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

Quick assessment

Affected

rikyoz bit7z

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.

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。

CVSS 6.1 · Medium EPSS 0.12% · P2 Updated Jun 13, 2026

Possible ATT&CK Techniques 1 AI

T1001 · Data Obfuscation

Affected Version Matrix 1

Vendor	Product	Version Range	Status
rikyoz	bit7z	`< 4.0.12`	affected

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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: CVE Program / CVE List V5

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: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

Source: CVE Program / CVE List V5

Vulnerability Type

在文件访问前对链接解析不恰当(链接跟随)

Source: CVE Program / CVE List V5

Vulnerability Title

bit7z 后置链接漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

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
rikyoz	bit7z	< 4.0.12	-

II. Public POCs for CVE-2026-45384

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-45384

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Vendor Advisories for CVE-2026-45384 (1)

🔗 Arbitrary File Overwrite via Symlink Attack on Predictable Temp File During Archive Update · Advisory · rikyoz/bit7z · GitHub Read full article x_refsource_CONFIRM

Other References for CVE-2026-45384 (1)

🔗 Release Bit7z v4.0.12 · rikyoz/bit7z · GitHub Read full article x_refsource_MISC

https://www.cve.org/CVERecord?id=CVE-2026-45384

IV. Related Vulnerabilities

Same product: bit7z

Same vendor: rikyoz

Same weakness: CWE-59