{"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-2026-55831 exists.","fix":"Upgrade io.netty:netty-codec-http to a fixed version for your release line: 4.1.136.Final or 4.2.16.Final.","what":"CVE-2026-55831 is a high-severity denial of service vulnerability in Netty Netty, published on 20 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-2026-55831 and fix it if it is affected.\n\nWhat it is: CVE-2026-55831 is a high-severity denial of service vulnerability in Netty Netty, published on 20 Jul 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-2026-55831 exists.\n\nAffected packages and fixed versions:\n- io.netty:netty-codec-http (Maven): affected from 4.1.0.Final; fixed in 4.1.136.Final\n- io.netty:netty-codec-http (Maven): affected from 4.1.0.Final; fixed in 4.1.136.Final\n- io.netty:netty-codec-http (Maven): affected from 4.2.0.Final; fixed in 4.2.16.Final\n- io.netty:netty-codec-http (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-2026-55831/ (Markdown: https://insights.sbomify.com/CVE-2026-55831/index.md)","id":"CVE-2026-55831","markdown":"https://insights.sbomify.com/CVE-2026-55831/index.md","name":"CVE-2026-55831","record":{"aliases":["CLEANSTART-2026-ET03364","CLEANSTART-2026-KQ89432","CLEANSTART-2026-LF32209","CLEANSTART-2026-LW60840","CLEANSTART-2026-TM34395","DEBIAN-CVE-2026-55831","ECHO-416d-167e-669f","GHSA-6jqx-86gh-f27w","MINI-2436-9h93-mj3g","MINI-29vr-x773-4rxp","MINI-2fgj-rjg5-4665","MINI-2jrr-4c5p-xrp2","MINI-2q7r-wp73-3j4h","MINI-39v6-pqwc-494f","MINI-3ghw-fgwv-pv32","MINI-3jqg-xhwr-f5cv","MINI-3mw3-v9x7-xjg9","MINI-3qxw-26qr-hjm4","MINI-4hm7-9gwg-r797","MINI-4jxj-79rg-p75m","MINI-4vjr-865j-7xgx","MINI-4wjh-qx97-c7x4","MINI-4x9c-53xv-hx3h","MINI-5368-c422-xrrm","MINI-544v-7w2q-2xwf","MINI-55pm-hf4m-8p44","MINI-56h7-fc2q-qgpj","MINI-5757-qrxg-ch7f","MINI-59fq-6fj7-g6cr","MINI-5r7g-9rc2-3582","MINI-64c4-h2wx-jc6x","MINI-6f57-4g24-3cf7","MINI-6fv2-v8fg-h9v3","MINI-6jvf-3gr6-8gg2","MINI-6xgr-r5h8-jvrc","MINI-77gp-r3h8-cvgj","MINI-79xv-9gw9-g74p","MINI-7j5q-29wg-2jff","MINI-7jm5-7fq6-pg68","MINI-7w86-7hqj-p89j","MINI-8249-fvcp-x426","MINI-82vm-2xvc-4h58","MINI-8437-m965-crg5","MINI-8f72-p3jv-fg82","MINI-8fpx-ffj3-29vw","MINI-8mpf-p5w7-4hff","MINI-8pmf-85gf-xqqx","MINI-8wm4-3g38-2gwm","MINI-9px2-5c45-xgjh","MINI-9vfr-f46h-h52w","MINI-9wpq-c7mm-r84f","MINI-9wqp-q6qm-p97x","MINI-cc5p-773j-cx49","MINI-cg82-72w2-67x4","MINI-cwc6-j6pf-f65p","MINI-cwvq-pcvh-v22p","MINI-f6j6-2958-mx6r","MINI-f8wg-7c53-6323","MINI-f99x-hcwr-5p96","MINI-fccp-rr7r-rm5m","MINI-fg45-pqm8-x9wg","MINI-frhv-fw69-8j3j","MINI-fwm6-5xv2-qpvr","MINI-g4h2-3rmc-w74q","MINI-g765-fwm9-mp4m","MINI-g94w-3mmv-222v","MINI-gjvv-gpjc-fp5h","MINI-gpx7-jr5v-gpv3","MINI-gr6q-v7pg-9f9w","MINI-h5pg-q9g3-cg8c","MINI-h9c8-mv42-c9qp","MINI-hf7r-v5xw-v5gr","MINI-hwp9-xjj4-qc3p","MINI-j5wj-2q9c-7qw9","MINI-j634-6chj-86c5","MINI-j6xm-5vvh-f84h","MINI-jjf3-wjxh-mjrm","MINI-jvfx-847p-3333","MINI-jxc8-xvjf-6x7h","MINI-m4cg-xmhc-rpw5","MINI-m695-c9jj-rw85","MINI-m7wf-xq6g-chvf","MINI-mgvg-hrhp-8wh7","MINI-mq9r-mfmf-9w9c","MINI-p9mj-g2mj-79m3","MINI-pg6g-rpxv-84w2","MINI-pp43-x643-mgm2","MINI-q5h2-j5w2-pqp2","MINI-q5v4-hq74-q6wx","MINI-qcwv-p3v5-gjcf","MINI-qf2j-54hm-9j86","MINI-qf7x-7628-5jv7","MINI-qgh6-h7v2-33gp","MINI-qxv6-gqgr-73hx","MINI-r6p2-cqh2-9m55","MINI-rc3f-mcgv-g546","MINI-rxhf-7jxc-xcgp","MINI-rxw4-9x44-hqjj","MINI-v3f4-w963-4m23","MINI-v9xc-c28c-9crv","MINI-vrwj-r654-mjp7","MINI-vwjv-3c6w-xf3r","MINI-w5r8-g734-rgwc","MINI-w8hc-f2f6-xcm3","MINI-wfcq-6m23-r3fq","MINI-wr4c-rx47-h82w","MINI-x3xc-934q-8cfm","MINI-x584-7798-x4cj","MINI-x7vv-24px-2x7r","MINI-xcq5-2x24-hqhw","MINI-xg82-29wf-qhpv","MINI-xm8j-r44q-5m25","MINI-xxf6-86gj-q6r3","ROOT-APP-MAVEN-CVE-2026-55831","UBUNTU-CVE-2026-55831"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Netty network framework","requires_auth":"none","summary":"Remote attackers can cause heap exhaustion and service disruption by sending large SPDY SETTINGS frames to applications using the Netty library.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"netty","vendor":"netty"}],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"},{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"description":"Netty is a network application framework for development of protocol servers and clients. Prior to 4.1.136.Final and 4.2.16.Final, Netty's SPDY SETTINGS decoder accepts a peer-declared SETTINGS entry count up to the 24-bit frame-length limit and materializes every unique setting ID in `DefaultSpdySettingsFrame`, allowing a remote SPDY/3.1 peer to send a syntactically valid roughly 2 MiB SETTINGS frame that creates 262144 map entries and amplifies network input into heap growth and ordered-map insertion work. This issue is 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":"weaponised"},"has_fix":true,"headline":"Netty SPDY SETTINGS frame count materializes unbounded settings map","id":"CVE-2026-55831","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":"netty:netty","products":["netty:netty"],"type":"denial_of_service","year":"2026"},"n_packages":4,"n_references":5,"next":{"headline":"Tract: Arbitrary file read via unsanitized ONNX external_data `location` (path traversal) on model load in tract-onnx","id":"CVE-2026-55832"},"packages":[{"ecosystem":"Maven","fixed":["4.1.136.Final"],"introduced":["4.1.0.Final"],"last_affected":[],"package":"io.netty:netty-codec-http","purl":null,"source":"GHSA-6jqx-86gh-f27w"},{"ecosystem":"Maven","fixed":["4.1.136.Final"],"introduced":["4.1.0.Final"],"last_affected":[],"package":"io.netty:netty-codec-http","purl":"pkg:maven/io.netty/netty-codec-http","source":"GHSA-6jqx-86gh-f27w"},{"ecosystem":"Maven","fixed":["4.2.16.Final"],"introduced":["4.2.0.Final"],"last_affected":[],"package":"io.netty:netty-codec-http","purl":null,"source":"GHSA-6jqx-86gh-f27w"},{"ecosystem":"Maven","fixed":["4.2.16.Final"],"introduced":["4.2.0.Final"],"last_affected":[],"package":"io.netty:netty-codec-http","purl":"pkg:maven/io.netty/netty-codec-http","source":"GHSA-6jqx-86gh-f27w"}],"prev":{"headline":"RestrictedPython guard hooks can be shadowed via positional-only arguments","id":"CVE-2026-55830"},"products":["netty"],"published":"2026-07-20","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":"2026-07-23","vendors":["netty"]},"summary":"Remote attackers can cause heap exhaustion and service disruption by sending large SPDY SETTINGS frames to applications using the Netty library.","url":"https://insights.sbomify.com/CVE-2026-55831/"}