CVE-2026-66374 — HIGH (8.1)

Vulnerability 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.

CVSS Score

8.1

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:L

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality

LOW

Integrity

HIGH

Availability

LOW

Related Weaknesses (CWE)

CWE-1284

References

https://github.com/venglin/knot-doq
https://openwall.com/lists/oss-security/2026/07/23/6
https://github.com/venglin/knot-doq

FAQ

What is CVE-2026-66374?

CVE-2026-66374 is a vulnerability with a CVSS score of 8.1 (HIGH). Knot Resolver before 6.4.1 allows remote code execution via a heap-based buffer overflow in the DoQ (DNS-over-QUIC) receive path.

How severe is CVE-2026-66374?

CVE-2026-66374 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-66374?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.