CVE-2026-123584
Hickory-DNS 0.26.0 before 0.26.2 UDP Client Denial of Service via Spoofed Responses
CVSS Score
5.9
EPSS Score
0.0%
EPSS Percentile
0th
The hickory-net crate in Hickory DNS 0.26.0 before 0.26.2 stops listening and returns an error when a client UDP connection receives a datagram that cannot be parsed as a DNS message. Remote attackers who guess the query's source port, without knowing the transaction ID, can spoof malformed responses to abort client queries, causing denial of service.
| CWE | CWE-696 |
| Vendor | hickory-dns |
| Product | hickory-dns |
| Published | Nov 8, 2026 |
Stay Ahead of the Next One
Get instant alerts for hickory-dns hickory-dns
Be the first to know when new medium vulnerabilities affecting hickory-dns hickory-dns are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
hickory-dns / hickory-dns
0.26.0 < 0.26.2
References
Credits
🔍 qifan-sailboat