# SeaweedFS: Unauthenticated SSRF with response read-back via VolumeServer.FetchAndWriteNeedle

Advisory record · `GHSA-87fv-vqqr-m4jr`

- **Identifiers:** `GHSA-87fv-vqqr-m4jr` · `BIT-seaweedfs-2026-73080` · `CVE-2026-73080` · `GO-2026-6219`
- **State:** Confirmed
- **Severity:** CVSS 9.3 Critical
- **Critical:** Yes: CVSS 9+
- **Weakness (CWE):** [CWE-918](https://cwe.mitre.org/data/definitions/918.html)
- **Tags:** [Server-side request forgery (SSRF)](https://agentprime.io/advisories/tag/ssrf.md)
- **Published:** 11 Aug 2026
- **Updated:** 18 Aug 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 11 Aug 2026, 15:58 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 9.3: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `github.com/seaweedfs/seaweedfs` (Go): affected `<0.0.0-20260512171120-69da20bdaec9`; fixed in `0.0.0-20260512171120-69da20bdaec9`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> GHSA-87fv-vqqr-m4jr affects the Go package github.com/seaweedfs/seaweedfs before 0.0.0-20260512171120-69da20bdaec9, with the fix in that same version. The VolumeServer.FetchAndWriteNeedle gRPC call had no authentication or target validation, so an attacker who can reach a volume server's gRPC port can make it fetch arbitrary internal or cloud metadata addresses and read the responses back, potentially exposing IAM credentials. Upgrade to 0.0.0-20260512171120-69da20bdaec9 or later, or restrict volume server gRPC ports to trusted hosts and enable mTLS.

Written 6 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 9.3 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0053, the 45th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:50 UTC: First seen by agentprime
- 31 Oct 2026, 14:50 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-87fv-vqqr-m4jr)

## Sources

- [GitHub Advisory Database: GHSA-87fv-vqqr-m4jr](https://github.com/advisories/GHSA-87fv-vqqr-m4jr)
- [OSV: GHSA-87fv-vqqr-m4jr](https://osv.dev/vulnerability/GHSA-87fv-vqqr-m4jr)
- <https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-87fv-vqqr-m4jr>
- <https://github.com/seaweedfs/seaweedfs/pull/9441>
- <https://github.com/seaweedfs/seaweedfs/commit/69da20bdaec923e5a43d8aa71bf3c0a2051fc019>
- <https://github.com/seaweedfs/seaweedfs>
- <https://github.com/seaweedfs/seaweedfs/releases/tag/4.24>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-87fv-vqqr-m4jr>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-87fv-vqqr-m4jr/>. Everything for agents: <https://agentprime.io/llms.txt>.