{"cve":"CVE-2026-44249","nvd":{"published":"2026-06-11T22:16:56.707","modified":"2026-09-18T13:18:23.463","status":"Modified","description":"Netty is a network application framework for development of protocol servers and clients. In netty-handler prior to versions 4.1.135.Final and 4.2.15.Final, an attacker can bypass IPv6 subnet rules due to an incorrect masking operation in IpSubnetFilterRule.compareTo(). Valid public IP addresses can bypass the restrictions. Versions 4.1.135.Final and 4.2.15.Final patch the issue.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.1},"cwes":["CWE-284","CWE-697","CWE-1287"],"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/netty/netty/security/advisories/GHSA-3qp7-7mw8-wx86","https://access.redhat.com/errata/RHSA-2026:26017","https://access.redhat.com/errata/RHSA-2026:26018"],"products":["netty:netty"],"source":"nvd","synced_at":"2026-10-19T22:38:48.522727527+00:00"},"epss":{"cve":"CVE-2026-44249","score":0.00987,"percentile":0.62427,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-3qp7-7mw8-wx86","url":"https://osv.dev/vulnerability/GHSA-3qp7-7mw8-wx86","summary":"Netty has an IPv6 Subnet Filter Bypass via Incorrect Comparator Masking","modified":"2026-09-10T03:50:55.436123619Z","packages":[{"ecosystem":"Maven","name":"io.netty:netty-handler","purl":"pkg:maven/io.netty/netty-handler","ranges":[">=4.2.0.Final <4.2.15.Final"],"fixed":["4.2.15.Final"]},{"ecosystem":"Maven","name":"io.netty:netty-handler","purl":"pkg:maven/io.netty/netty-handler","ranges":["<4.1.135.Final"],"fixed":["4.1.135.Final"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}