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CVE-2026-49991: RustFS Snowball Auto-Extract: Path Traversal allows cross-bucket object injection

• Severity: high (CVSS 8.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-26 · updated 2026-06-29
• Weakness: CWE-22

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.

Affected products

• rustfs: 1.0.0-beta.4

References

• https://github.com/rustfs/rustfs/security/advisories/GHSA-f4vq-9ffr-m8m3
• https://github.com/rustfs/rustfs/security/advisories/GHSA-f4vq-9ffr-m8m3

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