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CVE-2026-33258

Crafted zones can cause increased resource usage

5.3 MediumFix available

By publishing and querying a crafted zone an attacker can cause allocation of large entries in the negative and aggressive NSEC(3) caches.

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

0.58%Up 0.6 points since Apr 22, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.3

Crafted zones can cause increased resource usage

By publishing and querying a crafted zone an attacker can cause allocation of large entries in the negative and aggressive NSEC(3) caches.

Record
CVE-2026-33258
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-2026-24721 5.3

By publishing and querying a crafted zone an attacker can cause allocation of large entries in the negative and aggressive NSEC(3) caches.

Record
EUVD-2026-24721
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-mfmv-pg93-65w5 5.3

By publishing and querying a crafted zone an attacker can cause allocation of large entries in...

By publishing and querying a crafted zone an attacker can cause allocation of large entries in the negative and aggressive NSEC(3) caches.

Record
GHSA-mfmv-pg93-65w5
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

By publishing and querying a crafted zone an attacker can cause allocation of large entries in the negative and aggressive NSEC(3) caches.

Record
CVE-2026-33258
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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-770
Updated
2026-11-02
OSVALPINE-CVE-2026-33258 7.5

By publishing and querying a crafted zone an attacker can cause allocation of large entries in the negative and aggressive NSEC(3) caches.

Record
ALPINE-CVE-2026-33258
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 5.3

Crafted zones can cause increased resource usage

By publishing and querying a crafted zone an attacker can cause allocation of large entries in the negative and aggressive NSEC(3) caches.

Record
CVE-2026-33258
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-2026-33258 7.5

By publishing and querying a crafted zone an attacker can cause allocation of large entries in the negative and aggressive NSEC(3) caches.

Record
DEBIAN-CVE-2026-33258
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-2026-33258 5.3

By publishing and querying a crafted zone an attacker can cause allocation of large entries in the negative and aggressive NSEC(3) caches.

Record
UBUNTU-CVE-2026-33258
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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

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
RecordedChangedSources
affected, aliases, referencesOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

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

In short

CVE-2026-33258 is a medium vulnerability (CVSS 5.3) 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 0.58%, the 47th percentile. Fixed in pdns-recursor 5.3.6-r0.

References

Show 5 moreShow less
This page doesn't list everything

Left out here: 5 versions. The JSON record has them.

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