Vulnerability Description
The recursive resolver in Hickory DNS (all versions of the hickory-recursor crate, and hickory-resolver 0.26.0 before 0.26.2) caches an empty connection pool when it follows a referral with no glue records and all queries for the name servers' IP addresses fail. An attacker able to spoof DNS responses can make these lookups fail, causing all subsequent queries for the affected zone to fail until the cache entry expires or is evicted.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-9px7-7m25-f6
- https://www.vulncheck.com/advisories/hickory-dns-recursive-resolver-denial-of-se
FAQ
What is CVE-2026-123588?
CVE-2026-123588 is a vulnerability with a CVSS score of 7.5 (HIGH). The recursive resolver in Hickory DNS (all versions of the hickory-recursor crate, and hickory-resolver 0.26.0 before 0.26.2) caches an empty connection pool when it follows a referral with no glue re...
How severe is CVE-2026-123588?
CVE-2026-123588 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-123588?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.