Security Advisory

CVE-2026-49991

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-06-26 20:01:29

Last updated 2026-06-29 13:15:10

Assigner GitHub_M

CVSS score 8.6

State PUBLISHED

Description

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.

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