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.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-m37j-52j7-pjw7 oras-go: Arbitrary file write outside file.Store root via symlink-chain bypass in tar extraction (pushDir)
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 18 Sep 2026 04:45:00 +0000

Type Values Removed Values Added
First Time appeared Oras-project
Oras-project oras-go
Vendors & Products Oras-project
Oras-project oras-go

Wed, 16 Sep 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 16 Sep 2026 16:45:00 +0000

Type Values Removed Values Added
Description 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.
Title oras-go: Arbitrary file write outside file.Store root via symlink-chain bypass in tar extraction (pushDir)
Weaknesses CWE-22
CWE-59
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-09-16T17:25:07.159Z

Reserved: 2026-09-04T14:45:10.649Z

Link: CVE-2026-85731

cve-icon Vulnrichment

Updated: 2026-09-16T17:24:41.115Z

cve-icon NVD

Status : Deferred

Published: 2026-09-16T17:18:15.833

Modified: 2026-09-16T18:17:17.963

Link: CVE-2026-85731

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-18T04:30:03Z

Weaknesses