CVE-2026-49991 — RustFS Snowball Auto-Extract: Path Traversal allows cross-bucket object injection
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…
Published: 2026-06-26 · CVSS: 8.6 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7