CVE-2026-54917
A public proof of concept exists; no exploitation attested.
- Published2026-06-25
- Fixed in4.30
- WeaknessCWE-22
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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.
Timeline
dates in UTC- 2026-06-2519:16CVE publishedNVD
- 2026-10-2319:23First public proof of conceptPoC-in-GitHub
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-54917?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-54917?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 4.30 | < 4.30 | 4.30 | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Seaweedfs to 4.30
Advisories and patches
- github.comMitigation
- github.comPatch · Vendor Advisory
Detection
read 2026-10-23 19:25 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- 1 repository, unverifiedBiiTts/CVE-2026-54917-SeaweedFS-Cross-Bucket-Traversal PoC-in-GitHub
Sources
- CISA-ADPSSVC decisionpoc2026-06-25
- OpenCVESSVC decisionpoc—
- CNACVSS 4.07.8read 2026-10-23
- NVDCVSS 3.110read 2026-10-23
- CNAweakness (CWE)CWE-22read 2026-10-23
- FIRST EPSSEPSS score1.6 %2026-10-22
- PoC-in-GitHubproof of concept1read 2026-10-23
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
- CVSS 4.0 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/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
- Published
- 2026-06-25
- Last Modified
- 2026-06-29
- NVD status
- Analyzed
Frequently asked questions
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What is the CVSS score for CVE-2026-54917?
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Related vulnerabilities
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