# CVE-2026-54442: NationalSecurityAgency/emissary: Incomplete fix for CVE-2026-35571: SSRF

Status: published. Published: 2026-11-05. Updated: 2026-11-05.

Emissary is a P2P based data-driven workflow engine. Prior to 8.51.0, the VALID_LINK validation in src/main/java/emissary/server/mvc/NavAction.java accepts protocol-relative URLs when processing configured navigation links. Browser URL normalization can interpret these accepted strings as external origins. The authoritative advisory attributes open redirect, server-side request forgery, and cloud metadata access to this bypass, but it identifies neither the server-side dereference path nor how navigation-link processing reaches that path. This issue is fixed in version 8.51.0.

## Remediation

- fix: gov.nsa.emissary:emissary (Maven): OSV reports a fixed version 8.51.0. Check the advisory for supported release branches. (source: OSV GHSA-c6q7-wqw2-h65w) — https://github.com/advisories/GHSA-c6q7-wqw2-h65w

## Affected products and versions

- NationalSecurityAgency / emissary: < 8.51.0 (affected). Source: CNA: GitHub_M
-  / gov.nsa.emissary:emissary (gov.nsa.emissary:emissary): 8.0.0 (affected, Maven); 8.1.0 (affected, Maven); 8.10.0 (affected, Maven); 8.11.0 (affected, Maven); 8.11.1 (affected, Maven); 8.12.0 (affected, Maven); 8.13.0 (affected, Maven); 8.14.0 (affected, Maven); 8.15.0 (affected, Maven); 8.16.0 (affected, Maven); 8.17.0 (affected, Maven); 8.18.0 (affected, Maven); 8.19.0 (affected, Maven); 8.19.1 (affected, Maven); 8.2.0 (affected, Maven); 8.20.0 (affected, Maven); 8.21.0 (affected, Maven); 8.22.0 (affected, Maven); 8.23.0 (affected, Maven); 8.24.0 (affected, Maven); 8.25.0 (affected, Maven); 8.26.0 (affected, Maven); 8.27.0 (affected, Maven); 8.28.0 (affected, Maven); 8.29.0 (affected, Maven); 8.3.0 (affected, Maven); 8.30.0 (affected, Maven); 8.31.0 (affected, Maven); 8.32.0 (affected, Maven); 8.33.0 (affected, Maven); 8.34.0 (affected, Maven); 8.35.0 (affected, Maven); 8.36.0 (affected, Maven); 8.37.0 (affected, Maven); 8.38.0 (affected, Maven); 8.39.0 (affected, Maven); 8.4.0 (affected, Maven); 8.40.0 (affected, Maven); 8.41.0 (affected, Maven); 8.42.0 (affected, Maven); 8.43.0 (affected, Maven); 8.44.0 (affected, Maven); 8.45.0 (affected, Maven); 8.46.0 (affected, Maven); 8.47.0 (affected, Maven); 8.48.0 (affected, Maven); 8.49.0 (affected, Maven); 8.5.0 (affected, Maven); 8.50.0 (affected, Maven); 8.6.0 (affected, Maven); 8.7.0 (affected, Maven); 8.7.1 (affected, Maven); 8.8.0 (affected, Maven); 8.9.0 (affected, Maven); Ecosystem version events: introduced 0; fixed 8.51.0. Source: OSV GHSA-c6q7-wqw2-h65w

## Severity and prioritization

- CVSS 3.1: 4.8 (medium); CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

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

- Weaknesses: CWE-918

## Exploit evidence

- exploit: https://github.com/NationalSecurityAgency/emissary/security/advisories/GHSA-c6q7-wqw2-h65w (ADP: CISA-ADP)

## References

- https://github.com/NationalSecurityAgency/emissary/security/advisories/GHSA-c6q7-wqw2-h65w (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/NationalSecurityAgency/emissary/commit/e0179f7558cfb09a5bbc63a2f9fcb50f899768f6 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/NationalSecurityAgency/emissary/releases/tag/8.51.0 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/NationalSecurityAgency/emissary/security/advisories/GHSA-c6q7-wqw2-h65w (ADP: CISA-ADP; exploit)

- https://github.com/advisories/GHSA-c6q7-wqw2-h65w (OSV / GitHub Security Advisories; advisory)

- https://osv.dev/vulnerability/GHSA-c6q7-wqw2-h65w (OSV / GitHub Security Advisories; osv)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-54442; retrieved 2026-11-05; source updated 2026-11-05

- OSV / GitHub Security Advisories: https://osv.dev/vulnerability/GHSA-c6q7-wqw2-h65w; retrieved 2026-11-05; source updated 2026-11-04

Revision: 777cf79904bb537c0d936415f3e50ce5ae8f6a3bf9ee1894e41b27236557e359

Canonical: https://y2.dev/cve/CVE-2026-54442

## 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.