{"id":"CVE-2026-45673","aliases":["GHSA-xmv7-r254-6q78"],"url":"https://o3.security/vulnerability/CVE-2026-45673","summary":"Netty: DNS Cache Poisoning due to Predictable PRNG and Default Static Source Port","details":"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.","published":"2026-06-12T14:16:03.968Z","modified":"2026-08-12T03:51:12.452590124Z","cvss":{"score":6.8,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N"},"epss":{"score":0.00256,"percentile":0.16842,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"io.netty:netty-resolver-dns","fixedVersion":"4.2.15.Final"},{"ecosystem":"Maven","name":"io.netty:netty-resolver-dns","fixedVersion":"4.1.135.Final"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/netty/netty/releases/tag/netty-4.1.135.Final"},{"type":"WEB","url":"https://github.com/netty/netty/releases/tag/netty-4.2.15.Final"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45673.json"},{"type":"ADVISORY","url":"https://github.com/netty/netty/security/advisories/GHSA-xmv7-r254-6q78"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45673"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:12.452590124Z"}}