{"answers":{"affected":"4 open source packages ship an affected version, including io.netty:netty-handler-proxy. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42578 exists.","fix":"Upgrade io.netty:netty-handler-proxy to a fixed version for your release line: 4.1.133.Final or 4.2.13.Final.","what":"CVE-2026-42578 is a low-severity vulnerability in Netty Netty, published on 13 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-42578 and fix it if it is affected.\n\nWhat it is: CVE-2026-42578 is a low-severity vulnerability in Netty Netty, published on 13 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42578 exists.\n\nAffected packages and fixed versions:\n- io.netty:netty-handler-proxy (Maven): affected all versions; fixed in 4.1.133.Final\n- io.netty:netty-handler-proxy (Maven): affected all versions; fixed in 4.1.133.Final\n- io.netty:netty-handler-proxy (Maven): affected from 4.2.0.Alpha1; fixed in 4.2.13.Final\n- io.netty:netty-handler-proxy (Maven): affected from 4.2.0.Alpha1; fixed in 4.2.13.Final\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-42578/ (Markdown: https://insights.sbomify.com/CVE-2026-42578/index.md)","id":"CVE-2026-42578","markdown":"https://insights.sbomify.com/CVE-2026-42578/index.md","name":"CVE-2026-42578","record":{"aliases":["CLEANSTART-2026-AX30429","CLEANSTART-2026-BZ01230","CLEANSTART-2026-KM45055","CLEANSTART-2026-UR63455","DEBIAN-CVE-2026-42578","ECHO-46e7-3ee7-0488","GHSA-45q3-82m4-75jr","MINI-2c9m-98r6-2p9v","MINI-2gp6-h97g-4q2p","MINI-3fvw-3h8q-8w7w","MINI-456c-6prg-9f5p","MINI-4qwv-m4jj-x4r5","MINI-5fxw-frq7-ffrv","MINI-5r4g-wgjv-7wmc","MINI-6688-qxp4-295r","MINI-6f25-293g-rc26","MINI-6mv2-47g2-rm7w","MINI-72j3-25vp-hpg4","MINI-7cwh-pq95-9vrm","MINI-7m7f-jjqf-xp7q","MINI-7mxr-jf65-57mr","MINI-7vw9-w3c7-cj89","MINI-7x4g-5v8j-fgw2","MINI-85r2-q84q-7h7p","MINI-89x3-qp29-557q","MINI-8fj3-58j6-xxhp","MINI-8w2h-73gx-3gxj","MINI-8w37-3cpj-56xw","MINI-9g4f-4f25-qvgx","MINI-9jpr-2h7w-82j8","MINI-9phv-wcww-6f25","MINI-9xqf-v38h-hpm3","MINI-c8mf-3jc8-3w9q","MINI-ch4c-r29w-87wj","MINI-cqm3-jjx3-v6rq","MINI-cw4h-66mg-7qrm","MINI-f57x-fq37-gxpv","MINI-f8jw-hj34-27rp","MINI-h5p4-4wrr-pgjf","MINI-h7fm-mv3m-v72w","MINI-hfr4-vjj4-75q2","MINI-hg2m-vfhj-jw57","MINI-hxg4-67hr-h722","MINI-hxxq-4fvr-h847","MINI-j4v9-59p8-7hv5","MINI-j5r4-jghv-423w","MINI-j78j-75hg-6cj6","MINI-jc25-pmgv-5ch4","MINI-jcg7-w46m-29vm","MINI-jfp9-6jg5-2c46","MINI-jpvv-7xm9-38jp","MINI-m9x9-69qv-7rwg","MINI-mh56-gwgw-6v2c","MINI-mqrm-rm9w-2c85","MINI-p32r-h5vg-7rjg","MINI-p582-8c9q-m453","MINI-p7qg-3jxp-rv9c","MINI-pch8-jpq6-5924","MINI-ppr2-5w2r-qc33","MINI-q2q7-p6v9-23r3","MINI-q49m-6395-cpj9","MINI-q7r2-8f45-rjpv","MINI-qr46-jgfq-x56h","MINI-r5g4-p7cj-rj4r","MINI-r7v6-mj4x-mfg5","MINI-rm2x-pf4h-jm9p","MINI-rm7f-rqhr-rf6r","MINI-v4rg-8j2r-m989","MINI-vjm2-cxqf-282r","MINI-vmg8-j3wr-wpfj","MINI-vmvg-hgrf-pjpx","MINI-wghq-m72w-2j56","MINI-wqvj-m7hc-r778","MINI-x24h-4f37-4f3g","MINI-x354-f623-5hjg","MINI-x6vm-cc2p-f3cc","MINI-x986-62vr-g876","MINI-xcfq-5vpp-7qch","MINI-xfcg-585v-rmxm","MINI-xfjr-m3qr-795p","MINI-xgjj-294r-2jwg","MINI-xgrr-hh2f-p929","MINI-xq2v-mr5f-cjj7","MINI-xvw2-5fww-935h","MINI-xwqh-w5hr-9mq2","RHLW-2026-05e60f2154dee59a","ROOT-APP-MAVEN-CVE-2026-42578","UBUNTU-CVE-2026-42578"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_modify","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Netty network framework","requires_auth":"none","summary":"Attackers can inject arbitrary HTTP headers into CONNECT requests via Netty's HttpProxyHandler due to disabled validation, potentially bypassing proxy security controls.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"netty","vendor":"netty"}],"cvss":{"score":2.9,"severity":"low","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P","version":"4.0"},"cwes":[{"id":"CWE-93","name":"Improper Neutralization of CRLF Sequences"},{"id":"CWE-113","name":"Improper Neutralization of CRLF Sequences in HTTP Headers"}],"description":"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.","ecosystems":["Maven"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Netty: HTTP Header Injection via HttpProxyHandler Disabled Validation","id":"CVE-2026-42578","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":"netty:netty","products":["netty:netty"],"type":"other","year":"2026"},"n_packages":4,"n_references":1,"next":{"headline":"Netty: DNS Codec Input Validation Bypass in Netty (Encoder + Decoder)","id":"CVE-2026-42579"},"packages":[{"ecosystem":"Maven","fixed":["4.1.133.Final"],"introduced":["0"],"last_affected":[],"package":"io.netty:netty-handler-proxy","purl":null,"source":"GHSA-45q3-82m4-75jr"},{"ecosystem":"Maven","fixed":["4.1.133.Final"],"introduced":["0"],"last_affected":[],"package":"io.netty:netty-handler-proxy","purl":"pkg:maven/io.netty/netty-handler-proxy","source":"GHSA-45q3-82m4-75jr"},{"ecosystem":"Maven","fixed":["4.2.13.Final"],"introduced":["4.2.0.Alpha1"],"last_affected":[],"package":"io.netty:netty-handler-proxy","purl":null,"source":"GHSA-45q3-82m4-75jr"},{"ecosystem":"Maven","fixed":["4.2.13.Final"],"introduced":["4.2.0.Alpha1"],"last_affected":[],"package":"io.netty:netty-handler-proxy","purl":"pkg:maven/io.netty/netty-handler-proxy","source":"GHSA-45q3-82m4-75jr"}],"prev":{"headline":"Netty: epoll transport denial of service via RST on half-closed TCP connection","id":"CVE-2026-42577"},"products":["netty"],"published":"2026-05-13","related":[{"cvss_score":9.1,"headline":"Netty: SNI Routing Bypass via Fragmented TLS ClientHello Causing Fallback to Default SslContext","id":"CVE-2026-75595","kev_date_added":null,"published":"2026-08-19"},{"cvss_score":8.7,"headline":"Netty: Fragmented ClientHello records trigger quadratic pre-handshake reassembly in default SNI parsing","id":"CVE-2026-75596","kev_date_added":null,"published":"2026-08-19"},{"cvss_score":8.7,"headline":"Netty Bzip2Decoder: Infinite Loop in RLE State Machine Leads to Event-Loop Thread Hang","id":"CVE-2026-59901","kev_date_added":null,"published":"2026-07-29"},{"cvss_score":8.7,"headline":"Netty codec-haproxy: Signed-Byte Sentinel Collision in HAProxyMessageDecoder Leads to Unbounded Memory Exhaustion","id":"CVE-2026-55851","kev_date_added":null,"published":"2026-07-21"},{"cvss_score":8.7,"headline":"Netty SpdyHttpDecoder: ByteBuf Reference Leak on RST_STREAM Leads to Native Memory Exhaustion","id":"CVE-2026-56745","kev_date_added":null,"published":"2026-07-21"},{"cvss_score":8.7,"headline":"Netty Vulnerable to DNS Cache Poisoning via Missing Bailiwick Checks in CNAME Records","id":"CVE-2026-45674","kev_date_added":null,"published":"2026-06-12"},{"cvss_score":8.7,"headline":"Netty has Insufficient Bailiwick Validation for NS Records","id":"CVE-2026-47691","kev_date_added":null,"published":"2026-06-12"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-18","vendors":["netty"]},"summary":"Attackers can inject arbitrary HTTP headers into CONNECT requests via Netty's HttpProxyHandler due to disabled validation, potentially bypassing proxy security controls.","url":"https://insights.sbomify.com/CVE-2026-42578/"}