by Kastro
Paper/Archive/CVE-2026-54917

CVE-2026-54917

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

EPSS 2%public exploitCVSS 10.0
critical.is priorityof 100
55
CVSS 10.0 (NVD)10.0 / 10 × 3030.0Not in CISA KEV+300.0EPSS percentile 76.4.764 × 2015.3Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
seaweedfs< 4.30–CNA

Scores by source

NVD10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
GitHub_M (CNA)7.8CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: partial

References

exploitgithub.com/seaweedfs/seaweedfs/security/advisories/GHSA-w62w-66v9-vvgvrefgithub.com/seaweedfs/seaweedfs/pull/9687