CVE-2026-0398

Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor

5.3 MediumFix available

CVE-2026-0398 is a medium vulnerability (CVSS 5.3) in Powerdns Recursor, published February 9, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.34%, the 28th percentile. Fixed in pdns-recursor 5.3.5-r0.

Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor.

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: None
Availability: Low

Exploit likelihood

0.34%Up 0.3 points since Feb 10, 2026

What each source reports

CVE List Score used 5.3

Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor

Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor.

Record: CVE-2026-0398
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-770
Updated: 2026-11-02

EUVDEUVD-2026-6923 5.3

Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor.

Record: EUVD-2026-6923
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated: 2026-11-02

GitHub AdvisoriesGHSA-6253-fq97-5xpm 5.3

Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache...

Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor.

Record: GHSA-6253-fq97-5xpm
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-770
Updated: 2026-11-02

NVD 5.3

Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor.

Record: CVE-2026-0398
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-770
Updated: 2026-11-02

OSVALPINE-CVE-2026-0398 5.3

Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor.

Record: ALPINE-CVE-2026-0398
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated: 2026-11-03

OSV 5.3

Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor

Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor.

Record: CVE-2026-0398
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-0398 5.3

Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor.

Record: DEBIAN-CVE-2026-0398
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-0398 5.3

Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor.

Record: UBUNTU-CVE-2026-0398
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated: 2026-11-02

Affected products

powerdns recursor

Affected packages

Affected packages
Package	Affected	Fixed
`pdns-recursor` Alpine:v3.23	before 5.3.5-r0	5.3.5-r0
`pdns-recursor` Alpine:v3.24	before 5.3.5-r0	5.3.5-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 5.2.8-0+deb13u1, plus listed versions 5.2.4-25.2.4-2+deb13u15.2.5-15.2.6-0+deb13u15.2.7-0+deb13u1	5.2.8-0+deb13u1
`pdns-recursor` Debian:14	before 5.3.5-1, plus listed versions 5.2.4-25.2.5-15.3.0-15.3.0-25.3.0-3 Show 6 moreShow less 5.3.0-45.3.0-55.3.1-15.3.3-15.3.4-15.3.4-2	5.3.5-1
`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
When	Changed	Sources
2026-11-03	affected, aliases, references	OSV
2026-11-02	created	CVE List, EUVD, GitHub Advisories, NVD, OSV

References

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Left out here: 2 versions. The JSON record has them.