CVE-2026-123597

CVSS 6.3 (medium) · published 2026-11-08

Hickory DNS hickory-proto 0.25.0-alpha.1 through 0.26.0-alpha.1 and hickory-net before 0.26.2 contain a logic bug in DnssecDnsHandle's DS-fetch path that caches transient DS lookup errors as Bogus DNSSEC validation verdicts. An attacker who induces a SERVFAIL, REFUSED, or timeout response to a child-zone DS sub-query causes the validator to return SERVFAIL for all names under that zone until the cache entry's TTL expires.

Weakness: CWE-613

Source: NVD CVE-2026-123597

References

• https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-xv7c-h5g9-x25x
• https://www.vulncheck.com/advisories/hickory-dns-dnssec-validation-cache-poisoning-via-transient-ds-fetch-errors

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