{"id":"CVE-2026-49991","summary":"RustFS Snowball Auto-Extract: Path Traversal allows cross-bucket object injection","details":"RustFS is a distributed object storage system built in Rust. In 1.0.0-beta.4, authenticated users with only PutObject permission on their own bucket can exploit a path traversal vulnerability in the Snowball auto-extract feature to write arbitrary objects into other users' buckets, completely breaking multi-tenant isolation. The vulnerability chains three flaws: No ../ sanitization in tar entry key normalization; IAM wildcard matching uses raw (uncleaned) paths; and Filesystem path cleaning resolves ../ across bucket boundaries.","aliases":["GHSA-f4vq-9ffr-m8m3"],"modified":"2026-07-15T01:49:07.886687246Z","published":"2026-06-26T20:01:29.896Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-22","CWE-862"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49991.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49991.json"},{"type":"ADVISORY","url":"https://github.com/rustfs/rustfs/security/advisories/GHSA-f4vq-9ffr-m8m3"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49991"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/rustfs/rustfs","events":[{"introduced":"dcbffb084f9a85b7362f2c146e16f749d2c81179"},{"last_affected":"dcbffb084f9a85b7362f2c146e16f749d2c81179"}],"database_specific":{"extracted_events":[{"introduced":"1.0.0-beta.4"},{"last_affected":"1.0.0-beta.4"}],"source":"AFFECTED_FIELD"}}],"versions":["1.0.0-beta.4"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49991.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N"}]}