Read the docs
TI-2026-47140 Aliases CVE-2026-66374GHSA-pw7g-jh5j-6w4m

Knot Resolver before 6.4.1 allows remote code execution via a heap-based buffer overflow…

Priority HIGH 68CWE-1284Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
Low · High · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

Knot Resolver before 6.4.1 allows remote code execution via a heap-based buffer overflow in the DoQ (DNS-over-QUIC) receive path.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00624 50th percentileScored 2026-11-07
Fix Fixed Knot Resolver (nic): 6.4.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CZ.NICKnot Resolverbefore 6.4.16.4.1Patch availableCNA
  • Knot Resolver VendorCZ.NIC Affected before 6.4.1 Fixed in 6.4.1 Patch available CNA

Remediation

  • Fix · CNA Knot Resolver (nic) Fixed in 6.4.1

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-66374
  2. 2026-10-03 Alias added: GHSA-pw7g-jh5j-6w4m
  3. 2026-11-04 EPSS moved to the 50th–90th percentile

References

Other 2

  • TI-2023-27571 Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related… CVSS 3.1HIGH 7.5
  • TI-2021-08533 BIRD through 2.0.7 does not provide functionality for password authentication of BGP… CVSS 3.1MEDIUM 6.8
  • TI-2021-02344 Foris before 101.1.1, as used in Turris OS, lacks certain HTML escaping in the login template. CVSS 3.1CRITICAL 9.8
  • TI-2020-10072 Knot Resolver before 5.1.1 allows traffic amplification via a crafted DNS answer from an… CVSS 3.1HIGH 7.5
  • TI-2022-19055 Knot Resolver before 5.5.3 allows remote attackers to cause a denial of service (CPU… CVSS 3.1HIGH 7.5
  • TI-2023-24930 Knot Resolver before 5.7.0 performs many TCP reconnections upon receiving certain nonsensical responses from servers. CVSS 3.1HIGH 7.5
See all 20 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences