How severe is CVE-2026-54917?

CVE-2026-54917 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-54917 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-54917?

CVE-2026-54917 affects Seaweedfs. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-54917?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-54917 have an EU (EUVD) identifier?

Yes. CVE-2026-54917 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39535.

When was CVE-2026-54917 published?

CVE-2026-54917 was published on 2026-06-25 and last updated on 2026-06-29.

CVE-2026-54917

CVE-2026-54917 is a critical-severity vulnerability in Seaweedfs with a CVSS 3.x base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Critical (CVSS 3.x base score 10.0)
CVSS v4: 7.8
EPSS exploit prediction: 0% (26th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39535
Weakness: CWE-22
Affected product: Seaweedfs
Published: 2026-06-25
Last modified: 2026-06-29

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.

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.
How severe is CVE-2026-54917?: CVE-2026-54917 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-54917 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-54917?: CVE-2026-54917 affects Seaweedfs. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-54917?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-54917 have an EU (EUVD) identifier?: Yes. CVE-2026-54917 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39535.
When was CVE-2026-54917 published?: CVE-2026-54917 was published on 2026-06-25 and last updated on 2026-06-29.

References

Affected products (1)

cpe:2.3:a:seaweedfs:seaweedfs:*:*:*:*:*:*:*:*

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