Amazon Linux 2 (EOS) Security Advisory: ALAS2-2026-4057
Advisory Released Date: 2026-10-30
Advisory Updated Date: 2026-11-02
FAQs regarding Amazon Linux ALAS/CVE Severity
Sandbox escape due to use-after-free in the DOM: Content Processes component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17. (CVE-2026-100762)
Sandbox escape due to use-after-free in the DOM: Content Processes component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17. (CVE-2026-100770)
Sandbox escape due to use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17. (CVE-2026-100778)
Sandbox escape due to use-after-free in the Graphics component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17. (CVE-2026-100786)
Sandbox escape due to use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, and Firefox ESR 140.17. (CVE-2026-100811)
Sandbox escape due to use-after-free in the Widget: Gtk component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, and Firefox ESR 140.17. (CVE-2026-100818)
Sandbox escape due to incorrect boundary conditions in the XPCOM component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17. (CVE-2026-100819)
libexpat versions 2.7.2 through 2.8.5 contain an integer overflow vulnerability in expat_realloc() function on 32-bit platforms when computing allocation sizes. Attackers supplying malicious XML to applications parsing with vulnerable libexpat can cause heap buffer overflow, memory corruption, or denial of service. (CVE-2026-102633)
An attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB in size. This vulnerability was fixed in Thunderbird 157, Thunderbird 140.17, and Thunderbird 153.4. (CVE-2026-103500)
Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109704)
Use-after-free in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109706)
Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109708)
Information disclosure, privilege escalation in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109709)
Use-after-free in the Graphics: Text component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109710)
Use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109711)
Sandbox escape due to uninitialized memory in the Graphics component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109712)
Use-after-free in the Crash Reporting component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109713)
Incorrect boundary conditions in the JavaScript Engine component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109715)
Incorrect boundary conditions in the JavaScript Engine component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109716)
Use-after-free in the DOM: Bindings (WebIDL) component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109717)
Use-after-free in the XML component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109718)
Race condition, use-after-free in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109719)
JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109720)
Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109721)
JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109722)
Integer overflow in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109723)
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109724)
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109725)
Use-after-free in the SVG component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109726)
Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109727)
Use-after-free in the DOM: Animation component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109728)
Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109729)
Integer overflow in the Graphics component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109730)
Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109731)
Use-after-free in the DOM: Streams component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109732)
JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109733)
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109734)
Frame poisoning in the Layout component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109736)
Mitigation bypass in the Enterprise Policies component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109737)
Use-after-free in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109738)
Use-after-free in the Storage: Bucket File System component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109741)
Information disclosure in the PDF Viewer component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109742)
Privilege escalation in the Panning and Zooming component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109743)
Other issue in the DOM: File component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109744)
Sandbox escape due to uninitialized memory in the DOM: Web Serial component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109745)
Information disclosure in the Networking component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109751)
Use-after-free in the DOM: Workers component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109752)
Incorrect boundary conditions in the Layout component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109753)
Incorrect boundary conditions in the DOM: Editor component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109754)
Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109756)
Sandbox escape due to race condition in the Networking component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109757)
Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109759)
Mitigation bypass in the Networking: HTTP component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109760)
Incorrect boundary conditions in the SVG component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109762)
Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109763)
Mitigation bypass in the Enterprise Policies component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109764)
Race condition, use-after-free in the Graphics: Text component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109765)
Mitigation bypass in the Enterprise Policies component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109766)
Information disclosure in the Networking component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109767)
Spoofing issue in the DOM: Web Serial component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109770)
Denial-of-service in the WebRTC component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109775)
Race condition in the XPCOM component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109776)
Information disclosure in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109777)
Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109778)
Denial-of-service in the Printing: Output component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109781)
Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox ESR 153.5. (CVE-2026-109782)
Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox ESR 153.5. (CVE-2026-109783)
A malicious, compromised, or MITM-controlled Exchange server can return a single well-formed SOAP response containing an element with enough attributes to keep Thunderbird's main thread CPU-bound for seconds to hours. This vulnerability was fixed in Thunderbird 158 and Thunderbird 153.5. (CVE-2026-110249)
When setting up an account, Thunderbird's Exchange AutoDiscover lookup also queried the domain's AutoDiscover service over plain HTTP. Due to a bug, that unencrypted request included the credentials the user had entered, allowing a network attacker to obtain the user's password. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1. (CVE-2026-113866)
Thunderbird did not escape attribute values when serializing outgoing XMPP stanzas. Because values from incoming requests were echoed back in automatic replies, a remote XMPP user could send a crafted request that caused Thunderbird to inject arbitrary stanzas into the user's connection, which the server would then process as if sent by the user. This could be used to send messages or change contact and subscription settings on behalf of the user, without any interaction. This bug only affects Thunderbird's chat feature with XMPP accounts. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1. (CVE-2026-113867)
When authenticating to a POP3 or SMTP server using NTLM, Thunderbird did not check whether the server's challenge was valid base64. A malicious server could send a challenge that caused Thunderbird to include uninitialized heap memory in its NTLM response, disclosing that memory to the server. A challenge consisting only of base64 padding also caused an out-of-bounds read, crashing Thunderbird. This affected accounts configured to use NTLM or GSSAPI authentication. The uninitialized memory disclosure only affected NTLM. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1. (CVE-2026-113868)
Expat through 2.8.4 fails to validate low surrogates following high surrogates in UTF-16 input, allowing malformed UTF-16 sequences to be accepted. Attackers can craft UTF-16 encoded XML with lone high surrogates that consume following code units, hiding markup characters from the parser and enabling XML injection attacks. (CVE-2026-93990)
Affected Packages:
thunderbird
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update thunderbird or yum update --advisory ALAS2-2026-4057 to update your system.
aarch64:
thunderbird-153.5.1-1.amzn2.0.1.aarch64
src:
thunderbird-153.5.1-1.amzn2.0.1.src
x86_64:
thunderbird-153.5.1-1.amzn2.0.1.x86_64