oras-project oras-go up to 2.6.1 Tar Extraction extractTarDirectory path traversal

Summaryinfo

A vulnerability, which was classified as critical, has been found in oras-project oras-go up to 2.6.1. This affects the function extractTarDirectory of the component Tar Extraction. Performing a manipulation results in path traversal. This vulnerability is cataloged as CVE-2026-85731. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in oras-project oras-go up to 2.6.1. This affects the function extractTarDirectory 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:

oras-go is a Go library for managing OCI artifacts. Prior to 2.6.2, content/file.Store extraction of OCI layers marked with io.deis.oras.content.unpack=true can write outside the store working directory. The pushDir path through extractTarDirectory and ensureLinkPath validates symlink targets lexically, resolveRelToBase skips its parent-symlink walk for root-level entries, and writeFile follows a terminal symlink when opening a regular file. A malicious archive can therefore create a symlink chain whose lexical target remains inside the extraction root but whose resolved target is an attacker-selected absolute path, then overwrite that target with a same-named regular-file entry even when AllowPathTraversalOnWrite is false. Pulling an attacker-controlled artifact can create or overwrite any file writable by the process and may lead to code execution. This issue is fixed in version 2.6.2.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-85731 since 09/04/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

Upgrading to version 2.6.2 eliminates this vulnerability.

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Productinfo

Type

• Project Management Software

Vendor

• oras-project

Name

• oras-go

Version

• 2.6.0
• 2.6.1

Website

• Product: https://github.com/oras-project/oras-go/

CPE 2.3info

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CPE 2.2info

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