CVE-2026-33254

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Source
https://cve.org/CVERecord?id=CVE-2026-33254
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33254.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-33254
Downstream
Related
Published
2026-04-22T13:45:07.069Z
Modified
2026-07-15T15:53:39.972532Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
Resource exhaustion via DoQ/DoH3 connections
Details

An attacker can create a large number of concurrent DoQ or DoH3 connections, causing unlimited memory allocation in DNSdist and leading to a denial of service. DOQ and DoH3 are disabled by default.

Database specific 
{
    "cna_assigner": "OX",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33254.json"
}
References

Affected packages

Git / github.com/powerdns/pdns

Affected ranges

Type
GIT
Repo
https://github.com/powerdns/pdns
Events
Introduced
298a9d67fb760a12eabe89164f92fb814572aea8
Fixed
642a2bb5b67b2bf5c856819273d8f41fecbc0da8
Introduced
89747e81bc60d7950276d5fda3ca669fa81b7cf9
Fixed
bfd0cbf4bf5c1f8757d0cd94c86ea88caf7b2f6d
Database specific 
{
    "cpe": "cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "1.9.0"
        },
        {
            "fixed": "1.9.13"
        },
        {
            "introduced": "2.0.0"
        },
        {
            "fixed": "2.0.4"
        }
    ],
    "source": "CPE_RANGE"
}

Affected versions

dnsdist-1.*
dnsdist-1.9.0
dnsdist-1.9.1
dnsdist-1.9.10
dnsdist-1.9.11
dnsdist-1.9.2
dnsdist-1.9.3
dnsdist-1.9.4
dnsdist-1.9.5
dnsdist-1.9.6
dnsdist-1.9.7
dnsdist-1.9.8
dnsdist-1.9.9
dnsdist-2.*
dnsdist-2.0.0
dnsdist-2.0.1
dnsdist-2.0.2

Database specific

vanir_signatures_modified 
"2026-07-15T15:53:39Z"
vanir_signatures 
[
    {
        "signature_type": "Line",
        "deprecated": false,
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "152898936404715912717012814958473792269",
                "4575082192570469972237185990035341899",
                "177678008705605303260633753884530753700",
                "136680451824217662945478382805808332729",
                "204969285221527224213910579710674063651",
                "66014210593085438182573307698386496097",
                "17525951591113452044796585153110335921"
            ]
        },
        "signature_version": "v1",
        "source": "https://github.com/powerdns/pdns/commit/642a2bb5b67b2bf5c856819273d8f41fecbc0da8",
        "id": "CVE-2026-33254-2829cf85",
        "target": {
            "file": "pdns/dnscrypt.cc"
        }
    },
    {
        "signature_type": "Function",
        "deprecated": false,
        "digest": {
            "length": 706.0,
            "function_hash": "172078194597412758162700597563448847475"
        },
        "signature_version": "v1",
        "source": "https://github.com/powerdns/pdns/commit/642a2bb5b67b2bf5c856819273d8f41fecbc0da8",
        "id": "CVE-2026-33254-4b79aae9",
        "target": {
            "function": "DNSCryptQuery::computePaddingSize",
            "file": "pdns/dnscrypt.cc"
        }
    },
    {
        "signature_type": "Function",
        "deprecated": false,
        "digest": {
            "length": 3007.0,
            "function_hash": "219139187612696838153193600735147256736"
        },
        "signature_version": "v1",
        "source": "https://github.com/powerdns/pdns/commit/642a2bb5b67b2bf5c856819273d8f41fecbc0da8",
        "id": "CVE-2026-33254-b8fc9376",
        "target": {
            "function": "DNSCryptQuery::encryptResponse",
            "file": "pdns/dnscrypt.cc"
        }
    },
    {
        "signature_type": "Line",
        "deprecated": false,
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "6864841829016440226917919286801415092",
                "177254253808237988567579585374243740684",
                "281318965586644528261302210434407655020",
                "236182772979616684272007619339406923158",
                "321739554045469880473225520600194266713",
                "204969285221527224213910579710674063651",
                "66014210593085438182573307698386496097",
                "17525951591113452044796585153110335921"
            ]
        },
        "signature_version": "v1",
        "source": "https://github.com/powerdns/pdns/commit/bfd0cbf4bf5c1f8757d0cd94c86ea88caf7b2f6d",
        "id": "CVE-2026-33254-d901a0a8",
        "target": {
            "file": "pdns/dnsdistdist/dnscrypt.cc"
        }
    },
    {
        "signature_type": "Function",
        "deprecated": false,
        "digest": {
            "length": 839.0,
            "function_hash": "276771802078087666188325581091504637136"
        },
        "signature_version": "v1",
        "source": "https://github.com/powerdns/pdns/commit/bfd0cbf4bf5c1f8757d0cd94c86ea88caf7b2f6d",
        "id": "CVE-2026-33254-e809c528",
        "target": {
            "function": "DNSCryptQuery::computePaddingSize",
            "file": "pdns/dnsdistdist/dnscrypt.cc"
        }
    },
    {
        "signature_type": "Function",
        "deprecated": false,
        "digest": {
            "length": 3491.0,
            "function_hash": "259782563136530440917701746095514260405"
        },
        "signature_version": "v1",
        "source": "https://github.com/powerdns/pdns/commit/bfd0cbf4bf5c1f8757d0cd94c86ea88caf7b2f6d",
        "id": "CVE-2026-33254-f8ee4cee",
        "target": {
            "function": "DNSCryptQuery::encryptResponse",
            "file": "pdns/dnsdistdist/dnscrypt.cc"
        }
    }
]
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33254.json"