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

Quick assessment

Affected
rustfs rustfs
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

rustfs是RustFS组织开源的一个高性能对象存储系统。 RustFS 1.0.0-beta.4版本存在路径遍历漏洞，该漏洞源于Snowball自动提取功能中存在路径遍历问题，涉及tar条目键规范化中缺乏../清理、IAM通配符匹配使用原始路径以及文件系统路径清理跨存储桶边界解析../，可能导致已认证用户将任意对象写入其他用户的存储桶。

CVSS 8.6 · High EPSS 0.41% · P34

Affected Version Matrix 1

VendorProduct Version RangeStatus
rustfs rustfs 1.0.0-beta.4 affected
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I. Basic Information for CVE-2026-49991

Vulnerability Information
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Vulnerability Title
RustFS Snowball Auto-Extract: Path Traversal allows cross-bucket object injection
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
RustFS 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
rustfs是RustFS组织开源的一个高性能对象存储系统。 RustFS 1.0.0-beta.4版本存在路径遍历漏洞，该漏洞源于Snowball自动提取功能中存在路径遍历问题，涉及tar条目键规范化中缺乏../清理、IAM通配符匹配使用原始路径以及文件系统路径清理跨存储桶边界解析../，可能导致已认证用户将任意对象写入其他用户的存储桶。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
rustfs rustfs 1.0.0-beta.4 -

II. Public POCs for CVE-2026-49991

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9539 chars
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Exploit chain & mitigation
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III. Intelligence Information for CVE-2026-49991

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Vendor Advisories for CVE-2026-49991 (1)

Same Patch Batch · rustfs · 2026-06-26 · 4 CVEs total

CVE-2026-55188 8.2 HIGH RustFS: ListRemoteTargetHandler authorization bypass leaks replication target credentials
CVE-2026-55189 7.7 HIGH RustFS: FTP frontend skips IAM authorization on object reads
CVE-2026-55838 4.3 MEDIUM RustFS: Missing admin authorization on /rustfs/admin/v3/metrics allows any authenticated u

IV. Related Vulnerabilities

Same product: rustfs
Same vendor: rustfs
Same weakness: CWE-22

V. Comments for CVE-2026-49991

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