Linux · Security advisory · August 6, 2026
RLSA-2026:49921: thunderbird security update
RLSA-2026:49921, released August 6, 2026, fixes 33 CVEs in thunderbird (version 0:140.13.0-1.el9_8). None of them is reported as exploited. Patch Radar priority: Urgent.
Urgent
CVEs closed
33
22 rated Critical
Exploited
0
None reported
Exploitation more likely
0
Vendor assessment
Highest EPSS
0.0087
58th percentile
Priority of the 33 CVEs
Patch now 0
Urgent 22
High 11
Routine 0
Fixed package versions
| Product | Release | Fixed in |
|---|---|---|
| thunderbird | rocky 9 | 0:140.13.0-1.el9_8 |
CVEs this fix closes
| Priority | CVE | Title | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| Urgent | CVE-2026-16357 | Incorrect boundary conditions in the Graphics component | 9.8 | 0.0087 | None reported | |
| Urgent | CVE-2026-16363 | JIT miscompilation in the JavaScript: WebAssembly component | 9.8 | 0.0064 | None reported | |
| Urgent | CVE-2026-16369 | Integer overflow in the JavaScript: WebAssembly component | 9.8 | 0.0064 | None reported | |
| Urgent | CVE-2026-16412 | Memory safety bugs fixed in Thunderbird ESR 140.13 and Thunderbird 153 | 9.8 | 0.0061 | None reported | |
| Urgent | CVE-2026-16350 | Incorrect boundary conditions in the Audio/Video: cubeb component | 9.8 | 0.0060 | None reported | |
| Urgent | CVE-2026-16353 | Invalid pointer in the DOM: Bindings (WebIDL) component | 9.8 | 0.0060 | None reported | |
| Urgent | CVE-2026-16355 | JIT miscompilation in the JavaScript Engine: JIT component | 9.8 | 0.0060 | None reported | |
| Urgent | CVE-2026-16351 | Sandbox escape due to use-after-free in the DOM: Navigation component | 9.8 | 0.0058 | None reported | |
| Urgent | CVE-2026-16352 | Sandbox escape due to use-after-free in the Disability Access APIs component | 9.8 | 0.0058 | None reported | |
| Urgent | CVE-2026-16356 | Sandbox escape due to use-after-free in the Disability Access APIs component | 9.8 | 0.0058 | None reported | |
| Urgent | CVE-2026-16361 | Memory safety bugs fixed in Thunderbird ESR 140.13 | 9.8 | 0.0057 | None reported | |
| Urgent | CVE-2026-16377 | Mitigation bypass in the PDF Viewer component | 9.8 | 0.0057 | None reported | |
| Urgent | CVE-2026-16383 | Mitigation bypass in the DOM: Networking component | 9.8 | 0.0057 | None reported | |
| Urgent | CVE-2026-16359 | Incorrect boundary conditions in the Audio/Video: GMP component | 9.1 | 0.0047 | None reported | |
| Urgent | CVE-2026-16360 | Memory safety bugs fixed in Thunderbird ESR 140.13 and Thunderbird 153 | 9.8 | 0.0047 | None reported | |
| Urgent | CVE-2026-16390 | Mitigation bypass in the Enterprise Policies component | 9.1 | 0.0044 | None reported | |
| Urgent | CVE-2026-16368 | Incorrect boundary conditions in the JavaScript: WebAssembly component | 9.8 | 0.0039 | None reported | |
| Urgent | CVE-2026-16358 | Site isolation issue in the Graphics: WebRender component | 9.8 | 0.0030 | None reported | |
| Urgent | CVE-2026-16349 | Same-origin policy bypass in the DOM: Navigation component | 9.8 | 0.0030 | None reported | |
| Urgent | CVE-2026-16375 | Site isolation issue in the Networking: HTTP component | 9.8 | 0.0029 | None reported | |
| Urgent | CVE-2026-16387 | Site isolation issue in the Networking component | 9.8 | 0.0028 | None reported | |
| Urgent | CVE-2026-16381 | Same-origin policy bypass in the Networking: DNS component | 9.1 | 0.0023 | None reported | |
| High | CVE-2026-14899 | Off-by-one out of bounds read in MIME header parser for forwarding | 8.8 | 0.0047 | None reported | |
| High | CVE-2026-16354 | Information disclosure in the Graphics: ImageLib component | 8.8 | 0.0047 | None reported | |
| High | CVE-2026-16396 | Privilege escalation in WebExtensions | 8.8 | 0.0045 | None reported |
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