Vulnerability-Lookup

CVE-2026-73080 (GCVE-0-2026-73080)

Vulnerability from cvelistv5 – Published: 2026-08-11 15:57 – Updated: 2026-08-13 14:53

Title

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

Summary

SeaweedFS is a distributed storage system. Prior to 4.24, VolumeServer.FetchAndWriteNeedle in weed/server/volume_grpc_remote.go fetches a caller-supplied remote endpoint through weed/remote_storage/s3/s3_storage_client.go and writes the response into a needle. The RPC performs no authentication and no target validation, allowing anyone who can reach a volume server's gRPC port to cause requests to arbitrary hosts, including loopback, link-local, RFC 1918, and cloud metadata endpoints such as 169.254.169.254, and read the response. On cloud deployments, this can disclose instance metadata and IAM credentials and reach otherwise unexposed internal services. The volume server gRPC plane is unauthenticated by default, and configuring documented JWT signing keys does not protect this RPC. This issue is fixed in version 4.24.

Severity

9.3 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-13 14:53 UTC

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M

References

4 references

URL	Tags
https://github.com/seaweedfs/seaweedfs/security/a…	x_refsource_CONFIRM
https://github.com/seaweedfs/seaweedfs/pull/9441	x_refsource_MISC
https://github.com/seaweedfs/seaweedfs/commit/69d…	x_refsource_MISC
https://github.com/seaweedfs/seaweedfs/releases/t…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
seaweedfs	seaweedfs	Affected: < 4.24

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JSON

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GHSA-87FV-VQQR-M4JR

Vulnerability from github – Published: 2026-08-11 15:58 – Updated: 2026-08-11 15:58

Summary

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

Details

Impact

VolumeServer.FetchAndWriteNeedle fetches a caller-supplied remote endpoint and writes the response into a needle. Before 4.24 this RPC performed no authentication and no validation of the target, so anyone able to reach a volume server's gRPC port could coerce the server into issuing requests to arbitrary hosts — including loopback, link-local, RFC 1918, and cloud metadata endpoints such as 169.254.169.254 — and read the response back. On cloud deployments this discloses instance metadata and IAM credentials, and can be used to reach otherwise-unexposed internal services (SSRF with response read-back).

The volume server gRPC plane is unauthenticated on a default deployment, so no credentials are required. Configuring the documented JWT signing keys does not close it, because that hardening does not apply to this RPC.

Affected component

weed/server/volume_grpc_remote.go (FetchAndWriteNeedle)
weed/remote_storage/s3/s3_storage_client.go

Patches

Fixed in 4.24. FetchAndWriteNeedle now requires admin authorization and refuses loopback / link-local / RFC 1918 / IMDS destinations through a guarded dialer that resolves the host itself and pins the resolved address for the duration of the request, defeating DNS-rebinding. The Rust volume server carries the equivalent endpoint validation.

Workarounds

Restrict volume server gRPC ports to trusted hosts via firewall / network policy, and enable mTLS via security.toml.

Severity

9.3 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/seaweedfs/seaweedfs"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.0-20260512171120-69da20bdaec9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-73080"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-11T15:58:23Z",
    "nvd_published_at": null,
    "severity": "CRITICAL"
  },
  "details": "### Impact\n`VolumeServer.FetchAndWriteNeedle` fetches a caller-supplied remote endpoint and writes the response into a needle. Before 4.24 this RPC performed no authentication and no validation of the target, so anyone able to reach a volume server\u0027s gRPC port could coerce the server into issuing requests to arbitrary hosts \u2014 including loopback, link-local, RFC 1918, and cloud metadata endpoints such as `169.254.169.254` \u2014 and read the response back. On cloud deployments this discloses instance metadata and IAM credentials, and can be used to reach otherwise-unexposed internal services (SSRF with response read-back).\n\nThe volume server gRPC plane is unauthenticated on a default deployment, so no credentials are required. Configuring the documented JWT signing keys does not close it, because that hardening does not apply to this RPC.\n\n### Affected component\n- `weed/server/volume_grpc_remote.go` (`FetchAndWriteNeedle`)\n- `weed/remote_storage/s3/s3_storage_client.go`\n\n### Patches\nFixed in **4.24**. `FetchAndWriteNeedle` now requires admin authorization and refuses loopback / link-local / RFC 1918 / IMDS destinations through a guarded dialer that resolves the host itself and pins the resolved address for the duration of the request, defeating DNS-rebinding. The Rust volume server carries the equivalent endpoint validation.\n\n### Workarounds\nRestrict volume server gRPC ports to trusted hosts via firewall / network policy, and enable mTLS via `security.toml`.",
  "id": "GHSA-87fv-vqqr-m4jr",
  "modified": "2026-08-11T15:58:23Z",
  "published": "2026-08-11T15:58:23Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-87fv-vqqr-m4jr"
    },
    {
      "type": "WEB",
      "url": "https://github.com/seaweedfs/seaweedfs/pull/9441"
    },
    {
      "type": "WEB",
      "url": "https://github.com/seaweedfs/seaweedfs/commit/69da20bdaec923e5a43d8aa71bf3c0a2051fc019"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/seaweedfs/seaweedfs"
    },
    {
      "type": "WEB",
      "url": "https://github.com/seaweedfs/seaweedfs/releases/tag/4.24"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "SeaweedFS: Unauthenticated SSRF with response read-back via VolumeServer.FetchAndWriteNeedle"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

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