{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.6.2"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "adab2f25ea95ef4e6e41f50db9266a6701399422"
            },
            {
              "fixed": "105715ee12eac6895ec736a075285c34d9f2eeb6"
            }
          ],
          "repo": "https://github.com/oras-project/oras-go",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-m37j-52j7-pjw7"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-22",
      "CWE-59"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85731.json"
  },
  "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.",
  "id": "CVE-2026-85731",
  "modified": "2026-09-18T03:30:16.148387016Z",
  "published": "2026-09-16T16:24:48.905Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/oras-project/oras-go/releases/tag/v2.6.2"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85731.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/oras-project/oras-go/security/advisories/GHSA-m37j-52j7-pjw7"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-85731"
    },
    {
      "type": "FIX",
      "url": "https://github.com/oras-project/oras-go/commit/adab2f25ea95ef4e6e41f50db9266a6701399422"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "oras-go: Arbitrary file write outside file.Store root via symlink-chain bypass in tar extraction (pushDir)"
}