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CVE-2026-33259

Concurrent modification of RPZ data can lead to denial of servce

Medium5.0EPSS 0.22%
Published
Updated
Reserved
Assigned by
OX

Description

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.

Scores

CVSS scores of CVE-2026-33259, by who scored it
Scored byCVSSScoreVector
OXCNA (assigner)3.1Medium5.0CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H
NVDNVD · Analyzed3.1Medium5.0CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H
EPSS (exploitation in 30 days)
0.22% · top 87% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.0.

Weakness

Affected products

  • PowerDNS · Recursor

    • affected 5.4.0 – < 5.4.1
    • affected 5.3.0 – < 5.3.6
    • affected 5.2.0 – < 5.2.9

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .