{"id":"CVE-2026-42578","summary":"Netty: HTTP Header Injection via HttpProxyHandler Disabled Validation","details":"Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's HttpProxyHandler constructs HTTP CONNECT requests with header validation explicitly disabled. The newInitialMessage() method creates headers using DefaultHttpHeadersFactory.headersFactory().withValidation(false), then adds user-provided outboundHeaders without any CRLF validation. This allows an attacker who can influence the outbound headers to inject arbitrary HTTP headers into the CONNECT request sent to the proxy server. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.","aliases":["GHSA-45q3-82m4-75jr"],"modified":"2026-07-23T03:56:26.869435011Z","published":"2026-05-13T17:57:43.538Z","related":["CGA-98wx-9v73-38rv","SUSE-SU-2026:2308-1","openSUSE-SU-2026:10795-1"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-113"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42578.json"},"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42578.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:23808"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24502"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:25123"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:28010"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36820"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:37390"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:42644"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-42578"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42578.json"},{"type":"ADVISORY","url":"https://github.com/netty/netty/security/advisories/GHSA-45q3-82m4-75jr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42578"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2477226"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/netty/netty","events":[{"introduced":"0"},{"fixed":"fb13125f135ab53203513ff603872a3abe84d38d"},{"introduced":"09e64d259c99be8b5b2a471a78f11e65eb82598a"},{"fixed":"b3844c8108b42f68d56144b36d4d1ed96078a688"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"4.1.133"},{"introduced":"4.2.0"},{"fixed":"4.2.13"}],"source":"CPE_RANGE","cpe":"cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*"}}],"versions":["netty-4.2.12.Final","netty-4.1.132.Final","netty-4.2.11.Final","netty-4.1.131.Final","netty-4.2.10.Final","netty-4.2.9.Final","netty-4.1.130.Final","netty-4.2.8.Final","netty-4.1.129.Final","netty-4.1.128.Final","netty-4.2.7.Final","netty-4.2.6.Final","netty-4.1.127.Final","netty-4.2.5.Final","netty-4.1.126.Final","netty-4.1.125.Final","netty-4.2.4.Final","netty-4.1.124.Final","netty-4.1.123.Final","netty-4.2.3.Final","netty-4.2.2.Final","netty-4.1.122.Final","netty-4.2.1.Final","netty-4.1.121.Final","netty-4.1.120.Final","netty-4.2.0.Final","netty-4.1.119.Final","netty-4.1.118.Final","netty-4.1.117.Final","netty-4.1.116.Final","netty-4.1.115.Final","netty-4.1.114.Final","netty-4.1.113.Final","netty-4.1.112.Final","netty-4.1.111.Final","netty-4.1.110.Final","netty-4.1.109.Final","netty-4.1.108.Final","netty-4.1.107.Final","netty-4.1.106.Final","netty-4.1.105.Final","netty-4.1.104.Final","netty-4.1.103.Final","netty-4.1.102.Final","netty-4.1.101.Final","netty-4.1.100.Final","netty-4.1.99.Final","netty-4.1.98.Final","netty-4.1.97.Final","netty-4.1.96.Final","netty-4.1.95.Final","netty-4.1.94.Final","netty-4.1.93.Final","netty-4.1.92.Final","netty-4.1.91.Final","netty-4.1.90.Final","netty-4.1.89.Final","netty-4.1.88.Final","netty-4.1.87.Final","netty-4.1.86.Final","netty-4.1.85.Final","netty-4.1.84.Final","netty-4.1.83.Final","netty-4.1.82.Final","netty-4.1.81.Final","netty-4.1.80.Final","netty-4.1.79.Final","netty-4.1.78.Final","netty-4.1.77.Final","netty-4.1.76.Final","netty-4.1.75.Final","netty-4.1.74.Final","netty-4.1.73.Final","netty-4.1.72.Final","netty-4.1.71.Final","netty-4.1.70.Final","netty-4.1.69.Final","netty-4.1.68.Final","netty-4.1.67.Final","netty-4.1.66.Final","netty-4.1.65.Final","netty-4.1.64.Final","netty-4.1.63.Final","netty-4.1.62.Final","netty-4.1.61.Final","netty-4.1.60.Final","netty-4.1.59.Final","netty-4.1.58.Final","netty-4.1.57.Final","netty-4.1.56.Final","netty-4.1.55.Final","netty-4.1.54.Final","netty-4.1.53.Final","netty-4.1.52.Final","netty-4.1.51.Final","netty-4.1.50.Final","netty-4.1.49.Final","netty-4.1.48.Final","netty-4.1.47.Final","netty-4.1.46.Final","netty-4.1.45.Final","netty-4.1.44.Final","netty-4.1.43.Final","netty-4.1.42.Final","netty-4.1.41.Final","netty-4.1.40.Final","netty-4.1.39.Final","netty-4.1.38.Final","netty-4.1.37.Final","netty-4.1.36.Final","netty-4.1.35.Final","netty-4.1.34.Final","netty-4.1.33.Final","netty-4.1.32.Final","netty-4.1.31.Final","netty-4.1.30.Final","netty-4.1.29.Final","netty-4.1.28.Final","netty-4.1.27.Final","netty-4.1.26.Final","netty-4.1.25.Final","netty-4.1.24.Final","netty-4.1.23.Final","netty-4.1.22.Final","netty-4.1.21.Final","netty-4.1.20.Final","netty-4.1.19.Final","netty-4.1.18.Final","netty-4.1.17.Final","netty-4.1.16.Final","netty-4.1.15.Final","netty-4.1.14.Final","netty-4.1.13.Final","netty-4.1.12.Final","netty-4.1.11.Final","netty-4.1.10.Final","netty-4.1.9.Final","netty-4.1.8.Final","netty-4.1.7.Final","netty-4.1.6.Final","netty-4.1.5.Final","netty-4.1.4.Final","netty-4.1.3.Final","netty-4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