DNSSEC Cache Poisoning Vulnerability in Hickory DNS
CVE-2026-123598

6.3MEDIUM

Key Information:

Vendor

Hickory-dns

Status
Hickory-dns
Vendor
CVE Published:
8 November 2026

What is CVE-2026-123598?

A vulnerability exists in Hickory DNS where the validating recursor improperly caches DNSSEC-bogus answers. This flaw affects versions 0.25.0 to 0.26.0-alpha.1 of the hickory-recursor, as well as hickory-resolver and hickory-net versions prior to 0.26.2. Attackers can exploit this by spoofing an authoritative response with an invalid signature and a long TTL, allowing them to maintain control over misleading DNS information for up to 24 hours. This poses a significant risk as malicious actors can manipulate user traffic and disrupt normal operations.

Affected Version(s)

hickory-dns 0.25.0 <= 0.26.0-alpha.1

hickory-dns 0.26.0-alpha.1 < 0.26.2

hickory-dns 0.26.0-beta.1 < 0.26.2

References

https://github.com/hickory-dns/hickory-dns/security/advis...
vendor-advisory
https://www.vulncheck.com/advisories/hickory-dns-0.25.0-t...
third-party-advisory

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

qifan-sailboat
.