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Vulnerability record · CVE-2026-49991 · published 26 June 2026

CVE-2026-49991: Path traversal vulnerability

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.

8.6 CVSS 3.1 High EPSS 0.42% · top 66.7% CWE-22 · Path traversalCWE-862 · Missing authorization Deferred
8.6CVSS 3.1 base score
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
29 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-49991), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.