Summary
Package updates are available for Amazon Linux 2 that fix the following vulnerabilities: CVE-2026-6786: Memory safety bugs present in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. CVE-2026-6785: Memory safety bugs present in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. CVE-2026-6776: Incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10. CVE-2026-6772: Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, and Firefox ESR 140.10. CVE-2026-6771: Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10. CVE-2026-6770: Other issue in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10. CVE-2026-6769: Privilege escalation in the Debugger component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10. CVE-2026-6767: Other issue in the Libraries component in NSS. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, and Firefox ESR 140.10. CVE-2026-6766: Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. CVE-2026-6765: Information disclosure in the Form Autofill component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10. CVE-2026-6764: Incorrect boundary conditions in the DOM: Device Interfaces component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10. CVE-2026-6763: Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10. CVE-2026-6762: Spoofing issue in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, and Firefox ESR 140.10. CVE-2026-6761: Privilege escalation in the Networking component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10. CVE-2026-6757: Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10. CVE-2026-6754: Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, and Firefox ESR 140.10. CVE-2026-6753: Incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10. CVE-2026-6752: Incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, and Firefox ESR 140.10. CVE-2026-6751: Uninitialized memory in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10. CVE-2026-6750: Privilege escalation in the Graphics: WebRender component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, and Firefox ESR 140.10. CVE-2026-6749: Information disclosure due to uninitialized memory in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, and Firefox ESR 140.10. CVE-2026-6748: Uninitialized memory in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10. CVE-2026-6747: Use-after-free in the WebRTC component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10. CVE-2026-6746: Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, and Firefox ESR 140.10. CVE-2026-6654: Double-Free / Use-After-Free (UAF) in the `IntoIter::drop` and `ThinVec::clear` functions in the thin_vec crate. A panic in `ptr::drop_in_place` skips setting the length to zero.
Fixed packages 1
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux · 2 | thunderbird | 0:140.10.0-1.amzn2.0.1 |
Vulnerabilities 25
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Critical 9.8
Uninitialized memory in the Audio/Video: Web Codecs component
Uninitialized memory in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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Critical 9.8
Mitigation bypass in the DOM: Security component
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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High 8.8
Privilege escalation in the Graphics: WebRender component
Privilege escalation in the Graphics: WebRender component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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High 8.8
Privilege escalation in the Networking component
Privilege escalation in the Networking component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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High 8.8
Privilege escalation in the Debugger component
Privilege escalation in the Debugger component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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High 7.8
Incorrect boundary conditions in the WebRTC: Networking component
Incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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High 7.5
Use-after-free in the DOM: Core & HTML component
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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High 7.5
Use-after-free in the WebRTC component
Use-after-free in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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High 7.5
Information disclosure due to uninitialized memory in the Graphics: Canvas2D component
Information disclosure due to uninitialized memory in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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High 7.5
Use-after-free in the JavaScript Engine component
Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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High 7.5
Incorrect boundary conditions in the Libraries component in NSS
Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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High 7.5
Incorrect boundary conditions in the Libraries component in NSS
Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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High 7.5
Memory safety bugs fixed in Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150
Memory safety bugs present in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited…
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High 7.5
Memory safety bugs fixed in Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150
Memory safety bugs present in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary co…
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High 7.3
Uninitialized memory in the Audio/Video: Web Codecs component
Uninitialized memory in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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High 7.3
Incorrect boundary conditions in the WebRTC component
Incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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High 7.3
Incorrect boundary conditions in the WebRTC component
Incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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Medium 6.5
Mitigation bypass in the File Handling component
Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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Medium 6.5
Incorrect boundary conditions in the DOM: Device Interfaces component
Incorrect boundary conditions in the DOM: Device Interfaces component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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Medium 6.5CVE-2026-6770 Public exploit
Other issue in the Storage: IndexedDB component
Other issue in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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Medium 6.3
Invalid pointer in the JavaScript: WebAssembly component
Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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Medium 6.3
Spoofing issue in the DOM: Core & HTML component
Spoofing issue in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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Medium 5.3CVE-2026-6765 Public exploit
Information disclosure in the Form Autofill component
Information disclosure in the Form Autofill component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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Medium 5.3
Other issue in the Libraries component in NSS
Other issue in the Libraries component in NSS. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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Medium 5.1
Use-After-Free and Double-Free in IntoIter::drop when element drop panics
Double-Free / Use-After-Free (UAF) in the `IntoIter::drop` and `ThinVec::clear` functions in the thin_vec crate. A panic in `ptr::drop_in_place` skips setting the length to zero.
References
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6654.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6746.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6747.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6748.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6749.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6750.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6751.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6752.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6753.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6754.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6757.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6761.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6762.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6763.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6764.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6765.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6766.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6767.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6769.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6770.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6771.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6772.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6776.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6785.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-6786.html