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CVE-2026-55189: RustFS: FTP frontend skips IAM authorization on object reads

• Severity: high (CVSS 7.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% 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-862

Description

RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.1 until 1.0.0-beta.9, when the FTP frontend is enabled, the FTP read and probe handlers dispatch directly to the storage backend without ever calling the IAM authorization function that the FTP write/list handlers (and the entire HTTP S3 path) use. As a result, any user who can authenticate to the FTP listener — including a user whose IAM policy contains an explicit Deny on s3:GetObject — can read (RETR) and stat (SIZE/MDTM) any object in any bucket, and probe any bucket (CWD), completely regardless of their IAM policy. This vulnerability is fixed in 1.0.0-beta.9.

Affected products

• rustfs: from 1.0.0-alpha.1, <= 1.0.0-beta.8

References

• https://github.com/rustfs/rustfs/security/advisories/GHSA-3g29-xff2-92vp
• https://github.com/rustfs/rustfs/security/advisories/GHSA-3g29-xff2-92vp

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