CVE-2026-123578 (GCVE-0-2026-123578)
Vulnerability from cvelistv5 – Published: 2026-11-08 01:38 – Updated: 2026-11-09 13:55
VLAI
EPSS
VEX
Title
Hickory DNS 0.26.0 before 0.26.2 Response Validation Bypass via QDCOUNT=0
Summary
Hickory DNS hickory-net 0.26.0 before 0.26.2 and hickory-proto 0.25.0 through 0.25.2 skip the check that a UDP response's question section matches the query when the response has an empty question section (QDCOUNT=0), and also skip the case-randomization check. Remote attackers able to inject spoofed UDP responses can send QDCOUNT=0 responses to bypass these checks, weakening defenses against DNS spoofing.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-09 13:55 UTC
CWE
- CWE-290 - Authentication Bypass by Spoofing
Assigner
VulnCheck
CNA
References
2 references
| URL | Tags |
|---|---|
| https://github.com/hickory-dns/hickory-dns/securi… | vendor-advisory |
| https://www.vulncheck.com/advisories/hickory-dns-… | third-party-advisory |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| hickory-dns | hickory-dns |
Affected:
0.26.0 , < 0.26.2
(semver)
Unaffected: 0.26.2 (semver) |
|
| hickory-dns | hickory-dns |
Affected:
0.25.0 , ≤ 0.25.2
(semver)
|
Date Public
2026-09-03 00:00
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