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CVE-2026-92238— Ambiguous parsing of mail headers

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.

一个恶意构造的邮件头可能导致多个字段被解析为一个，或者引发潜在的内存安全问题。该漏洞已在 Thunderbird 140.16 版本中修复。

AI Predicted 5.9 Difficulty: Hard EPSS 0.18% · P8

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

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-2026-92238

Vulnerability Information
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Vulnerability Title
Ambiguous parsing of mail headers
Source: CVE Program / CVE List V5
Vulnerability Description
A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations. 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-2026-92238

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III. Intelligence Information for CVE-2026-92238

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Vendor Advisories for CVE-2026-92238 (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-2026-92238

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