CVE-2026-123591

CVSS 8.2 (high) · published 2026-11-08

Hickory DNS hickory-net 0.26.0-beta.1 before 0.26.2 and hickory-proto through 0.26.0-alpha.1 fail to verify, per RFC 6840 §4.4, that an NSEC or NSEC3 record denying a DS RRset also proves the delegation's NS record exists. Attackers can reuse child-side NSEC or NSEC3 records to fake an insecure delegation and forge child-zone records.

Weakness: CWE-345

Source: NVD CVE-2026-123591

References

• https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-7php-9j59-g3ch
• https://www.vulncheck.com/advisories/hickory-dns-0.26.0-beta.1-before-0.26.2-dnssec-validation-bypass-via-missing-rfc-6840-checks

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