Moby go-archive Tar Extraction path traversal

Summaryinfo

A vulnerability, which was classified as critical, has been found in Moby go-archive. This impacts the function Unpack/UnpackLayer/Untar/UntarUncompressed/ApplyLayer of the component Tar Extraction. Performing a manipulation results in path traversal. This vulnerability is reported as CVE-2026-17106. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, was found in Moby go-archive (affected version unknown). This affects the function Unpack/UnpackLayer/Untar/UntarUncompressed/ApplyLayer of the component Tar 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 confidentiality, integrity, and availability. The summary by CVE is:

The tar extraction routines in moby/go-archive (Unpack, UnpackLayer, Untar/UntarUncompressed, and the ApplyLayer helpers) do not confine filesystem operations to the destination directory. The extractor decides where each archive entry lands using lexical string checks and then performs the filesystem operation on a path that is resolved by the OS, so links introduced by the archive can be followed out of the destination directory. An attacker who controls the contents of an archive can create or overwrite files at arbitrary paths writable by the extracting process.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-17106 since 07/24/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/18/2026). 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.

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Productinfo

Vendor

• Moby

Name

• go-archive

Website

• Product: https://github.com/moby/go-archive/

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