CVE-2026-42004

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Source
https://cve.org/CVERecord?id=CVE-2026-42004
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42004.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-42004
Downstream
Published
2026-06-25T12:24:20.140Z
Modified
2026-07-15T21:33:35.936029Z
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
EDNS options smuggling
Details

An attacker can send a crafted EDNS OPT record that will be ignored by DNSdist’s filtering rules, but will be rewritten as a valid OPT record when EDNS Client Subnet is inserted, causing the backend to see the EDNS option(s) that DNSdist did not filter.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42004.json",
    "cna_assigner": "OX"
}
References

Affected packages

Git / github.com/powerdns/pdns

Affected ranges

Type
GIT
Repo
https://github.com/powerdns/pdns
Events
Introduced
298a9d67fb760a12eabe89164f92fb814572aea8
Fixed
3348a4f5e1ea95ed90ad6bbdf9c7f12be72e9bfc
Introduced
89747e81bc60d7950276d5fda3ca669fa81b7cf9
Fixed
5bd46a775a7d72376c6a22b2313173a187d439dd
Database specific 
{
    "extracted_events": [
        {
            "introduced": "1.9.0"
        },
        {
            "fixed": "1.9.15"
        },
        {
            "introduced": "2.0.0"
        },
        {
            "fixed": "2.0.7"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

dnsdist-1.*
dnsdist-1.9.0
dnsdist-1.9.1
dnsdist-1.9.10
dnsdist-1.9.11
dnsdist-1.9.14
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
dnsdist-2.0.5
dnsdist-2.0.6

Database specific

vanir_signatures 
[
    {
        "source": "https://github.com/powerdns/pdns/commit/3348a4f5e1ea95ed90ad6bbdf9c7f12be72e9bfc",
        "signature_version": "v1",
        "signature_type": "Function",
        "digest": {
            "function_hash": "175905571297022484819797437345790495302",
            "length": 6030.0
        },
        "deprecated": false,
        "id": "CVE-2026-42004-39fe2f8e",
        "target": {
            "function": "feed",
            "file": "ext/yahttp/yahttp/reqresp.cpp"
        }
    },
    {
        "source": "https://github.com/powerdns/pdns/commit/3348a4f5e1ea95ed90ad6bbdf9c7f12be72e9bfc",
        "signature_version": "v1",
        "signature_type": "Line",
        "digest": {
            "line_hashes": [
                "146073261330685155030523374299187221356",
                "139999140489202660150035160998558678530",
                "260398486233326308600521181399778936346",
                "178066237530059398734757326132960946649"
            ],
            "threshold": 0.9
        },
        "deprecated": false,
        "id": "CVE-2026-42004-5ad4401b",
        "target": {
            "file": "ext/yahttp/yahttp/reqresp.cpp"
        }
    },
    {
        "source": "https://github.com/powerdns/pdns/commit/5bd46a775a7d72376c6a22b2313173a187d439dd",
        "signature_version": "v1",
        "signature_type": "Line",
        "digest": {
            "line_hashes": [
                "146073261330685155030523374299187221356",
                "139999140489202660150035160998558678530",
                "260398486233326308600521181399778936346",
                "178066237530059398734757326132960946649"
            ],
            "threshold": 0.9
        },
        "deprecated": false,
        "id": "CVE-2026-42004-8834b793",
        "target": {
            "file": "ext/yahttp/yahttp/reqresp.cpp"
        }
    },
    {
        "source": "https://github.com/powerdns/pdns/commit/5bd46a775a7d72376c6a22b2313173a187d439dd",
        "signature_version": "v1",
        "signature_type": "Function",
        "digest": {
            "function_hash": "237403263111315157988973709551044007080",
            "length": 6074.0
        },
        "deprecated": false,
        "id": "CVE-2026-42004-f428faf8",
        "target": {
            "function": "feed",
            "file": "ext/yahttp/yahttp/reqresp.cpp"
        }
    }
]
vanir_signatures_modified 
"2026-07-15T21:33:35Z"
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42004.json"