High
dnsdist — security advisory
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.
- Products
- dnsdist
- Affected versions
- 1.0.0~alpha2-1, 1.2.0-1, 1.2.0-3, 1.2.1-1, 1.2.1-1build1, 1.2.1-1ubuntu0.1~esm1, 1.4.0-1, 1.4.0-1build1, 1.4.0-1build2, 1.4.0-1ubuntu0.1~esm1, 1.4.0~rc3-1, 1.5.1-3build2, 1.6.1-1build1, 1.6.1-1ubuntu0.1~esm1, 1.6.1-1ubuntu0.1~esm2, 1.8.0-1, 1.8.2-1, 1.8.2-2, 1.8.2-3, 1.8.3-1, 1.8.3-2, 1.8.3-2build1, 1.8.3-2build2, 1.8.3-2ubuntu0.1~esm1, 1.9.10-1, 1.9.10-1ubuntu0.1, 1.9.8-1, 2.0.1-1, 2.0.2-1, 2.0.2-1build1, 2.0.5-2ubuntu1, 2.0.5-2ubuntu3
- Fixed versions
- Not specified
- CVEs
- CVE-2026-27853
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:58 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-27853
dnsdist
Fixed versions: Not specified
dnsdist
Fixed versions: Not specified
dnsdist
Fixed versions: Not specified
dnsdist
Fixed versions: Not specified
dnsdist
Fixed versions: Not specified
dnsdist
Fixed versions: Not specified
dnsdist
Fixed versions: Not specified
dnsdist
Fixed versions: Not specified
Complete source record
{
"id": "c6fe92946a360db458118eefe0d396e578b15dbbe7b7e34a59fdc92de7b48567",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-27853",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-27853",
"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.",
"evidence": "osv:UBUNTU-CVE-2026-27853",
"products": [
{
"name": {
"value": "dnsdist",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.0.0~alpha2-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "dnsdist",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.2.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.2.0-3",
"evidence": "/affected/1/versions"
},
{
"value": "1.2.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.2.1-1build1",
"evidence": "/affected/1/versions"
},
{
"value": "1.2.1-1ubuntu0.1~esm1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "dnsdist",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.4.0~rc3-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.0-1build1",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.0-1build2",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.0-1ubuntu0.1~esm1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "dnsdist",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.5.1-3build2",
"evidence": "/affected/3/versions"
},
{
"value": "1.6.1-1build1",
"evidence": "/affected/3/versions"
},
{
"value": "1.6.1-1ubuntu0.1~esm1",
"evidence": "/affected/3/versions"
},
{
"value": "1.6.1-1ubuntu0.1~esm2",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "dnsdist",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.8.0-1",
"evidence": "/affected/4/versions"
},
{
"value": "1.8.2-1",
"evidence": "/affected/4/versions"
},
{
"value": "1.8.2-2",
"evidence": "/affected/4/versions"
},
{
"value": "1.8.2-3",
"evidence": "/affected/4/versions"
},
{
"value": "1.8.3-1",
"evidence": "/affected/4/versions"
},
{
"value": "1.8.3-2",
"evidence": "/affected/4/versions"
},
{
"value": "1.8.3-2build1",
"evidence": "/affected/4/versions"
},
{
"value": "1.8.3-2build2",
"evidence": "/affected/4/versions"
},
{
"value": "1.8.3-2ubuntu0.1~esm1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "dnsdist",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.9.8-1",
"evidence": "/affected/5/versions"
},
{
"value": "1.9.10-1",
"evidence": "/affected/5/versions"
},
{
"value": "1.9.10-1ubuntu0.1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "dnsdist",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.0.2-1build1",
"evidence": "/affected/6/versions"
},
{
"value": "2.0.5-2ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "2.0.5-2ubuntu3",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "dnsdist",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.9.10-1",
"evidence": "/affected/7/versions"
},
{
"value": "2.0.1-1",
"evidence": "/affected/7/versions"
},
{
"value": "2.0.2-1",
"evidence": "/affected/7/versions"
},
{
"value": "2.0.2-1build1",
"evidence": "/affected/7/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-27853",
"aliases": [
"UBUNTU-CVE-2026-27853"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "dnsdist",
"purl": "pkg:deb/ubuntu/dnsdist?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"1.0.0~alpha2-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27853.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "dnsdist",
"binary_version": "1.0.0~alpha2-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "dnsdist",
"purl": "pkg:deb/ubuntu/dnsdist?arch=source&distro=esm-apps%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"1.2.0-1",
"1.2.0-3",
"1.2.1-1",
"1.2.1-1build1",
"1.2.1-1ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27853.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "dnsdist",
"binary_version": "1.2.1-1ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "dnsdist",
"purl": "pkg:deb/ubuntu/dnsdist?arch=source&distro=esm-apps%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"1.4.0~rc3-1",
"1.4.0-1",
"1.4.0-1build1",
"1.4.0-1build2",
"1.4.0-1ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27853.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "dnsdist",
"binary_version": "1.4.0-1ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "dnsdist",
"purl": "pkg:deb/ubuntu/dnsdist?arch=source&distro=esm-apps%2Fjammy",
"ecosystem": "Ubuntu:Pro:22.04:LTS"
},
"versions": [
"1.5.1-3build2",
"1.6.1-1build1",
"1.6.1-1ubuntu0.1~esm1",
"1.6.1-1ubuntu0.1~esm2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27853.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "dnsdist",
"binary_version": "1.6.1-1ubuntu0.1~esm2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "dnsdist",
"purl": "pkg:deb/ubuntu/dnsdist?arch=source&distro=esm-apps%2Fnoble",
"ecosystem": "Ubuntu:Pro:24.04:LTS"
},
"versions": [
"1.8.0-1",
"1.8.2-1",
"1.8.2-2",
"1.8.2-3",
"1.8.3-1",
"1.8.3-2",
"1.8.3-2build1",
"1.8.3-2build2",
"1.8.3-2ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27853.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "dnsdist",
"binary_version": "1.8.3-2ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "dnsdist",
"purl": "pkg:deb/ubuntu/dnsdist?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"1.9.8-1",
"1.9.10-1",
"1.9.10-1ubuntu0.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27853.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "dnsdist",
"binary_version": "1.9.10-1ubuntu0.1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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"introduced": "0"
}
]
}
],
"package": {
"name": "dnsdist",
"purl": "pkg:deb/ubuntu/dnsdist?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"2.0.2-1build1",
"2.0.5-2ubuntu1",
"2.0.5-2ubuntu3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27853.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "dnsdist",
"binary_version": "2.0.5-2ubuntu3"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "dnsdist",
"purl": "pkg:deb/ubuntu/dnsdist?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"1.9.10-1",
"2.0.1-1",
"2.0.2-1",
"2.0.2-1build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27853.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "dnsdist",
"binary_version": "2.0.2-1build1"
}
]
}
}
],
"modified": "2026-10-17T12:59:56.390296076Z",
"provider": "osv",
"upstream": [
"CVE-2026-27853"
],
"references": [
"https://ubuntu.com/security/CVE-2026-27853",
"https://www.cve.org/CVERecord?id=CVE-2026-27853",
"https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-02.html",
"https://downloads.powerdns.com/patches/2026-02/"
]
},
"related_cves": [
{
"value": "CVE-2026-27853",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 360003,
"published_at": "2026-03-31T12:16:00+00:00"
}