 | None reported | |
| High | CVE-2026-6748 | Uninitialized memory in the Audio/Video: Web Codecs component | 9.8 | 0.0040 | None reported | |
| High | CVE-2026-6772 | Incorrect boundary conditions in the Libraries component in NSS | 8.8 | 0.0039 | None reported | |
| High | CVE-2026-6754 | Use-after-free in the JavaScript Engine component | 8.8 | 0.0039 | None reported | |
| High | CVE-2026-7323 | Memory safety bugs fixed in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1 | 8.8 | 0.0038 | None reported | |
| High | CVE-2026-6759 | Use-after-free in the Widget: Cocoa component | 8.8 | 0.0036 | None reported | |
| High | CVE-2026-7320 | Information disclosure due to incorrect boundary conditions in the Audio/Video component | 8.8 | 0.0032 | None reported | |
| High | CVE-2026-7322 | Memory safety bugs fixed in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1 | 8.8 | 0.0032 | None reported | |
| High | CVE-2026-6771 | Mitigation bypass in the DOM: Security component | 9.8 | 0.0031 | None reported | |
| High | CVE-2026-6751 | Uninitialized memory in the Audio/Video: Web Codecs component | 8.8 | 0.0031 | None reported | |
| High | CVE-2026-6752 | Incorrect boundary conditions in the WebRTC component | 8.8 | 0.0031 | None reported | |
| High | CVE-2026-6753 | Incorrect boundary conditions in the WebRTC component | 8.8 | 0.0031 | None reported | |
| High | CVE-2026-7321 | Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component | 9.6 | 0.0026 | None reported | |
| High | CVE-2026-6766 | Incorrect boundary conditions in the Libraries component in NSS | 8.8 | 0.0026 | None reported | |
| High | CVE-2026-6764 | Incorrect boundary conditions in the DOM: Device Interfaces component | 8.8 | 0.0023 | None reported | |
| High | CVE-2026-6767 | Other issue in the Libraries component in NSS | 8.8 | 0.0023 | None reported | |
| High | CVE-2026-6769 | Privilege escalation in the Debugger component | 8.8 | 0.0023 | None reported |
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