FKIE_CVE-2026-27853
Vulnerability from fkie_nvd - Published: 2026-03-31 12:16 - Updated: 2026-07-25 10:10
Severity
5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/
Summary
An attacker might be able to trigger an out-of-bounds write by sending crafted DNS responses to a DNSdist using the DNSQuestion:changeName or DNSResponse:changeName methods in custom Lua code. In some cases the rewritten packet might become larger than the initial response and even exceed 65535 bytes, potentially leading to a crash resulting in denial of service.
References
{
"affected": [
{
"affectedData": [
{
"collectionURL": "https://repo.powerdns.com/",
"defaultStatus": "unaffected",
"modules": [
"DNS packet writer"
],
"packageName": "dnsdist",
"product": "DNSdist",
"programFiles": [
"dnswriter.cc"
],
"repo": "https://github.com/PowerDNS/pdns",
"vendor": "PowerDNS",
"versions": [
{
"lessThan": "1.9.12",
"status": "affected",
"version": "1.9.0",
"versionType": "semver"
},
{
"lessThan": "2.0.3",
"status": "affected",
"version": "2.0.0",
"versionType": "semver"
}
]
}
],
"source": "security@open-xchange.com"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:*",
"matchCriteriaId": "628B3B94-81DE-496E-B36A-B79A3DFFE1F4",
"versionEndExcluding": "1.9.12",
"versionStartIncluding": "1.9.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:*",
"matchCriteriaId": "9AC850DD-FDD8-4C48-B861-4BBAF423FF57",
"versionEndExcluding": "2.0.3",
"versionStartIncluding": "2.0.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "An attacker might be able to trigger an out-of-bounds write by sending crafted DNS responses to a DNSdist using the DNSQuestion:changeName or DNSResponse:changeName methods in custom Lua code. In some cases the rewritten packet might become larger than the initial response and even exceed 65535 bytes, potentially leading to a crash resulting in denial of service."
},
{
"lang": "es",
"value": "Un atacante podr\u00eda desencadenar una escritura fuera de l\u00edmites enviando respuestas DNS manipuladas a un DNSdist utilizando los m\u00e9todos DNSQuestion:changeName o DNSResponse:changeName en c\u00f3digo Lua personalizado. En algunos casos, el paquete reescrito podr\u00eda volverse m\u00e1s grande que la respuesta inicial e incluso exceder los 65535 bytes, lo que podr\u00eda provocar un fallo que resultar\u00eda en denegaci\u00f3n de servicio."
}
],
"id": "CVE-2026-27853",
"lastModified": "2026-07-25T10:10:00.167",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.2,
"impactScore": 3.6,
"source": "security@open-xchange.com",
"type": "Secondary"
},
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-27853",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-03-31T13:14:03.664956Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-03-31T12:16:27.917",
"references": [
{
"source": "security@open-xchange.com",
"tags": [
"Vendor Advisory"
],
"url": "https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-02.html"
}
],
"sourceIdentifier": "security@open-xchange.com",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-787"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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