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
2026-06-26T20:01:29.896Z
Modified
2026-07-15T01:49:07.886687246Z
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 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "1.0.0-beta.4"
        },
        {
            "last_affected": "1.0.0-beta.4"
        }
    ]
}

Affected versions

1.*
1.0.0-beta.4

Database specific

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