What’s Vulnerable › Vulnerabilities

CVE-2026-66374

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-25 · updated 2026-10-24
• Weakness: CWE-1284

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.

Affected products

• CZ.NIC knot-resolver: before 6.4.1 — fixed in 6.4.1

How to fix

Upgrade to a fixed version: CZ.NIC knot-resolver 6.4.1. Check the vendor advisory for mitigations.

References

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

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