CVE-2026-66374
Knot Resolver before 6.4.1 allows remote code execution via a heap-based buffer overflow in the...
Knot Resolver before 6.4.1 allows remote code execution via a heap-based buffer overflow in the DoQ (DNS-over-QUIC) receive path.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- High
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Knot Resolver before 6.4.1 allows remote code execution via a heap-based buffer overflow in the DoQ (DNS-over-QUIC) receive path.
- Record
CVE-2026-66374- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:L - Weakness
- CWE-1284
- Updated
- 2026-11-02
EUVDEUVD-2026-48763
Knot Resolver before 6.4.1 allows remote code execution via a heap-based buffer overflow in the DoQ (DNS-over-QUIC) receive path.
- Record
EUVD-2026-48763- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:L - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-pw7g-jh5j-6w4m
Knot Resolver before 6.4.1 allows remote code execution via a heap-based buffer overflow in the...
Knot Resolver before 6.4.1 allows remote code execution via a heap-based buffer overflow in the DoQ (DNS-over-QUIC) receive path.
- Record
GHSA-pw7g-jh5j-6w4m- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:L - Weakness
- CWE-1284
- Updated
- 2026-11-02
NVD
Knot Resolver before 6.4.1 allows remote code execution via a heap-based buffer overflow in the DoQ (DNS-over-QUIC) receive path.
- Record
CVE-2026-66374- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:L - Weakness
- CWE-1284
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-66374
Knot Resolver before 6.4.1 allows remote code execution via a heap-based buffer overflow in the DoQ (DNS-over-QUIC) receive path.
- Record
DEBIAN-CVE-2026-66374- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:L - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-66374
Knot Resolver before 6.4.1 allows remote code execution via a heap-based buffer overflow in the DoQ (DNS-over-QUIC) receive path.
- Record
UBUNTU-CVE-2026-66374- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:L - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
knot-resolverDebian:14 |
before 6.4.1-1, plus listed versions 5.7.5-16.0.10-16.0.12-16.0.13-16.0.14-1 Show 12 moreShow less6.0.15-16.0.15-26.0.15-36.0.15-46.0.17-16.0.9-16.1.0-16.1.0-26.2.0-16.2.0-26.3.0-16.4.0-1 |
6.4.1-1 |
knot-resolverUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 1.0.0~beta2-123-g6134920-11.0.0~beta3-11.0.0~beta3-1ubuntu0.1~esm1 |
None known |
knot-resolverUbuntu:Pro:18.04:LTS |
All versions, plus listed versions 1.3.3-11.5.0-41.5.1-11.5.2-12.0.0-3 Show 4 moreShow less2.1.0-12.1.0-22.1.1-12.1.1-1ubuntu0.1~esm2 |
None known |
knot-resolverUbuntu:20.04:LTS |
All versions, plus listed versions 3.2.1-33.2.1-3ubuntu13.2.1-3ubuntu23.2.1-3ubuntu2.13.2.1-3ubuntu2.2 |
None known |
knot-resolverUbuntu:Pro:22.04:LTS |
All versions, plus listed versions 5.3.1-15.4.2-15.4.3-15.4.4-15.4.4-1ubuntu0.1~esm1 |
None known |
knot-resolverUbuntu:24.04:LTS |
All versions, plus listed versions 5.6.0-1.15.7.0-1build15.7.1-15.7.2-1 |
None known |
knot-resolverUbuntu:26.04:LTS |
All versions, plus listed versions 5.7.5-16.0.15-4build16.0.17-16.2.0-2 |
None known |
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | venglin/knot-doq | 2026-07-23 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-66374 is a high vulnerability (CVSS 8.1) in Nic Knot Resolver, published July 25, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.62%, the 50th percentile. Fixed in knot-resolver 6.4.1-1.