GHSA-HGPF-8634-G44C
Vulnerability from github – Published: 2026-08-28 22:16 – Updated: 2026-08-28 22:16Summary
SeaweedFS routes requests signed with SigV4 service s3tables to the S3Tables
management API. Authorization on that path collapsed account-less S3 identities
into the shared admin account and failed open, so a user holding only ordinary
S3 Read credentials — and no S3Tables-specific permission — could invoke
S3Tables management operations such as GET /buckets and enumerate
administrator-owned table bucket inventory (names and ARNs). The same handler
backs the Iceberg REST catalog, which was affected by the same flaw.
Impact
An authenticated low-privileged S3 user can cross the boundary between ordinary S3 object access and S3Tables management. Confirmed impact is disclosure of administrator-owned table bucket inventory (bucket names and ARNs); in shared or multi-tenant deployments this can reveal tenant naming and operational structure.
Affected versions
SeaweedFS >= 4.08, < 4.34 (the S3Tables management API was introduced in 4.08).
Patched versions
Fixed in 4.34 (#9961). Administrator status is now decided by the
ACTION_ADMIN capability rather than by a collapsed admin account id, S3Tables
authorization no longer defaults to allow, and the tautological ListTableBuckets
gate was removed. Related hardening of the same root cause landed in #9962,
9963, and #9971.
Workaround
No configuration workaround — upgrade to 4.34 or later.
Credit
Reported by TA-MU-TA.
{
"affected": [
{
"package": {
"ecosystem": "Go",
"name": "github.com/seaweedfs/seaweedfs"
},
"ranges": [
{
"events": [
{
"introduced": "0.0.0-20260128085517-09bb90e8dc16"
},
{
"fixed": "0.0.0-20260614205536-b13463880c1f"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-55873"
],
"database_specific": {
"cwe_ids": [
"CWE-863"
],
"github_reviewed": true,
"github_reviewed_at": "2026-08-28T22:16:43Z",
"nvd_published_at": "2026-07-08T15:16:30Z",
"severity": "MODERATE"
},
"details": "### Summary\nSeaweedFS routes requests signed with SigV4 service `s3tables` to the S3Tables\nmanagement API. Authorization on that path collapsed account-less S3 identities\ninto the shared `admin` account and failed open, so a user holding only ordinary\nS3 `Read` credentials \u2014 and no S3Tables-specific permission \u2014 could invoke\nS3Tables management operations such as `GET /buckets` and enumerate\nadministrator-owned table bucket inventory (names and ARNs). The same handler\nbacks the Iceberg REST catalog, which was affected by the same flaw.\n\n### Impact\nAn authenticated low-privileged S3 user can cross the boundary between ordinary\nS3 object access and S3Tables management. Confirmed impact is disclosure of\nadministrator-owned table bucket inventory (bucket names and ARNs); in shared or\nmulti-tenant deployments this can reveal tenant naming and operational structure.\n\n### Affected versions\nSeaweedFS `\u003e= 4.08, \u003c 4.34` (the S3Tables management API was introduced in 4.08).\n\n### Patched versions\nFixed in **4.34** (#9961). Administrator status is now decided by the\n`ACTION_ADMIN` capability rather than by a collapsed `admin` account id, S3Tables\nauthorization no longer defaults to allow, and the tautological ListTableBuckets\ngate was removed. Related hardening of the same root cause landed in #9962,\n#9963, and #9971.\n\n### Workaround\nNo configuration workaround \u2014 upgrade to 4.34 or later.\n\n### Credit\nReported by **TA-MU-TA**.",
"id": "GHSA-hgpf-8634-g44c",
"modified": "2026-08-28T22:16:43Z",
"published": "2026-08-28T22:16:43Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-hgpf-8634-g44c"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55873"
},
{
"type": "WEB",
"url": "https://github.com/seaweedfs/seaweedfs/pull/9961"
},
{
"type": "WEB",
"url": "https://github.com/seaweedfs/seaweedfs/commit/b13463880c1fa62e255c058a9228b63cc95b4b36"
},
{
"type": "PACKAGE",
"url": "https://github.com/seaweedfs/seaweedfs"
},
{
"type": "WEB",
"url": "https://github.com/seaweedfs/seaweedfs/releases/tag/4.34"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
}
],
"summary": "SeaweedFS: Improper authorization in the S3Tables / Iceberg REST management API lets a low-privileged S3 user enumerate administrator-owned table buckets"
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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