# CVE-2026-126659: BlueprintUE Self-Hosted Edition 1.0.0 before 4.3.5 Storage Exhaustion via Anonymous Blueprints

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

BlueprintUE Self-Hosted Edition 1.0.0 before 4.3.5 contains a resource exhaustion vulnerability that allows unauthenticated attackers to fill server storage by repeatedly creating anonymous blueprints. Attackers can send large requests to HomeController::doProcessCreateBlueprint() with a 'never' expiration, bypassing purges to fill the disk and deny service.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/blueprintue/blueprintue-self-hosted-edition/commit/0709b39851bf58febccf0bc74b88fa86070410de
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/blueprintue/blueprintue-self-hosted-edition/pull/268

## Affected products and versions

- blueprintue / blueprintue-self-hosted-edition (blueprintue/blueprintue-self-hosted-edition): ≥ 1.0.0; < 4.3.5 (affected, semver); 4.3.5 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 8.7 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: VulnCheck

- 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/blueprintue/blueprintue-self-hosted-edition/security/advisories/GHSA-q2vm-p36g-w596 (CNA: VulnCheck; vendor-advisory)

- https://github.com/blueprintue/blueprintue-self-hosted-edition/commit/0709b39851bf58febccf0bc74b88fa86070410de (CNA: VulnCheck; patch)

- https://github.com/blueprintue/blueprintue-self-hosted-edition/pull/268 (CNA: VulnCheck; patch, issue-tracking)

- https://github.com/blueprintue/blueprintue-self-hosted-edition/releases/tag/v4.3.5 (CNA: VulnCheck; release-notes)

- https://github.com/blueprintue/blueprintue-self-hosted-edition/blob/v4.3.4/app/controllers/www/HomeController.php#L151-L214 (CNA: VulnCheck; technical-description)

- https://www.vulncheck.com/advisories/blueprintue-self-hosted-edition-1.0.0-before-4.3.5-storage-exhaustion-via-anonymous-blueprints (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-126659; retrieved 2026-11-11; source updated 2026-11-11

Revision: 680de768776d6ef8af1655883bc9d4df41797b16cb0cfda3a5dd357f8ed9cd92

Canonical: https://y2.dev/cve/CVE-2026-126659

## Agent and API access

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- 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.

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