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CVE-2026-92239— Buffer overrun in IMAP

Quick assessment

Affected
Mozilla Thunderbird
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

这段文本描述的是一个软件安全漏洞。为了提供准确的翻译，我们需要关注几个关键术语： 1. maliciously constructed IMAP line：恶意构造的 IMAP 行/指令。 2. out-of-bounds buffer read：越界缓冲区读取（OOB Read），这是内存安全中的一个常见漏洞类型，指程序读取了缓冲区边界之外的内存区域。 3. fixed in Thunderbird 140.16：在 Thunderbird 140.16 版本中已修复。 推导过程： "Maliciously co

AI Predicted 5.5 Difficulty: Moderate EPSS 0.18% · P8

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 3

VendorProduct Version RangeStatus
Mozilla Thunderbird 140.16≤ 140.* unaffected
153.3≤ 153.* unaffected
156≤ * unaffected
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I. Basic Information for CVE-2026-92239

Vulnerability Information
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Vulnerability Title
Buffer overrun in IMAP
Source: CVE Program / CVE List V5
Vulnerability Description
A maliciously constructed IMAP line could cause an out-of-bounds buffer read. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mozilla Thunderbird 140.16 ~ 140.* -

II. Public POCs for CVE-2026-92239

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III. Intelligence Information for CVE-2026-92239

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Vendor Advisories for CVE-2026-92239 (1)

Same Patch Batch · Mozilla · 2026-09-15 · 78 CVEs total

CVE-2026-92038 Mitigation bypass in the Remote Settings Client component
CVE-2026-92037 Incorrect boundary conditions in the DOM: Animation component
CVE-2026-92023 Use-after-free in the XML component
CVE-2026-92035 Sandbox escape due to incorrect boundary conditions in the Graphics component
CVE-2026-92034 Site isolation issue in the Graphics component
CVE-2026-92036 Incorrect boundary conditions in the Networking: HTTP component
CVE-2026-92039 Mitigation bypass in the DOM: Notifications component
CVE-2026-92040 Use-after-free in the JavaScript: WebAssembly component
CVE-2026-92041 Mitigation bypass in the DOM: Networking component
CVE-2026-92042 Race condition in the DOM: Content Processes component
CVE-2026-92033 Privilege escalation in Firefox for Android
CVE-2026-92032 Sandbox escape due to invalid pointer in the Graphics component
CVE-2026-92031 Information disclosure in the Graphics: ImageLib component
CVE-2026-92030 Mitigation bypass in the DOM: Copy & Paste and Drag & Drop component
CVE-2026-92029 Use-after-free in the SVG component
CVE-2026-92028 Use-after-free in the DOM: Core & HTML component
CVE-2026-92027 Use-after-free in the DOM: Streams component
CVE-2026-92026 Use-after-free in the Networking component
CVE-2026-92025 Use-after-free in the DOM: Navigation component
CVE-2026-92024 Use-after-free in the SVG component

Showing top 20 of 78 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Thunderbird
Same vendor: Mozilla

V. Comments for CVE-2026-92239

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