CVE-2026-66374 Details
Description
Knot Resolver before 6.4.1 allows remote code execution via a heap-based buffer overflow in the DoQ (DNS-over-QUIC) receive path.
A remote code execution vulnerability has been identified in Knot Resolver versions prior to 6.4.1. The issue arises from a heap-based buffer overflow in the DNS-over-QUIC (DoQ) receive path, allowing for memory corruption that can be exploited to execute arbitrary code as the 'knot-resolver' service user. The vulnerability is triggered by an unauthenticated attacker over a single QUIC connection.
Users are advised to upgrade to Knot Resolver version 6.4.1, which addresses this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 25, 2026CISA-ADP
Assessed Jul 27, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/venglin/knot-doq | CISA-ADP | Exploit |
| https://github.com/venglin/knot-doq | [email protected] | Exploit |
| https://openwall.com/lists/oss-security/2026/07/23/6 | [email protected] | Mailing ListRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-1284 | Improper Validation of Specified Quantity in Input | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Knot Resolver | 6.3.0 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 27, 2026 | CVE Modified | CISA-ADP |
| Jul 25, 2026 | New CVE Received | [email protected] |