{"id":"CVE-2026-85731","revision":"e8fdfe4b53694dbb8793f005962f7f4e","records":[{"revision":"e8fdfe4b53694dbb8793f005962f7f4e","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-85731","aliases":[],"title":"oras-go: Arbitrary file write outside file.Store root via symlink-chain bypass in tar extraction (pushDir)","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.","state":0,"publishedAt":"2026-09-16T16:24:48.905+00:00","modifiedAt":"2026-09-16T17:25:07.159+00:00","affected":[{"ecosystem":"Vendor product","name":"oras-go","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"oras-project\",\n                    \"product\": \"oras-go\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 2.6.2\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://github.com/oras-project/oras-go/security/advisories/GHSA-m37j-52j7-pjw7","https://github.com/oras-project/oras-go/commit/adab2f25ea95ef4e6e41f50db9266a6701399422","https://github.com/oras-project/oras-go/releases/tag/v2.6.2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-85731","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-85731","identifiers":["CVE-2026-85731"]},"retained":false,"historicalAffected":[]}],"coverage":[]}