CVE-2026-6654— Use-After-Free and Double-Free in IntoIter::drop when element drop panics
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I. Basic Information for CVE-2026-6654
Vulnerability Information
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Vulnerability Title
Use-After-Free and Double-Free in IntoIter::drop when element drop panics
Source: NVD (National Vulnerability Database)
Vulnerability Description
Double-Free / Use-After-Free (UAF) in the `IntoIter::drop` and `ThinVec::clear` functions in the thin_vec crate. A panic in `ptr::drop_in_place` skips setting the length to zero.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
thin-vec 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
thin-vec是Mozilla开源的一个节省内存的向量容器。 thin-vec存在安全漏洞，该漏洞源于函数IntoIter::drop和ThinVec::clear存在双重释放或释放后重用问题，可能导致panic时跳过将长度设置为零。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-6654
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IV. Related Vulnerabilities
Same vendor: Mozilla
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Memory safety bugs fixed in Thunderbird ESR 140.10.2 and Thu - CVE-2026-8091
Incorrect boundary conditions in the Audio/Video: Playback c - CVE-2026-8090
Use-after-free in the DOM: Networking component
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