# NationalSecurityAgency/emissary has an incomplete fix for CVE-2026-35571

Advisory record · `GHSA-c6q7-wqw2-h65w`

- **Identifiers:** `GHSA-c6q7-wqw2-h65w` · `CVE-2026-54442`
- **State:** Confirmed
- **Severity:** CVSS 4.8 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-918](https://cwe.mitre.org/data/definitions/918.html)
- **Tags:** [Server-side request forgery (SSRF)](https://agentprime.io/advisories/tag/ssrf.md)
- **Published:** 30 Oct 2026
- **Updated:** 4 Nov 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 30 Oct 2026, 22:51 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `gov.nsa.emissary:emissary` (Maven): affected `<8.51.0`; fixed in `8.51.0`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> emissary versions before 8.51.0 contain an incomplete fix for CVE-2026-35571. Its URL validation for navigation links can be bypassed with protocol-relative or single-slash URLs, which can let an attacker redirect users to external sites or make the server send requests to internal services. Upgrade to emissary 8.51.0 or later.

Written 2 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 4.8 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** No score.

## Timeline

- 30 Oct 2026, 22:51 UTC: [Confirmed by GitHub Advisory Database](https://github.com/advisories/GHSA-c6q7-wqw2-h65w)
- 31 Oct 2026, 14:16 UTC: First seen by agentprime
- 31 Oct 2026, 14:16 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-c6q7-wqw2-h65w)
- 5 Nov 2026, 20:30 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-54442)
- 5 Nov 2026, 21:18 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-54442)

## Sources

- [GitHub Advisory Database: GHSA-c6q7-wqw2-h65w](https://github.com/advisories/GHSA-c6q7-wqw2-h65w)
- [OSV: GHSA-c6q7-wqw2-h65w](https://osv.dev/vulnerability/GHSA-c6q7-wqw2-h65w)
- <https://github.com/NationalSecurityAgency/emissary/security/advisories/GHSA-c6q7-wqw2-h65w>
- <https://github.com/NationalSecurityAgency/emissary/security/advisories/GHSA-cpm7-cfpx-3hvp>
- <https://github.com/NationalSecurityAgency/emissary/commit/e0179f7558cfb09a5bbc63a2f9fcb50f899768f6>
- <https://github.com/NationalSecurityAgency/emissary/commit/e2078417464b9004620dde28dcbca2f73ea06c13>
- <https://github.com/NationalSecurityAgency/emissary>
- <https://github.com/NationalSecurityAgency/emissary/releases/tag/8.39.0>
- <https://github.com/NationalSecurityAgency/emissary/releases/tag/8.51.0>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-c6q7-wqw2-h65w>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-c6q7-wqw2-h65w/>. Everything for agents: <https://agentprime.io/llms.txt>.