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OpenAdvisories
High ALAS2-2026-3795 38 CVEs

Important: thunderbird security update (Amazon Linux 2)

Published Jul 6, 2026 · Updated Jul 7, 2026

Ecosystem: Amazon Linux

Summary

Package updates are available for Amazon Linux 2 that fix the following vulnerabilities: CVE-2026-56412: libexpat before 2.8.2 does not consider XML_TOK_DATA_CHARS in doCdataSection and thus lacks handler call depth tracking for various calls from within handlers in cases of a policy violation. Thus, a use-after-free can occur. NOTE: this issue exists because of an incomplete fix for CVE-2026-50219. CVE-2026-56408: libexpat before 2.8.2 has an integer overflow in copyString. CVE-2026-56407: libexpat before 2.8.2 has an integer overflow in doProlog that is related to storeEntityValue and entity textLen. CVE-2026-56406: libexpat before 2.8.2 has an integer overflow in XML_ParseBuffer because it lacked a check that was present in XML_Parse. CVE-2026-56405: libexpat before 2.8.2 has an integer overflow in getAttributeId. CVE-2026-56404: libexpat before 2.8.2 has an integer overflow in addBinding. CVE-2026-56403: libexpat before 2.8.2 has an integer overflow in storeAtts. CVE-2026-56211: A remote code execution vulnerability was found in libaom, the reference AV1 codec implementation. Insufficient bounds validation in the AV1 encoder's SVC (Scalable Video Coding) layer ID control allows an attacker to supply crafted video frame pixels that overlap with internal encoder layer context structures. In fork-based video processing services, an attacker can use this to hijack the cyclic refresh map pointer, brute-force the process base address via a crash oracle, and redirect control flow to achieve arbitrary command execution. Exploitation requires the target service to use libaom with SVC encoding enabled and accept attacker-supplied video frames. CVE-2026-56210: A heap-buffer-overflow read vulnerability was found in libaom, the reference AV1 codec implementation. A missing bounds check in the SVC (Scalable Video Coding) layer ID control function allows setting a spatial_layer_id exceeding the configured number of layers. This causes an out-of-bounds heap read of approximately 40,728 bytes when computing a layer context array index. An attacker who can influence SVC encoder parameters in a network-facing service could exploit this for information disclosure (heap content leak) or denial of service (segmentation fault from hitting unmapped memory). CVE-2026-56208: A heap buffer overflow vulnerability was found in libaom, the reference AV1 codec implementation. A flaw in the AV1 encoder's Look-Ahead Processing (LAP) mode causes the first-pass stats ring buffer wrap-around guard to be bypassed when g_lag_in_frames is set to 1 or higher. This results in a 232-byte out-of-bounds write on every encoded frame after the second, corrupting adjacent heap objects. An attacker who can influence encoder configuration in a transcoding service or WebRTC session could exploit this to cause a denial of service (process crash) or potentially achieve code execution. CVE-2026-56132: In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers. CVE-2026-56131: libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation. Thus, a use-after-free can occur (similar to the CVE-2026-50219 situation). CVE-2026-50219: libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_GetBuffer, XML_Parse, XML_ParseBuffer, XML_ParserFree, or XML_ParserReset from within handlers in cases of a policy violation. Thus, a use-after-free can occur, CVE-2026-12330: Incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 140.12, Firefox ESR 115.37, and Thunderbird 140.12. CVE-2026-12329: Memory safety bug fixed in Thunderbird ESR 140.12. This vulnerability was fixed in Firefox ESR 140.12 and Thunderbird 140.12. CVE-2026-12328: Memory safety bugs present in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151. 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. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12. CVE-2026-12327: Memory safety bugs present in Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151. 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. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12. CVE-2026-12325: Denial-of-service in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12. CVE-2026-12324: Incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12. CVE-2026-12314: Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12. CVE-2026-12313: Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12. CVE-2026-12312: Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12. CVE-2026-12310: Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12. CVE-2026-12309: Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12. CVE-2026-12308

Fixed packages 1

ReleasePackageFixed in
Amazon Linux · 2 thunderbird 0:140.12.0-1.amzn2.0.1

Vulnerabilities 38

References

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    https://alas.aws.amazon.com/cve/html/CVE-2026-12289.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12290.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12292.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12294.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12295.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12296.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12297.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12298.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12299.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12304.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12305.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12306.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12307.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12308.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12309.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12310.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12312.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12313.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12314.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12324.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12325.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12327.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12328.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12329.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-12330.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-50219.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-56131.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-56132.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-56208.html
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    https://alas.aws.amazon.com/cve/html/CVE-2026-56210.html