{"answers":{"affected":"4 open source packages ship an affected version, including io.netty:netty-codec-http2. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-59900 in the wild and no public exploit code.","fix":"Upgrade io.netty:netty-codec-http2 to a fixed version for your release line: 4.1.136.Final or 4.2.16.Final.","what":"CVE-2026-59900 is a medium-severity vulnerability in Netty Netty, published on 29 Jul 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-2026-59900 and fix it if it is affected.\n\nWhat it is: CVE-2026-59900 is a medium-severity vulnerability in Netty Netty, published on 29 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-59900 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- io.netty:netty-codec-http2 (Maven): affected all versions; fixed in 4.1.136.Final\n- io.netty:netty-codec-http2 (Maven): affected all versions; fixed in 4.1.136.Final\n- io.netty:netty-codec-http2 (Maven): affected from 4.2.0.Final; fixed in 4.2.16.Final\n- io.netty:netty-codec-http2 (Maven): affected from 4.2.0.Final; fixed in 4.2.16.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-2026-59900/ (Markdown: https://insights.sbomify.com/CVE-2026-59900/index.md)","id":"CVE-2026-59900","markdown":"https://insights.sbomify.com/CVE-2026-59900/index.md","name":"CVE-2026-59900","record":{"aliases":["CLEANSTART-2026-JF33356","CLEANSTART-2026-RR39735","CLEANSTART-2026-SR05479","CLEANSTART-2026-VS28854","CLEANSTART-2026-ZF06834","DEBIAN-CVE-2026-59900","ECHO-d8b8-66c5-a967","GHSA-c69g-56f8-xwqj","MINI-2389-47c3-v6mh","MINI-25cc-pccj-296v","MINI-2cvg-2pfm-g4cr","MINI-2h24-mj72-3hqj","MINI-2j5g-734v-gv3h","MINI-2m4j-4w9v-28hm","MINI-2pf7-q6c4-7h37","MINI-2v79-2m69-q5f6","MINI-2vqx-j5px-q375","MINI-2x4q-23hj-p3f2","MINI-33rv-vg8q-53p8","MINI-37gj-6hfh-cprv","MINI-4595-gp33-58wc","MINI-4q33-8h83-5j39","MINI-4rqc-6x4j-wrxh","MINI-5693-f2j3-jg2r","MINI-584g-6cqg-rfwj","MINI-5m9v-jxj2-gqwx","MINI-5vjc-mhp5-rvf6","MINI-65jx-8mf7-5547","MINI-66jm-6367-w4r7","MINI-69pq-cpwm-xmh5","MINI-6m45-8qq4-hpfc","MINI-6mpp-74g5-f7cp","MINI-6prv-fc5p-qg3f","MINI-6q6g-2wg2-5rjm","MINI-7cj7-c3h4-5vfr","MINI-7j3h-xr6j-48v6","MINI-7vj2-3gh5-qrp6","MINI-8wfj-vwvj-c4mh","MINI-934m-9735-q62x","MINI-9cwj-79cm-fx5v","MINI-9jc8-2q25-6vpc","MINI-9vfq-6grv-gj4h","MINI-9whq-7w86-g2q5","MINI-9wph-3hwc-g543","MINI-c3j9-8x74-34vh","MINI-c3wj-2p8x-6wmv","MINI-c432-r99v-246h","MINI-ccj6-wgrj-94v7","MINI-cw63-wj56-p56m","MINI-cx2x-w377-xjm8","MINI-f4jr-hfvr-xxg2","MINI-f8xq-f54c-p5x8","MINI-fgxj-7j7q-r4wf","MINI-g8p9-3xwx-vmcq","MINI-ggxf-6x7v-rwfx","MINI-gq4f-3hx8-9h23","MINI-h56m-hw2p-m54p","MINI-h6xg-6g76-h745","MINI-h95c-hxmj-p7vw","MINI-h9g4-6xrp-89p8","MINI-hhhx-m7gm-9qw4","MINI-j826-p95h-3rp2","MINI-jch2-9cw6-fx9p","MINI-jhhg-86vw-6mmg","MINI-jp5x-cv5h-4qwj","MINI-m4vq-ph24-x74j","MINI-mm33-2mgm-x3w8","MINI-mqfq-gj84-rpjw","MINI-mv3v-q2h5-hq72","MINI-p26g-w6cc-59fp","MINI-p4cp-5xcx-9cm5","MINI-p9g4-2xm6-pfx5","MINI-pfgc-58v9-cwwq","MINI-q352-gm34-fqg2","MINI-qhcq-9m77-cxv2","MINI-qhq4-rvf5-c4jv","MINI-qjq8-mxgg-6cq8","MINI-qv8p-5p48-5j34","MINI-qxcq-hpq8-x9q5","MINI-r4qp-frq6-cwvx","MINI-rc86-62cc-fh8h","MINI-rjv7-v7mp-879c","MINI-vf94-44jf-wj62","MINI-vpmv-c369-3h4h","MINI-w2jr-qfcj-m9jv","MINI-wf8h-867g-22vv","MINI-wh93-gwqp-vg7r","MINI-wpc3-8779-5cwj","MINI-wpxc-8j33-wf57","MINI-wr4x-m353-vqp4","MINI-wxrf-xjq9-72jj","MINI-xff5-3c35-85rj","MINI-xgq4-qcpp-c65p","MINI-xwv6-v7hh-rcp4","UBUNTU-CVE-2026-59900"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Netty HTTP/2 codec","requires_auth":"none","summary":"Attackers can bypass request routing controls by sending duplicate Host headers during HTTP/2 to HTTP/1.x translation in Netty.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"netty","vendor":"netty"}],"cvss":{"score":6.9,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","version":"4.0"},"cwes":[{"id":"CWE-444","name":"Inconsistent Interpretation of HTTP Requests"}],"description":"Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, Netty's HTTP/2-to-HTTP/1.x translation layer (`Http2StreamFrameToHttpObjectCodec` and `InboundHttp2ToHttpAdapter`) fails to deduplicate or validate `Host` headers when an HTTP/2 client supplies both the `:authority` pseudo-header and a literal `host` header in a single HEADERS frame. The translator maps `:authority` to `Host` and separately copies the literal `host` header, producing an `HttpRequest` object containing two `Host` headers with attacker-controlled differing values. This issue has been fixed in versions 4.1.136.Final and 4.2.16.Final.","ecosystems":["Maven"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Netty codec-http2: Lack of Host Header Deduplication in HTTP/2→HTTP/1.x Translation Leads to Request Routing Bypass","id":"CVE-2026-59900","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":"Netty Bzip2Decoder: Infinite Loop in RLE State Machine Leads to Event-Loop Thread Hang","id":"CVE-2026-59901"},"packages":[{"ecosystem":"Maven","fixed":["4.1.136.Final"],"introduced":["0"],"last_affected":[],"package":"io.netty:netty-codec-http2","purl":null,"source":"GHSA-c69g-56f8-xwqj"},{"ecosystem":"Maven","fixed":["4.1.136.Final"],"introduced":["0"],"last_affected":[],"package":"io.netty:netty-codec-http2","purl":"pkg:maven/io.netty/netty-codec-http2","source":"GHSA-c69g-56f8-xwqj"},{"ecosystem":"Maven","fixed":["4.2.16.Final"],"introduced":["4.2.0.Final"],"last_affected":[],"package":"io.netty:netty-codec-http2","purl":null,"source":"GHSA-c69g-56f8-xwqj"},{"ecosystem":"Maven","fixed":["4.2.16.Final"],"introduced":["4.2.0.Final"],"last_affected":[],"package":"io.netty:netty-codec-http2","purl":"pkg:maven/io.netty/netty-codec-http2","source":"GHSA-c69g-56f8-xwqj"}],"prev":{"headline":"Netty HttpContentEncoder: Unbounded Per-Connection Queue Growth via HTTP/1.1 Pipelining Leads to Denial of Service","id":"CVE-2026-59899"},"products":["netty"],"published":"2026-07-29","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":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-29","vendors":["netty"]},"summary":"Attackers can bypass request routing controls by sending duplicate Host headers during HTTP/2 to HTTP/1.x translation in Netty.","url":"https://insights.sbomify.com/CVE-2026-59900/"}