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CVE-2026-76845— adm-zip 0.5.9 through 0.6.0 Arbitrary File Overwrite via Symlink Following on Extraction

Quick assessment

Affected
cthackers adm-zip
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.

The Brain ADM-ZIP是The Brain个人开发者的一款数据压缩与解压缩处理工具。 The Brain ADM-ZIP 0.5.9版本至0.6.0版本存在后置链接漏洞，该漏洞源于在文件提取过程中对符号链接处理不当，导致攻击者可能利用符号链接将内容写入提取目录之外，从而覆盖任意文件。

CVSS 6.5 · Medium EPSS 0.17% · P6

Affected Version Matrix 1

VendorProduct Version RangeStatus
cthackers adm-zip 0.5.9≤ 0.6.0 affected
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I. Basic Information for CVE-2026-76845

Vulnerability Information
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Vulnerability Title
adm-zip 0.5.9 through 0.6.0 Arbitrary File Overwrite via Symlink Following on Extraction
Source: CVE Program / CVE List V5
Vulnerability Description
adm-zip 0.5.9 through 0.6.0 follows symbolic links at the extraction destination. Utils.sanitize in util/utils.js enforces containment by comparing only the string form of an archive entry name against the resolved extraction root, and Utils.writeFileTo opens the computed destination with fs.openSync(path, "w", 0o666), which resolves symbolic links and carries neither O_NOFOLLOW nor a pre-write fs.lstatSync check. When a path component at the destination already exists as a symbolic link pointing outside the extraction root, extractAllTo, extractAllToAsync and extractEntryTo write the entry contents through that link and then chmod its target, placing attacker-controlled content in a file outside the root without any traversal sequence appearing in the archive. Reaching the write requires overwrite to be enabled, because the preceding fs.existsSync check also resolves the link and otherwise declines. An attacker able to create a symbolic link inside a shared, reused or predictable extraction directory, such as a temporary directory or a continuous integration workspace, can overwrite any file the extracting process is permitted to write.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
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
The Brain ADM-ZIP 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
The Brain ADM-ZIP是The Brain个人开发者的一款数据压缩与解压缩处理工具。 The Brain ADM-ZIP 0.5.9版本至0.6.0版本存在后置链接漏洞，该漏洞源于在文件提取过程中对符号链接处理不当，导致攻击者可能利用符号链接将内容写入提取目录之外，从而覆盖任意文件。
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
cthackers adm-zip 0.5.9 ~ 0.6.0 -

II. Public POCs for CVE-2026-76845

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III. Intelligence Information for CVE-2026-76845

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Other References for CVE-2026-76845 (3)

IV. Related Vulnerabilities

Same product: adm-zip
Same vendor: cthackers
Same weakness: CWE-59

V. Comments for CVE-2026-76845

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