Medium
Netty: DNS Cache Poisoning due to Predictable PRNG and Default Static Source Port
Type: advisorySources: OSV
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 DNS resolver uses a predictable PRNG for generating DNS transaction IDs and defaults to a static UDP source port. This combination reduces the entropy of DNS queries, enabling DNS Cache Poisoning (Kaminsky attack). Versions 4.1.135.Final and 4.2.15.Final patch the issue.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-45673
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 15:51 UTC · Revision 1
Source evidence
Netty: DNS Cache Poisoning due to Predictable PRNG and Default Static Source Port
core-osv · Original sourcePublished 12 Jun 2026, 14:16 UTC
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 DNS resolver uses a predictable PRNG for generating DNS transaction IDs and defaults to a static UDP source port. This combination reduces the entropy of DNS queries, enabling DNS Cache Poisoning (Kaminsky attack). Versions 4.1.135.Final and 4.2.15.Final patch the issue.
osv:CVE-2026-45673
Complete source record
{
"id": "e985d1e1085c773c6b24d5f50dcd7a974bec99e8b6e8ca188f34cb52aba2b02a",
"url": "https://osv.dev/vulnerability/CVE-2026-45673",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Netty: DNS Cache Poisoning due to Predictable PRNG and Default Static Source Port",
"summary": "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 DNS resolver uses a predictable PRNG for generating DNS transaction IDs and defaults to a static UDP source port. This combination reduces the entropy of DNS queries, enabling DNS Cache Poisoning (Kaminsky attack). Versions 4.1.135.Final and 4.2.15.Final patch the issue.",
"evidence": "osv:CVE-2026-45673",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-45673",
"aliases": [
"CVE-2026-45673",
"GHSA-xmv7-r254-6q78"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/netty/netty",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "f05f765d81460799c53123a207f665bf3b465171"
},
{
"introduced": "09e64d259c99be8b5b2a471a78f11e65eb82598a"
},
{
"fixed": "a41f7b289ce1d697c50846f3ade3983e22b2ed40"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "4.1.135"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.2.0"
},
{
"fixed": "4.2.15"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "f05f765d81460799c53123a207f665bf3b465171"
}
],
"source": "REFERENCES_TAG",
"original_tag": "netty-4.1.135.Final"
},
{
"range": [
{
"fixed": "a41f7b289ce1d697c50846f3ade3983e22b2ed40"
}
],
"source": "REFERENCES_TAG",
"original_tag": "netty-4.2.15.Final"
}
]
}
}
],
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45673.json"
}
}
],
"modified": "2026-10-28T02:30:30.329918729Z",
"provider": "osv",
"references": [
"https://github.com/netty/netty/releases/tag/netty-4.1.135.Final",
"https://github.com/netty/netty/releases/tag/netty-4.2.15.Final",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45673.json",
"https://github.com/netty/netty/security/advisories/GHSA-xmv7-r254-6q78",
"https://nvd.nist.gov/vuln/detail/CVE-2026-45673"
],
"provider_metadata": {
"cwe_ids": [
"CWE-330",
"CWE-340"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45673.json"
}
},
"related_cves": [
{
"value": "CVE-2026-45673",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 497014,
"published_at": "2026-06-12T14:16:03.968+00:00"
}