Vulnerability · Published Jun 25, 2026 · Assigned by GitHub_M

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

High 7.8

In plain English

A high-severity path traversal in seaweedfs from seaweedfs. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.6% (higher than 76% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei, public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)7.8High

Exploit odds (30 days)1.6%top 23.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack tooling2Nuclei, Public PoC

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/seaweedfs/seaweedfs	0.0.0-20260526080459-dd1b4287899e	GHSA-w62w-66v9-vvgv
Go	github.com/seaweedfs/seaweedfs	0.0.0-20260526080459-dd1b4287899e	GO-2026-6221

Affected products (as reported)

Vendor	Product	Versions
seaweedfs	seaweedfs	< 4.30

Weakness: CWE-22 · Vector: 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

References

https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-w62w-66v9-vvgv x_refsource_CONFIRM
https://github.com/seaweedfs/seaweedfs/pull/9687 x_refsource_MISC