CVE-2026-42390

ZONEMD validation can be bypassed

5.3 MediumFix available

An invalid zone might pass ZONEMD validation while it should not. This is only relevant if ZoneToCache is configured with ZONEMD validation.

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: None
Integrity: Low
Availability: None

Exploit likelihood

0.30%Up 0.1 points since Jun 26, 2026

What each source reports

CVE List Score used 5.3

ZONEMD validation can be bypassed

An invalid zone might pass ZONEMD validation while it should not. This is only relevant if ZoneToCache is configured with ZONEMD validation.

Record: CVE-2026-42390
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness: CWE-20
Updated: 2026-11-02

EUVDEUVD-2026-39359 5.3

An invalid zone might pass ZONEMD validation while it should not. This is only relevant if ZoneToCache is configured with ZONEMD validation.

Record: EUVD-2026-39359
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-3r7g-67q5-53gf 5.3

An invalid zone might pass ZONEMD validation while it should not. This is only relevant if...

An invalid zone might pass ZONEMD validation while it should not. This is only relevant if ZoneToCache is configured with ZONEMD validation.

Record: GHSA-3r7g-67q5-53gf
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness: CWE-20
Updated: 2026-11-02

NVD 5.3

An invalid zone might pass ZONEMD validation while it should not. This is only relevant if ZoneToCache is configured with ZONEMD validation.

Record: CVE-2026-42390
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness: CWE-20
Updated: 2026-11-02

OSV 5.3

ZONEMD validation can be bypassed

An invalid zone might pass ZONEMD validation while it should not. This is only relevant if ZoneToCache is configured with ZONEMD validation.

Record: CVE-2026-42390
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-42390 5.3

An invalid zone might pass ZONEMD validation while it should not. This is only relevant if ZoneToCache is configured with ZONEMD validation.

Record: DEBIAN-CVE-2026-42390
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-42390 5.3

An invalid zone might pass ZONEMD validation while it should not. This is only relevant if ZoneToCache is configured with ZONEMD validation.

Record: UBUNTU-CVE-2026-42390
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated: 2026-11-02

Affected products

powerdns recursor

Affected packages

Affected packages
Package	Affected	Fixed
`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

History

History
Recorded	Changed	Sources
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-2026-42390 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 0.30%, the 22nd percentile. Fixed in pdns-recursor 5.2.11-0+deb13u1.

References

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This page doesn't list everything

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