CVE-2026-123607

CVSS 8.7 (high) · published 2026-11-08

Hickory DNS hickory-proto 0.25.0-alpha.3 through 0.25.2 and hickory-net before 0.26.1 contain an unbounded loop vulnerability in DnssecDnsHandle NSEC3 closest-encloser proof validation when the SOA owner is not an ancestor of the QNAME. Upstream attackers can return NoData or NXDomain responses with a cross-zone SOA record to panic debug builds or exhaust memory in release builds.

Weakness: CWE-835

Source: NVD CVE-2026-123607

References

• https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-3v94-mw7p-v465
• https://www.vulncheck.com/advisories/hickory-dns-nsec3-closest-encloser-proof-unbounded-loop-denial-of-service

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