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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.

adm-zip 0.5.9 至 0.6.0 版本在提取目标位置时遵循符号链接。util/utils.js 中的 Utils.sanitize 函数仅通过将归档条目名称的字符串形式与解析后的提取根目录进行比较来强制实施路径包含检查，而 Utils.writeFileTo 函数通过 fs.openSync(path, "w", 0o666) 打开计算出的目标路径，该操作会解析符号链接，且既未设置 O_NOFOLLOW 标志，也未在写入前进行 fs.lstatSync 检查。 当目标位置的某个路径组件已经存在为一个指向提

CVSS 6.5 · Medium
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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

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 weakness: CWE-59

V. Comments for CVE-2026-76845

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