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Vulnerability record · CVE-2026-85731 · published 16 September 2026

CVE-2026-85731: Path traversal vulnerability

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.

8.8 CVSS 3.1 High EPSS 0.63% · top 51.9% CWE-22 · Path traversalCWE-59 · Link following Deferred
8.8CVSS 3.1 base score
0.63%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
16 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

LinkTags
https://github.com/oras-project/oras-go/commit/adab2f25ea95ef4e6e41f50db9266a6701399422
https://github.com/oras-project/oras-go/releases/tag/v2.6.2
https://github.com/oras-project/oras-go/security/advisories/GHSA-m37j-52j7-pjw7
https://github.com/oras-project/oras-go/security/advisories/GHSA-m37j-52j7-pjw7

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Source: NIST National Vulnerability Database (record CVE-2026-85731), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.