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CVE-2026-33259

Concurrent modification of RPZ data can lead to denial of servce

5.0 MediumFix available

CVE-2026-33259 is a medium vulnerability (CVSS 5.0) in Powerdns Recursor, published April 22, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.22%, the 13th percentile. Fixed in pdns-recursor 5.3.6-r0.

Having many concurrent transfers of the same RPZ can lead to inconsistent RPZ data, use after free and/or a crash of the recursor. Normally concurrent transfers of the same RPZ zone can only occur with a malfunctioning RPZ provider.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
High
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
High

Exploit likelihood

0.22%Up 0.2 points since Apr 22, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.0

Concurrent modification of RPZ data can lead to denial of servce

Having many concurrent transfers of the same RPZ can lead to inconsistent RPZ data, use after free and/or a crash of the recursor. Normally concurrent transfers of the same RPZ zone can only occur with a malfunctioning RPZ provider.

Record
CVE-2026-33259
CVSS 3.1
5.0 MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H
Weakness
CWE-416
Updated
2026-11-02
EUVDEUVD-2026-24723 5.0

Having many concurrent transfers of the same RPZ can lead to inconsistent RPZ data, use after free and/or a crash of the recursor. Normally concurrent transfers of the same RPZ zone can only occur with a malfunctioning RPZ provider.

Record
EUVD-2026-24723
CVSS 3.1
5.0 MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-6c6h-9v3q-3wqm 5.0

Having many concurrent transfers of the same RPZ can lead to inconsistent RPZ data, use after...

Having many concurrent transfers of the same RPZ can lead to inconsistent RPZ data, use after free and/or a crash of the recursor. Normally concurrent transfers of the same RPZ zone can only occur with a malfunctioning RPZ provider.

Record
GHSA-6c6h-9v3q-3wqm
CVSS 3.1
5.0 MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H
Weakness
CWE-416
Updated
2026-11-02
NVD 5.0

Having many concurrent transfers of the same RPZ can lead to inconsistent RPZ data, use after free and/or a crash of the recursor. Normally concurrent transfers of the same RPZ zone can only occur with a malfunctioning RPZ provider.

Record
CVE-2026-33259
CVSS 3.1
5.0 MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H
Weakness
CWE-416
Updated
2026-11-02
OSVALPINE-CVE-2026-33259 5.0

Having many concurrent transfers of the same RPZ can lead to inconsistent RPZ data, use after free and/or a crash of the recursor. Normally concurrent transfers of the same RPZ zone can only occur with a malfunctioning RPZ provider.

Record
ALPINE-CVE-2026-33259
CVSS 3.1
5.0 MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H
Updated
2026-11-03
OSV 5.0

Concurrent modification of RPZ data can lead to denial of servce

Having many concurrent transfers of the same RPZ can lead to inconsistent RPZ data, use after free and/or a crash of the recursor. Normally concurrent transfers of the same RPZ zone can only occur with a malfunctioning RPZ provider.

Record
CVE-2026-33259
CVSS 3.1
5.0 MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2026-33259 5.0

Having many concurrent transfers of the same RPZ can lead to inconsistent RPZ data, use after free and/or a crash of the recursor. Normally concurrent transfers of the same RPZ zone can only occur with a malfunctioning RPZ provider.

Record
DEBIAN-CVE-2026-33259
CVSS 3.1
5.0 MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-33259 5.0

Having many concurrent transfers of the same RPZ can lead to inconsistent RPZ data, use after free and/or a crash of the recursor. Normally concurrent transfers of the same RPZ zone can only occur with a malfunctioning RPZ provider.

Record
UBUNTU-CVE-2026-33259
CVSS 3.1
5.0 MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
pdns-recursor
Alpine:v3.23
 before 5.3.6-r0
5.3.6-r0
pdns-recursor
Alpine:v3.24
 before 5.4.1-r0
5.4.1-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 5.2.9-0+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+deb13u1
5.2.9-0+deb13u1
pdns-recursor
Debian:14
 before 5.4.1-1, plus listed versions
5.2.4-25.2.5-15.3.0-15.3.0-25.3.0-3
Show 8 moreShow less
5.3.0-45.3.0-55.3.1-15.3.3-15.3.4-15.3.4-25.3.5-15.4.0-1
5.4.1-1
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
WhenChangedSources
2026-11-03affected, aliases, referencesOSV
2026-11-02createdCVE List, EUVD, GitHub Advisories, NVD, OSV

References

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

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