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CVE-2026-54917

HighPublished

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

Published: Jun 25, 2026
Updated: Jun 25, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 5, 2026

Primary CVSS

7.8/ 10High

nvd · CVSS 4.0

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

1.2%

Low · next 30 days

Percentile: 66.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-54917-SeaweedFS-Cross-Bucket-TraversalPoC
PoC + analysis for CVE-2026-54917 — SeaweedFS S3 gateway cross-bucket path traversal (CVSS 10.0, <4.30). Read/write any bucket via .. in the object key.

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