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CVE-2026-6654— Use-After-Free and Double-Free in IntoIter::drop when element drop panics

Quick assessment

Affected
Mozilla thin-vec
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.

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。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 1

VendorProduct Version RangeStatus
Mozilla thin-vec 0.2.16≤ * unaffected
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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: CVE Program / CVE List V5
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: 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
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

Vendor Product Affected Versions CPE Subscribe
Mozilla thin-vec 0.2.16 ~ * -

II. Public POCs for CVE-2026-6654

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III. Intelligence Information for CVE-2026-6654

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Vendor Advisories for CVE-2026-6654 (1)

IV. Related Vulnerabilities

Same vendor: Mozilla

V. Comments for CVE-2026-6654

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