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CVE-2026-54917— SeaweedFS: Path traversal in the S3 and Iceberg REST gateways allows cross-bucket access

Quick assessment

Affected
seaweedfs seaweedfs
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.

SeaweedFS是SeaweedFS团队开源的一个用于blob、对象、文件和数据湖的快速分布式存储系统。 SeaweedFS 4.30之前版本存在路径遍历漏洞，该漏洞源于S3 API网关和Iceberg REST目录网关在构建路由器时禁用路径清理，导致URL中的..段保留，从而可能使攻击者通过特制请求访问其他存储桶。

AI Predicted 7.5 Difficulty: Easy EPSS 1.64% · P76

Public Exploits 1

Nuclei · 1 CVE-2026-54917.yaml [template]

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 1

VendorProduct Version RangeStatus
seaweedfs seaweedfs < 4.30 affected
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I. Basic Information for CVE-2026-54917

Vulnerability Information
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Vulnerability Title
SeaweedFS: Path traversal in the S3 and Iceberg REST gateways allows cross-bucket access
Source: CVE Program / CVE List V5
Vulnerability Description
SeaweedFS is a distributed storage system for object storage (S3), file systems, and Iceberg tables. Prior to 4.30, the S3 API gateway and the Iceberg REST catalog gateway construct their routers with mux.NewRouter().SkipClean(true). With path cleaning disabled, a .. segment inside the URL survives routing, so a request such as `GET /bucket-A/../evil-bucket/key`, is matched as bucket=bucket-A, object=../evil-bucket/key. The captured object key is then joined into a filer path with util.JoinPath (S3) / path.Join (Iceberg), which collapse the .. server-side, so the actual read or write lands in evil-bucket. This vulnerability is fixed in 4.30.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA: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
SeaweedFS 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SeaweedFS是SeaweedFS团队开源的一个用于blob、对象、文件和数据湖的快速分布式存储系统。 SeaweedFS 4.30之前版本存在路径遍历漏洞，该漏洞源于S3 API网关和Iceberg REST目录网关在构建路由器时禁用路径清理，导致URL中的..段保留，从而可能使攻击者通过特制请求访问其他存储桶。
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
seaweedfs seaweedfs < 4.30 -

II. Public POCs for CVE-2026-54917

# POC Description Source Link Shenlong Link
1 SeaweedFS versions through 4.29 build the S3 API and Iceberg REST catalog routers with mux.NewRouter().SkipClean(true), which disables URL path cleaning. A `..` segment in the request path therefore survives routing and reaches the handlers unnormalised, so a request such as `PUT /bucket-A/../evil-bucket/key` is matched as bucket=bucket-A with object=../evil-bucket/key. The captured object key is then joined into a filer path where the `..` is collapsed server-side, so the write lands in evil-bucket while authorisation is evaluated against bucket-A, enabling cross-bucket file write. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-54917.yaml POC Details
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III. Intelligence Information for CVE-2026-54917

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Patches & Fixes for CVE-2026-54917 (1)

Vendor Advisories for CVE-2026-54917 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-54917

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