DEBIAN-CVE-2026-47691
Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty's `DnsResolveContext` insufficiently validates the bailiwick of NS records, enabling DNS Cache Poisoning. An attacker controlling an authoritative name server for a subdomain can poison the cache for parent domains (like `.co.uk`). In `io.netty.resolver.dns.DnsResolveContext.AuthoritativeNameServerList#add` method accepts any NS record from the AUTHORITY section as long as the record's name is a suffix of the questionName. Subsequently, the `handleWithAdditional` method caches the associated A records from the ADDITIONAL section directly into the `authoritativeDnsServerCache` under the parent domain's key. This bypasses standard bailiwick rules, where a server authoritative for a subdomain should not be trusted to provide authoritative records for its parent. The poisoned cache is then used for all future resolutions under the parent domain's key. Versions 4.1.135.Final and 4.2.15.Final patch the issue.
DEBIAN-CVE-2026-47691
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-47691
netty
Source reference: /affected/0/package/name
- Affected versions
- 1:4.1.48-10
Source reference:
/affected/0/versions1:4.1.48-11Source reference:
/affected/0/versions1:4.1.48-12Source reference:
/affected/0/versions1:4.1.48-13Source reference:
/affected/0/versions1:4.1.48-14Source reference:
/affected/0/versions1:4.1.48-15Source reference:
/affected/0/versions1:4.1.48-16Source reference:
/affected/0/versions1:4.1.48-7Source reference:
/affected/0/versions1:4.1.48-7+deb12u1Source reference:
/affected/0/versions1:4.1.48-7+deb12u2Source reference:
/affected/0/versions1:4.1.48-8Source reference:
/affected/0/versions1:4.1.48-9Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
netty
Source reference: /affected/1/package/name
- Affected versions
- 1:4.1.48-10
Source reference:
/affected/1/versions1:4.1.48-10+deb13u1Source reference:
/affected/1/versions1:4.1.48-11Source reference:
/affected/1/versions1:4.1.48-12Source reference:
/affected/1/versions1:4.1.48-13Source reference:
/affected/1/versions1:4.1.48-14Source reference:
/affected/1/versions1:4.1.48-15Source reference:
/affected/1/versions1:4.1.48-16Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
netty
Source reference: /affected/2/package/name
- Affected versions
- 1:4.1.48-10
Source reference:
/affected/2/versions1:4.1.48-11Source reference:
/affected/2/versions1:4.1.48-12Source reference:
/affected/2/versions1:4.1.48-13Source reference:
/affected/2/versions1:4.1.48-14Source reference:
/affected/2/versions1:4.1.48-15Source reference:
/affected/2/versions1:4.1.48-16Source reference:
/affected/2/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "netty",
"purl": "pkg:deb/debian/netty?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1:4.1.48-10",
"1:4.1.48-11",
"1:4.1.48-12",
"1:4.1.48-13",
"1:4.1.48-14",
"1:4.1.48-15",
"1:4.1.48-16",
"1:4.1.48-7",
"1:4.1.48-7+deb12u1",
"1:4.1.48-7+deb12u2",
"1:4.1.48-8",
"1:4.1.48-9"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-47691.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "netty",
"purl": "pkg:deb/debian/netty?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1:4.1.48-10",
"1:4.1.48-10+deb13u1",
"1:4.1.48-11",
"1:4.1.48-12",
"1:4.1.48-13",
"1:4.1.48-14",
"1:4.1.48-15",
"1:4.1.48-16"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-47691.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "netty",
"purl": "pkg:deb/debian/netty?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1:4.1.48-10",
"1:4.1.48-11",
"1:4.1.48-12",
"1:4.1.48-13",
"1:4.1.48-14",
"1:4.1.48-15",
"1:4.1.48-16"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-47691.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57150 · Revision 1
- Added to Heist Feed
- Publisher date