Vulnerability DatabaseCVE-2026-123574
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CVE-2026-123574
Published:November 08, 2026
Updated:November 09, 2026
The zone file parser in the hickory-proto crate of Hickory DNS 0.24.0 before 0.26.2 panics when a single token in a zone file is 4096 bytes or longer. Attackers who can supply untrusted zone files to an application using the parser can trigger the panic to cause a denial of service.
Affected Packages
https://github.com/hickory-dns/hickory-dns.git (GITHUB):
Affected version(s) >=0.2.0 <v0.26.2 || >=0.3.0 <v0.26.2 || =0.4.0 <v0.26.2 || >=0.5.0 <v0.26.2 || =0.6.0 <v0.26.2 || >=0.7.0 <v0.26.2 || >=0.8.0 <v0.26.2 || >=0.9.0 <v0.26.2 || >=0.10.0 <v0.26.2 || =0.11.0 <v0.26.2 || =c0.12.0 <v0.26.2 || =v0.13.0 <v0.26.2 || =v0.14.0 <v0.26.2 || =cs0.15.0 <v0.26.2 || >=cs0.16 <v0.26.2 || =r0.12_cs0.17 <v0.26.2 || >=0.18.0.alpha.2 <v0.26.2 || >=0.19.0 <v0.26.2 || =v0.19.7 <v0.26.2 || >=v0.20.0-alpha.1 <v0.26.2 || >=v0.21.0-alpha.1 <v0.26.2 || >=v0.22.0 <v0.26.2 || >=v0.23.0-alpha.1 <v0.26.2 || >=v0.24.0 <v0.26.2 || >=v0.25.0-alpha.1 <v0.26.2 || >=v0.26.0-alpha.1 <v0.26.2 || =resolver.0.4.0 <v0.26.2 || =r0.5.0 <v0.26.2 || =r0.6.0 <v0.26.2 || =r0.7.0 <v0.26.2 || >=r0.8.0 <v0.26.2 || >=r0.9.0 <v0.26.2 || >=r0.10.0 <v0.26.2 || >=r0.11 <v0.26.2
Fix Suggestion:
Update to version v0.26.2
hickory-proto (RUST):
Affected version(s) >=0.25.0-alpha.1 <0.26.2 || >=0.26.0-alpha.1 <0.26.2 || >=0.24.0 <0.26.2
Fix Suggestion:
Update to version 0.26.2
Related Resources (4)
https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-4rph-pmrw-mwpw
https://nvd.nist.gov/vuln/detail/CVE-2026-123574
https://www.vulncheck.com/advisories/hickory-dns-0.24.0-before-0.26.2-denial-of-service-via-zone-file-parser
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/123xxx/CVE-2026-123574.json
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Improper Input Validation
CWE-20
EPSS
Base Score:
0.34