CVE-2026-49991

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Source

https://cve.org/CVERecord?id=CVE-2026-49991

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49991.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-49991

Aliases

GHSA-f4vq-9ffr-m8m3

Published

2026-06-26T20:01:29Z

Modified

2026-10-28T02:31:15Z

Severity

8.6 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N CVSS Calculator

Summary

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

Details

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.

Database specific

{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-22",
        "CWE-862"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49991.json"
}

References

Affected packages

Git / github.com/rustfs/rustfs

Affected ranges

Type

GIT

Repo

https://github.com/rustfs/rustfs

Events

Introduced

dcbffb084f9a85b7362f2c146e16f749d2c81179

Last Affected

dcbffb084f9a85b7362f2c146e16f749d2c81179

Database specific

Show details

{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "1.0.0-beta.4"
                },
                {
                    "last_affected":  "1.0.0-beta.4"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandaloneSingleVersion"
        }
    ]
}

Affected versions

1.*

1.0.0-beta.4

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49991.json"