{"answers":{"affected":"4 open source packages ship an affected version, including io.netty:netty-codec-http. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-50020 exists.","fix":"Upgrade io.netty:netty-codec-http to a fixed version for your release line: 4.1.135.Final or 4.2.15.Final.","what":"CVE-2026-50020 is a medium-severity vulnerability in Netty Netty, published on 12 Jun 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-2026-50020 and fix it if it is affected.\n\nWhat it is: CVE-2026-50020 is a medium-severity vulnerability in Netty Netty, published on 12 Jun 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-2026-50020 exists.\n\nAffected packages and fixed versions:\n- io.netty:netty-codec-http (Maven): affected all versions; fixed in 4.1.135.Final\n- io.netty:netty-codec-http (Maven): affected all versions; fixed in 4.1.135.Final\n- io.netty:netty-codec-http (Maven): affected from 4.2.0.Final; fixed in 4.2.15.Final\n- io.netty:netty-codec-http (Maven): affected from 4.2.0.Final; fixed in 4.2.15.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-2026-50020/ (Markdown: https://insights.sbomify.com/CVE-2026-50020/index.md)","id":"CVE-2026-50020","markdown":"https://insights.sbomify.com/CVE-2026-50020/index.md","name":"CVE-2026-50020","record":{"aliases":["CLEANSTART-2026-FQ42724","CLEANSTART-2026-NT22558","CLEANSTART-2026-QB68798","CLEANSTART-2026-VO96639","CLEANSTART-2026-YX18687","DEBIAN-CVE-2026-50020","ECHO-1d7b-3200-5631","GHSA-hvcg-qmg6-jm4c","MINI-29pm-3f8r-m4jh","MINI-2rjp-5c8x-chxr","MINI-32ff-2vpg-52fh","MINI-34g9-38q8-fwq5","MINI-376p-pfm9-63mr","MINI-3c34-w98q-4c22","MINI-3frq-2fv4-jpfj","MINI-3h98-846q-qrpm","MINI-3v85-845h-f25j","MINI-3x3p-w7x2-jg7r","MINI-43vp-jfm4-vc3r","MINI-4vpm-976g-2gq4","MINI-5753-g766-p348","MINI-59qh-7m5h-c5gm","MINI-5mf8-qpvj-3mp8","MINI-6643-cm4c-php8","MINI-6j7w-62p9-4qm5","MINI-6rf4-5cx8-mqj9","MINI-6wc9-xxh3-cc8j","MINI-75m9-2jx5-x55r","MINI-7fj6-crm8-f88c","MINI-7mp7-gf6w-g9cm","MINI-7p2x-pgw9-8wqp","MINI-7p5q-2rx6-v374","MINI-8g66-h5hq-gg25","MINI-8mcw-2796-vch6","MINI-8rr9-xph5-7gfq","MINI-8xqw-q526-mqqc","MINI-9358-c262-63rw","MINI-97p6-w37c-6hw2","MINI-98f9-pppr-p252","MINI-9g3p-fp5m-phh7","MINI-9qjr-f994-wwqc","MINI-9rcq-fffq-8m9q","MINI-c65h-h3f4-j222","MINI-c73x-7f4p-f528","MINI-c7c2-c824-v4hx","MINI-cvjw-5pf2-m3c9","MINI-cw86-3p26-m9hp","MINI-f5vh-2pw6-xhvf","MINI-fp43-vcwj-xx7g","MINI-fx32-6xr9-8gfw","MINI-gff6-vm8q-mp46","MINI-gqvr-26vc-c5hc","MINI-grrj-w4rm-rw8r","MINI-gwpg-r47h-2qmm","MINI-h72h-q79c-p4qf","MINI-hhmm-2vfm-587h","MINI-hmg8-xhq2-7r2m","MINI-hv64-mm2q-c683","MINI-hx4v-r2rv-5fc9","MINI-hxm2-3wq8-3875","MINI-j6qq-gv4r-67g4","MINI-jfh3-jmm8-fmwf","MINI-jg33-4292-8pp6","MINI-jg77-rv3f-fj9j","MINI-jr2g-fg2p-37vg","MINI-mch9-6c52-39w9","MINI-mm9f-x364-fgf3","MINI-p38f-vhpx-qwwv","MINI-p4qc-fmj6-q8mc","MINI-pg3c-rfjh-25r5","MINI-pgr4-prr8-ghwh","MINI-pmqq-9ccm-r37w","MINI-pr99-3j9f-7jq6","MINI-pvwh-596m-9gqc","MINI-q572-c6x6-wpjg","MINI-q948-x563-rqhx","MINI-q9wq-2v7m-jx4m","MINI-qrc2-mgq7-67hg","MINI-r4gv-rppj-5483","MINI-r655-h8w5-227x","MINI-r9qc-6q7c-r6mx","MINI-rc7m-46c7-6rgj","MINI-rhjp-32hq-9gcv","MINI-rw6q-p34w-ww68","MINI-rxpr-3fcp-8vh7","MINI-v54j-g789-9r3x","MINI-v9xg-79j5-52r3","MINI-vchq-f4m8-9wrc","MINI-vr67-q57c-pf6h","MINI-w5jj-g7q5-68v3","MINI-wr2f-phcv-wq2p","MINI-wrhg-374g-8637","MINI-wx25-v79r-42p7","MINI-wxq8-r2m9-pqq5","MINI-x7j8-jfvh-phw9","MINI-xc2g-4pjr-cv62","MINI-xgf2-hcrv-jffw","MINI-xh8p-54x6-2gwf","MINI-xmc8-9vw6-m68h","MINI-xmhr-8hh2-x7w2","ROOT-APP-MAVEN-CVE-2026-50020","UBUNTU-CVE-2026-50020"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Netty network framework","requires_auth":"none","summary":"Netty's HTTP decoder improperly skips non-CRLF control characters, enabling request-boundary confusion in pipelined or multiplexed transports.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"netty","vendor":"netty"}],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-444","name":"Inconsistent Interpretation of HTTP Requests"}],"description":"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, before reading the first request-line, `HttpObjectDecoder` skips every byte for which `Character.isISOControl(b)` is `true` (0x00–0x1F and 0x7F) as well as all whitespace. RFC 9112 §2.2 only asks servers to ignore empty CRLF lines preceding the request-line — a carefully scoped robustness allowance intended to handle HTTP/1.0 POST workarounds. Silently absorbing NUL bytes, SOH, STX, and other non-CRLF control characters goes significantly beyond this, and can be exploited for request-boundary confusion in pipelined or multiplexed transports where a front-end component treats those bytes differently. Versions 4.1.135.Final and 4.2.15.Final patch the issue.","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's HttpObjectDecoder skips arbitrary initial control characters when only initial CRLF characters are permitted","id":"CVE-2026-50020","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":"netty:netty","products":["netty:netty"],"type":"other","year":"2026"},"n_packages":4,"n_references":3,"next":{"headline":"pnpm: Integrity Check Bypass via Missing Lockfile Integrity Field","id":"CVE-2026-50021"},"packages":[{"ecosystem":"Maven","fixed":["4.1.135.Final"],"introduced":["0"],"last_affected":[],"package":"io.netty:netty-codec-http","purl":null,"source":"GHSA-hvcg-qmg6-jm4c"},{"ecosystem":"Maven","fixed":["4.1.135.Final"],"introduced":["0"],"last_affected":[],"package":"io.netty:netty-codec-http","purl":"pkg:maven/io.netty/netty-codec-http","source":"GHSA-hvcg-qmg6-jm4c"},{"ecosystem":"Maven","fixed":["4.2.15.Final"],"introduced":["4.2.0.Final"],"last_affected":[],"package":"io.netty:netty-codec-http","purl":null,"source":"GHSA-hvcg-qmg6-jm4c"},{"ecosystem":"Maven","fixed":["4.2.15.Final"],"introduced":["4.2.0.Final"],"last_affected":[],"package":"io.netty:netty-codec-http","purl":"pkg:maven/io.netty/netty-codec-http","source":"GHSA-hvcg-qmg6-jm4c"}],"prev":{"headline":"yt-dlp: File Downloader cookie leak with curl","id":"CVE-2026-50019"},"products":["netty"],"published":"2026-06-12","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":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-06-12","vendors":["netty"]},"summary":"Netty's HTTP decoder improperly skips non-CRLF control characters, enabling request-boundary confusion in pipelined or multiplexed transports.","url":"https://insights.sbomify.com/CVE-2026-50020/"}