# CVE-2026-62300: Filecoin Pin: Unbounded DAG pinning can exhaust filecoin-pin server resources

Status: published. Published: 2026-10-30. Updated: 2026-11-02.

Filecoin Pin is an IPFS Pinning Service API implementation that pins to Filecoin's PDP service. In daemon deployments up to and including version 1.1.0, `POST /pins` in `src/filecoin-pinning-server.ts` checks a caller-supplied CID with `CID.parse` and passes it to `pinStore.pin`, but does not enforce request rate limits or per-user quotas. In `src/filecoin-pin-store.ts`, each pin independently schedules `_processPinInBackground` with `setTimeout` without a queue, semaphore or concurrency cap, then recursively traverses the full DAG using `helia.pins.add(cid)`. The per-pin Helia/Bitswap node in `src/create-pinning-helia.ts` has no application-level byte, block or traversal-time limits. Blocks are written under `carStoragePath` by `src/core/car/car-blockstore-base.ts` and `src/core/car/car-file-backend.ts`, with `stats.totalSize` updated only after writing. An authenticated caller, or an anonymous caller when `ALLOW_NO_AUTH=true`, can submit large DAGs and exhaust disk, network, CPU, memory and libp2p resources, causing service degradation or host/process failure and leaving partial CAR files requiring recovery. The default localhost binding and token requirement reduce exposure. Because nodes have no bootstrap or mDNS configuration, a CID alone may not be fetchable, but caller-supplied `origins` can point to a reachable attacker-controlled libp2p source; concurrent requests accelerate resource pressure. Version 1.1.1 documents operational mitigations but does not implement the missing resource controls.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- filecoin-project / filecoin-pin: <= 1.1.0 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H; source: CNA: GitHub_M

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H; source: NVD: security-advisories@github.com

- CISA KEV: No listing in collected sources

- EPSS: 0.25% as of 2026-11-02; percentile 16.23%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-400

## Exploit evidence

- exploit: https://github.com/filecoin-project/filecoin-pin/security/advisories/GHSA-m5ph-mmg5-6w5h (ADP: CISA-ADP)

## References

- https://github.com/filecoin-project/filecoin-pin/security/advisories/GHSA-m5ph-mmg5-6w5h (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/filecoin-project/filecoin-pin/commit/8db22b47899deb78dadf415fc477cae4bd6e82c2 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/filecoin-project/filecoin-pin/security/advisories/GHSA-m5ph-mmg5-6w5h (ADP: CISA-ADP; exploit)

- https://github.com/filecoin-project/filecoin-pin/commit/8db22b47899deb78dadf415fc477cae4bd6e82c2 (security-advisories@github.com)

- https://github.com/filecoin-project/filecoin-pin/security/advisories/GHSA-m5ph-mmg5-6w5h (security-advisories@github.com)

- https://github.com/filecoin-project/filecoin-pin/security/advisories/GHSA-m5ph-mmg5-6w5h (134c704f-9b21-4f2e-91b3-4a467353bcc0)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-62300; retrieved 2026-11-02; source updated 2026-11-02

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-62300; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-62300; retrieved 2026-11-02; source updated Not reported

Revision: a3ae2c39c936b2b8ee70dd73e5b2dab1ce1ed88623a9941a8b4b1e2bf7937a7c

Canonical: https://y2.dev/cve/CVE-2026-62300

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.