CVE-2026-123601
Published:November 08, 2026
Updated:November 09, 2026
Hickory DNS hickory-proto 0.25.0 through 0.26.0-alpha.1 and hickory-net 0.26.0-beta.1 before 0.26.2 invert the relational operators in the wrap-around branch of find_covering_record() in nsec3.rs, so the last NSEC3 record in a zone's hash ring covers every hash except its owner. Attackers able to inject DNS responses can replay that NSEC3 record and its RRSIG to forge DNSSEC-validated negative responses denying legitimate names.
Affected Packages
https://github.com/hickory-dns/hickory-dns.git (GITHUB):
Affected version(s) >=v0.25.0-alpha.3 <v0.26.2 || >=v0.26.0-alpha.1 <v0.26.2Fix Suggestion:
Update to version v0.26.2hickory-net (RUST):
Affected version(s) >=0.26.0-beta.1 <0.26.2Fix Suggestion:
Update to version 0.26.2hickory-proto (RUST):
Affected version(s) =0.26.0-alpha.1 <0.26.2 || >=0.25.0-alpha.3 <0.26.2Fix Suggestion:
Update to version 0.26.2Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
HIGH
Weakness Type (CWE)
Use of Incorrect Operator
EPSS
Base Score:
0.28