CVE-2026-103500— Heap buffer overflow opening large email
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.
攻击者可以通过诱使用户打开一封大小大于或等于 2GB 的电子邮件，从而触发堆缓冲区溢出漏洞。该漏洞已在 Thunderbird 157、Thunderbird 140.17 和 Thunderbird 153.4 中修复。
Possible ATT&CK Techniques 1 AI
T1203 · Exploitation for Client ExecutionAffected Version Matrix 3
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Mozilla | Thunderbird | 140.17≤ 140.* |
unaffected |
153.4≤ 153.* |
unaffected | ||
157≤ * |
unaffected |
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I. Basic Information for CVE-2026-103500
Vulnerability Information
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Vulnerability Title
Heap buffer overflow opening large email
Source: CVE Program / CVE List V5
Vulnerability Description
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.
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 | 140.17 ~ 140.* | - |
|
II. Public POCs for CVE-2026-103500
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-103500 (3)
IV. Related Vulnerabilities
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-
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Sandbox escape due to use-after-free in the DOM: Core & HTML
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-
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Mitigation bypass in the DOM: Navigation component -
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Use-after-free in the DOM: UI Events & Focus Handling compon -
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Mitigation bypass in the DOM: Security component -
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Mitigation bypass in the Bookmarks & History component
V. Comments for CVE-2026-103500
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