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CVE-2026-45384— bit7z: Arbitrary File Overwrite via Symlink Attack on Predictable Temp File During Archive Update

CVSS 6.1 · Medium EPSS 0.12% · P3

Possible ATT&CK Techniques 1AI

T1001 · Data Obfuscation

Affected Version Matrix 1

VendorProductVersion RangeStatus
rikyozbit7z< 4.0.12affected
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I. Basic Information for CVE-2026-45384

Vulnerability Information
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Vulnerability Title
bit7z: Arbitrary File Overwrite via Symlink Attack on Predictable Temp File During Archive Update
Source: NVD (National Vulnerability Database)
Vulnerability Description
bit7z is a cross-platform C++ static library that allows the compression/extraction of archive files. Prior to version 4.0.12, there is an arbitrary file overwrite vulnerability via symlink attack on predictable temp files during archive update. This issue has been patched in version 4.0.12.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: NVD (National Vulnerability Database)
Vulnerability Title
bit7z 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
bit7z是Riccardo个人开发者的一个文件压缩/解压工具。 bit7z 4.0.12之前版本存在后置链接漏洞，该漏洞源于存档更新期间通过符号链接攻击可预测临时文件导致的任意文件覆盖。
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

VendorProductAffected VersionsCPESubscribe
rikyozbit7z < 4.0.12 -

II. Public POCs for CVE-2026-45384

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III. Intelligence Information for CVE-2026-45384

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Vendor Advisories for CVE-2026-45384 (1)

Other References for CVE-2026-45384 (1)

IV. Related Vulnerabilities

Same product: bit7z
Same vendor: rikyoz
Same weakness: CWE-59

V. Comments for CVE-2026-45384

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