CVE-2026-54917

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.

CVSS v3.1 Score

10.0

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

EPSS — Exploit Prediction

0.0035

Probability of exploitation

0.26%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-22 Path Traversal

Affected Products

Vendor	Product	Versions
seaweedfs	seaweedfs	< 4.30

References

Advisories & Patches

https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-w62w-66v9-vvgv https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-w62w-66v9-vvgv

Exploits

https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-w62w-66v9-vvgv https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-w62w-66v9-vvgv

Other References

https://github.com/seaweedfs/seaweedfs/pull/9687

Frequently Asked Questions

What is CVE-2026-54917? +

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. It has a CVSS v3.1 base score of 10.0 (CRITICAL).

How severe is CVE-2026-54917? +

CVE-2026-54917 has a CVSS v3.1 score of 10.0 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0035, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-54917? +

CVE-2026-54917 affects products from seaweedfs, specifically: seaweedfs. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-54917? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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