CVE-2026-40012

Information about ECS zero scoped answers might leak to clients that use a specific ECS

5.3 MediumFix available

ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations that have ECS enabled;

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: None
Availability: None

Exploit likelihood

0.45%Up 0.1 points since Jun 26, 2026

What each source reports

CVE List Score used5.3

Information about ECS zero scoped answers might leak to clients that use a specific ECS

ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations that have ECS enabled;

Record: CVE-2026-40012
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness: CWE-524
Updated: 2026-11-02

EUVDEUVD-2026-393565.3

ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations that have ECS enabled;

Record: EUVD-2026-39356
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-fmvv-f47m-6c7p5.3

ECS zero scoped answers are stored in the packet cache while they should not. This impacts only...

ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations that have ECS enabled;

Record: GHSA-fmvv-f47m-6c7p
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness: CWE-524
Updated: 2026-11-02

NVD5.3

ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations that have ECS enabled;

Record: CVE-2026-40012
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness: CWE-524
Updated: 2026-11-02

OSVALPINE-CVE-2026-400125.3

ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations that have ECS enabled;

Record: ALPINE-CVE-2026-40012
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated: 2026-11-03

OSV5.3

Information about ECS zero scoped answers might leak to clients that use a specific ECS

ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations that have ECS enabled;

Record: CVE-2026-40012
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated: 2026-11-12

OSVDEBIAN-CVE-2026-400125.3

ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations that have ECS enabled;

Record: DEBIAN-CVE-2026-40012
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-400125.3

ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations that have ECS enabled;

Record: UBUNTU-CVE-2026-40012
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated: 2026-11-02

OSVopenSUSE-SU-2026:12532-1No score

pdns-recursor-5.4.8-1.1 on GA media

These are all security issues fixed in the pdns-recursor-5.4.8-1.1 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2026:12532-1
Updated: 2026-11-12

Affected products

powerdns recursor

Affected packages

Affected packages
Package	Affected	Fixed
`pdns-recursor` Alpine:v3.24	before 5.4.3-r0	5.4.3-r0
`pdns-recursor` Debian:12	All versions, plus listed versions 4.8.4-14.8.6-14.8.7-14.8.8-14.8.8-1+deb12u1 Show 45 moreShow less 4.9.0-14.9.0-24.9.1-14.9.1-24.9.1-34.9.1-44.9.2-14.9.2-24.9.3-14.9.4-14.9.5-15.0.5-15.0.7-15.0.7-25.0.9-15.1.3-15.1.3-25.2.0-15.2.0-25.2.0-35.2.0-45.2.0-55.2.1-15.2.2-15.2.2-25.2.4-15.2.4-25.2.5-15.3.0-15.3.0-25.3.0-35.3.0-45.3.0-55.3.1-15.3.3-15.3.4-15.3.4-25.3.5-15.4.0-15.4.1-15.4.1-25.4.2-15.4.2-25.4.3-15.4.4-1	None known
`pdns-recursor` Debian:13	before 5.2.11-0+deb13u1, plus listed versions 5.2.4-25.2.4-2+deb13u15.2.5-15.2.6-0+deb13u15.2.7-0+deb13u15.2.8-0+deb13u15.2.9-0+deb13u1	5.2.11-0+deb13u1
`pdns-recursor` Debian:14	before 5.4.3-1, plus listed versions 5.2.4-25.2.5-15.3.0-15.3.0-25.3.0-3 Show 12 moreShow less 5.3.0-45.3.0-55.3.1-15.3.3-15.3.4-15.3.4-25.3.5-15.4.0-15.4.1-15.4.1-25.4.2-15.4.2-2	5.4.3-1
`pdns-recursor` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 3.7.3-14.0.0~alpha1-14.0.0~alpha1-24.0.0~alpha2-24.0.0~alpha2-2ubuntu0.14.0.0~alpha2-2ubuntu0.1+esm1	None known
`pdns-recursor` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 4.0.6-14.0.6-1build14.0.7-14.1.1-14.1.1-1build14.1.1-24.1.1-2ubuntu0.1~esm1	None known
`pdns-recursor` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 4.2.0-64.2.1-14.2.1-1build14.2.1-1build24.2.1-1ubuntu0.1~esm1	None known
`pdns-recursor` Ubuntu:Pro:22.04:LTS	All versions, plus listed versions 4.4.2-34.6.0-1ubuntu14.6.0-1ubuntu1+esm1	None known
`pdns-recursor` Ubuntu:24.04:LTS	All versions, plus listed versions 4.9.0-24.9.1-44.9.2-14.9.2-1build14.9.2-24.9.3-14.9.3-1build24.9.3-1build3	None known
`pdns-recursor` Ubuntu:25.10	All versions, plus listed versions 5.2.0-55.2.2-15.2.2-25.2.4-25.2.4-2build2	None known
`pdns-recursor` Ubuntu:26.10	All versions, plus listed versions 5.3.5-15.4.3-15.4.5-1	None known
`pdns-recursor` Ubuntu:26.04:LTS	All versions, plus listed versions 5.2.4-2build25.3.1-15.3.3-15.3.4-15.3.4-1build15.3.4-25.3.5-1	None known
`pdns-recursor` openSUSE:Tumbleweed From an advisory covering 34 CVEs	before 5.4.8-1.1	5.4.8-1.1

History

History
Recorded	Changed	Sources
Nov 12, 2026	affected, aliases, references	OSV
Nov 12, 2026	facts	OSV
Nov 3, 2026	affected, aliases, references	OSV
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-40012 is a medium vulnerability (CVSS 5.3) in Powerdns Recursor, published June 25, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.45%, the 39th percentile. Fixed in pdns-recursor 5.4.3-r0.

References

Show 39 moreShow less

This page doesn't list everything

Left out here: 4 versions. The JSON record has them.