{"id":"CVE-2026-85731","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-85731","summary":"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…","details":"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.","published":"2026-09-16T17:18:15.833","modified":"2026-09-16T17:18:15.967","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/oras-project/oras-go/commit/adab2f25ea95ef4e6e41f50db9266a6701399422","label":"oras-project/oras-go@adab2f2"},"references":[{"type":"WEB","url":"https://github.com/oras-project/oras-go/commit/adab2f25ea95ef4e6e41f50db9266a6701399422"},{"type":"WEB","url":"https://github.com/oras-project/oras-go/releases/tag/v2.6.2"},{"type":"WEB","url":"https://github.com/oras-project/oras-go/security/advisories/GHSA-m37j-52j7-pjw7"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-16T17:18:15.967"}}