CVE-2026-33610

Possible file descriptor exhaustion in forward-dnsupdate

5.9 MediumFix available

A rogue primary server may cause file descriptor exhaustion and eventually a denial of service, when a PowerDNS secondary server forwards a DNS update request to it.

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: None
Integrity: None
Availability: High

Exploit likelihood

0.39%Up 0.4 points since Apr 23, 2026

What each source reports

CVE List Score used 5.9

Possible file descriptor exhaustion in forward-dnsupdate

A rogue primary server may cause file descriptor exhaustion and eventually a denial of service, when a PowerDNS secondary server forwards a DNS update request to it.

Record: CVE-2026-33610
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-400
Updated: 2026-11-02

EUVDEUVD-2026-24949 5.9

A rogue primary server may cause file descriptor exhaustion and eventually a denial of service, when a PowerDNS secondary server forwards a DNS update request to it.

Record: EUVD-2026-24949
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-7rv6-r2fm-295c 5.9

A rogue primary server may cause file descriptor exhaustion and eventually a denial of service,...

A rogue primary server may cause file descriptor exhaustion and eventually a denial of service, when a PowerDNS secondary server forwards a DNS update request to it.

Record: GHSA-7rv6-r2fm-295c
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-400
Updated: 2026-11-02

NVD 5.9

A rogue primary server may cause file descriptor exhaustion and eventually a denial of service, when a PowerDNS secondary server forwards a DNS update request to it.

Record: CVE-2026-33610
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-400
Updated: 2026-11-02

OSVALPINE-CVE-2026-33610 7.5

A rogue primary server may cause file descriptor exhaustion and eventually a denial of service, when a PowerDNS secondary server forwards a DNS update request to it.

Record: ALPINE-CVE-2026-33610
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-03

OSV 5.9

Possible file descriptor exhaustion in forward-dnsupdate

A rogue primary server may cause file descriptor exhaustion and eventually a denial of service, when a PowerDNS secondary server forwards a DNS update request to it.

Record: CVE-2026-33610
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-33610 7.5

A rogue primary server may cause file descriptor exhaustion and eventually a denial of service, when a PowerDNS secondary server forwards a DNS update request to it.

Record: DEBIAN-CVE-2026-33610
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-33610 5.9

A rogue primary server may cause file descriptor exhaustion and eventually a denial of service, when a PowerDNS secondary server forwards a DNS update request to it.

Record: UBUNTU-CVE-2026-33610
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Affected products

powerdns authoritative

Affected packages

Affected packages
Package	Affected	Fixed
`pdns` Alpine:v3.23	before 5.0.4-r0	5.0.4-r0
`pdns` Alpine:v3.24	before 5.0.4-r0	5.0.4-r0
`pdns` Debian:12	All versions, plus listed versions 4.7.3-24.8.0-14.8.0-24.8.1-14.8.1-2 Show 37 moreShow less 4.8.2-14.8.2-24.8.3-14.8.3-24.8.3-34.8.3-44.9.0-14.9.0-24.9.1-14.9.1-24.9.1-34.9.2-14.9.2-24.9.3-14.9.3-24.9.3-34.9.4-14.9.4-24.9.7-15.0.0-15.0.0-25.0.1-15.0.2-15.0.3-15.0.4-15.0.5-15.0.5-25.0.5-35.0.5-45.1.0-15.1.1-15.1.1-25.1.1-35.1.2-15.1.3-15.1.4-15.1.5-1	None known
`pdns` Debian:13	before 4.9.14-0+deb13u1, plus listed versions 4.9.7-1	4.9.14-0+deb13u1
`pdns` Debian:14	before 5.0.4-1, plus listed versions 4.9.7-15.0.0-15.0.0-25.0.1-15.0.2-15.0.3-1	5.0.4-1
`pdns` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 3.4.5-1build23.4.6-23.4.6-33.4.7-13.4.7-2 Show 5 moreShow less 4.0.0~alpha1-14.0.0~alpha2-24.0.0~alpha2-34.0.0~alpha2-3build14.0.0~alpha2-3ubuntu0.1~esm1	None known
`pdns` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 4.0.4-24.0.4-2build14.0.5-14.1.0-14.1.0-24.1.0-2build14.1.1-14.1.1-1ubuntu0.1~esm1	None known
`pdns` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 4.1.6-3build14.2.0-14.2.1-14.2.1-1build14.2.1-1build24.2.1-1ubuntu0.1~esm1	None known
`pdns` Ubuntu:Pro:22.04:LTS	All versions, plus listed versions 4.4.1-1build14.4.1-34.4.1-44.5.2-1build14.5.3-14.5.3-1ubuntu0.1~esm1	None known
`pdns` Ubuntu:24.04:LTS	All versions, plus listed versions 4.8.1-1build14.8.3-24.8.3-2build14.8.3-34.8.3-44.8.3-4build24.8.3-4build3	None known
`pdns` Ubuntu:25.10	All versions, plus listed versions 4.9.4-24.9.7-14.9.7-1build25.0.0-2	None known
`pdns` Ubuntu:26.10	All versions, plus listed versions 5.0.2-1build15.0.5-45.1.0-15.1.1-15.1.1-2 Show 4 moreShow less 5.1.1-35.1.2-15.1.3-15.1.4-1	None known
`pdns` Ubuntu:26.04:LTS	All versions, plus listed versions 5.0.0-25.0.1-15.0.2-15.0.2-1build1	None known

History

History
Recorded	Changed	Sources
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-2026-33610 is a medium vulnerability (CVSS 5.9) in Powerdns Authoritative, published April 22, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.39%, the 33rd percentile. Fixed in pdns 5.0.4-r0.

References

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