{"id":"CVE-2026-91771","title":"Weights & Biases wandb before 0.29.0 fails to validate the file name from server responses in the File.download function, allowing path traversal attacks","summary":"Weights & Biases wandb before 0.29.0 fails to validate the file name from server responses in the File.download function, allowing path traversal attacks. Attackers controlling the backend can supply file names with directory traversal s…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cwe":["CWE-22"],"vendor":"wandb","product":"wandb","affected":["wandb < 0.29.0"],"published":"2026-09-15","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:18:04.030","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-91771","references":[{"url":"https://github.com/wandb/wandb","label":"disclosure@vulncheck.com"},{"url":"https://github.com/wandb/wandb/blob/v0.27.2/wandb/apis/public/files.py#L319-L347","label":"disclosure@vulncheck.com"},{"url":"https://github.com/wandb/wandb/commit/e52558f3a6a94ea816af74969a13a35e5904cad6","label":"disclosure@vulncheck.com"},{"url":"https://github.com/wandb/wandb/issues/12592","label":"disclosure@vulncheck.com"},{"url":"https://github.com/wandb/wandb/releases/tag/v0.29.0","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/weights-biases-wandb-before-0.29.0-path-traversal-via-file-download","label":"disclosure@vulncheck.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91771.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-91771"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2533555"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-91771"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91771"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00731,"epssPercentile":0.52386,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-18T17:14:53.033262Z"},"ingestedAt":"2026-09-15T02:19:07.441Z","slug":"CVE-2026-91771","body":"## Overview\n\nWeights & Biases wandb before 0.29.0 fails to validate the file name from server responses in the File.download function, allowing path traversal attacks. Attackers controlling the backend can supply file names with directory traversal sequences to write files outside the intended download directory, potentially enabling code execution through modification of shell startup files or Python import paths.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Exploit Intelligence, Red Hat AI Inference Server · no fix planned: Exploit Intelligence, Red Hat AI Inference Server · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91771.json)","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}