# CVE-2026-64861: Probo: GraphQL Alias-Based Application Layer Denial of Service (DoS)

Status: published. Published: 2026-11-11. Updated: 2026-11-11.

Probo is a self-hostable governance, risk, and compliance (GRC) platform built for engineering and security teams. Prior to version 0.222.0, the GraphQL endpoint does not enforce restrictions on alias count, query depth, or query complexity. An attacker can send a single request containing thousands of aliased resolver calls, causing excessive server-side resource consumption and service degradation. This issue has been patched in version 0.222.0.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- getprobo / probo: < 0.222.0 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 4.3 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-770

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/getprobo/probo/security/advisories/GHSA-prh2-g8pv-m7p9 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/getprobo/probo/pull/1424 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/getprobo/probo/commit/bf255b198cb6c9f44cd183c49743c9ffdaa44ce7 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/getprobo/probo/releases/tag/probod%2Fv0.222.0 (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-64861; retrieved 2026-11-11; source updated 2026-11-11

Revision: d518bbc871df0266730d53eef7e9966a0dcb84c7e4eed29a014803121d6d5c34

Canonical: https://y2.dev/cve/CVE-2026-64861

## 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.