cthackers adm-zip up to 0.6.0 Extraction util/utils.js Utils.sanitize path traversal

Summaryinfo

A vulnerability was found in cthackers adm-zip up to 0.6.0. It has been classified as problematic. The impacted element is the function Utils.sanitize of the file util/utils.js of the component Extraction. Performing a manipulation results in path traversal. This vulnerability is known as CVE-2026-76845. Attacking locally is a requirement. No exploit is available.

Detailsinfo

A vulnerability was found in cthackers adm-zip up to 0.6.0. It has been classified as problematic. This affects the function Utils.sanitize of the file util/utils.js of the component Extraction. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on integrity. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-76845 since 08/19/2026. The exploitability is told to be easy. An attack has to be approached locally. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• cthackers

Name

• adm-zip

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6.0

CPE 2.3info

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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