{"id":"CVE-2026-85731","published":"2026-09-16T17:18:15.833","lastModified":"2026-09-16T18:17:17.963","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.","cvssScore":8.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cwes":["CWE-22","CWE-59"],"vendors":[],"products":[],"references":[{"url":"https://github.com/oras-project/oras-go/commit/adab2f25ea95ef4e6e41f50db9266a6701399422","tags":[]},{"url":"https://github.com/oras-project/oras-go/releases/tag/v2.6.2","tags":[]},{"url":"https://github.com/oras-project/oras-go/security/advisories/GHSA-m37j-52j7-pjw7","tags":[]},{"url":"https://github.com/oras-project/oras-go/security/advisories/GHSA-m37j-52j7-pjw7","tags":[]}],"exploitRefs":[{"url":"https://github.com/oras-project/oras-go/commit/adab2f25ea95ef4e6e41f50db9266a6701399422","tags":[]},{"url":"https://github.com/oras-project/oras-go/releases/tag/v2.6.2","tags":[]},{"url":"https://github.com/oras-project/oras-go/security/advisories/GHSA-m37j-52j7-pjw7","tags":[]},{"url":"https://github.com/oras-project/oras-go/security/advisories/GHSA-m37j-52j7-pjw7","tags":[]}],"hasPoc":true,"ai":{"summary":"The flaw allows a malicious archive to create a symlink chain that can overwrite any file writable by the process, potentially leading to code execution.","exploitability":"Exploitation requires a maliciously crafted archive and the ability to pull the artifact. The attacker must have the capability to control the artifact being pulled.","blast_radius":"If exploited, this can lead to code execution and overwrite any file writable by the process, with potentially severe consequences.","remediation":"Upgrade to version 2.6.2 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","file-overwrite","symlink"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-10-01T08:43:57.178Z"}}