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{"bugzilla": {"description": "onnx: ONNX: Arbitrary file write via symlink following and path traversal", "id": "2521048", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521048"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-367", "details": ["In ONNX before 1.21.0, the 'save_external_data' function builds the external-data file path from the model's external_data location field and opens it for writing without 'O_NOFOLLOW/O_EXCL', after a non-atomic 'os.path.isfile()' check. A local attacker with write access to the directory where a victim serializes external data can deterministically pre-plant a symlink that is being followed, causing the victim's write to append to any file the victim can write, e.g. ~/.ssh/authorized_keys, cron files, or application configs. Fixed in 1.21.0.", "A flaw was found in ONNX. The `save_external_data` function is vulnerable to symlink following and path traversal. A local attacker with write access to a directory where a victim serializes external data can exploit this by pre-planting a symlink. This allows the attacker to cause the victim's write operation to append to arbitrary files, potentially leading to unauthorized modification of critical system files."], "name": "CVE-2026-49114", "public_date": "2026-08-21T16:10:56Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-49114\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-49114\nhttps://github.com/onnx/onnx/security/advisories/GHSA-q56x-g2fj-4rj6\nhttps://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-233-01.json"], "threat_severity": "Important"}