CVE-2026-52686

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Source
https://cve.org/CVERecord?id=CVE-2026-52686
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52686.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-52686
Downstream
Published
2026-07-23T08:03:37.563Z
Modified
2026-07-28T04:02:55.944973787Z
Severity
  • 3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
Summary
Wildcard CNAME proof validation bypass
Details

The issue is a DNSSEC validation bypass where wildcard expansion proofs (NSEC/NSEC3 records) are accepted without signature validation when the wildcard answer is a CNAME or DNAME record.

Database specific 
{
    "cna_assigner": "OX",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52686.json"
}
References

Affected packages

Git / github.com/powerdns/pdns

Affected ranges

Type
GIT
Repo
https://github.com/powerdns/pdns
Events
Introduced
544037cd123e8662877b5dc0b7963f5a094a2faf
Fixed
b74225ba558d1f9f91afea21e2496e959b13a869
Introduced
ff33413345dc6a826ff0f37f0c78cd60cdf15689
Fixed
53dfd1af948d1ff716bfd7615c99d442f984f2af
Introduced
c95adbda8ce519923dfdbe7947d82a2692e18af9
Fixed
64c4f00f2b3d4d4153837e0dac7979108bb7749d
Database specific 
{
    "extracted_events": [
        {
            "introduced": "5.2.0"
        },
        {
            "fixed": "5.2.12"
        },
        {
            "introduced": "5.3.0"
        },
        {
            "fixed": "5.3.9"
        },
        {
            "introduced": "5.4.0"
        },
        {
            "fixed": "5.4.4"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

rec-5.*
rec-5.2.0
rec-5.2.10
rec-5.2.2
rec-5.2.4
rec-5.2.5
rec-5.2.6
rec-5.2.8
rec-5.3.0
rec-5.3.1
rec-5.3.4
rec-5.3.7
rec-5.4.0
rec-5.4.0-rc1
rec-5.4.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52686.json"