{"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-2026-47244 in the wild and no public exploit code.","fix":"Upgrade io.netty:netty-codec-http2 to a fixed version for your release line: 4.1.135.Final or 4.2.15.Final.","what":"CVE-2026-47244 is a medium-severity denial of service 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-2026-47244 and fix it if it is affected.\n\nWhat it is: CVE-2026-47244 is a medium-severity denial of service 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: There is no known exploitation of CVE-2026-47244 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 4.1.135.Final\n- io.netty:netty-codec-http2 (Maven): affected all versions; fixed in 4.1.135.Final\n- io.netty:netty-codec-http2 (Maven): affected from 4.2.0.Final; fixed in 4.2.15.Final\n- io.netty:netty-codec-http2 (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-2026-47244/ (Markdown: https://insights.sbomify.com/CVE-2026-47244/index.md)","id":"CVE-2026-47244","markdown":"https://insights.sbomify.com/CVE-2026-47244/index.md","name":"CVE-2026-47244","record":{"aliases":["CLEANSTART-2026-AK01289","CLEANSTART-2026-DP99437","CLEANSTART-2026-SI32200","CLEANSTART-2026-VE14667","CLEANSTART-2026-XH56428","CLSA-2026-1792694876","DEBIAN-CVE-2026-47244","ECHO-c5b5-54e8-9e68","GHSA-5x3r-wrvg-rp6q","MINI-26wr-38hq-xv9h","MINI-277j-g2vr-6w4r","MINI-29qh-x863-vh35","MINI-2f8x-wr3w-4c73","MINI-2hc8-pv42-r2v9","MINI-2prh-7g95-j4g5","MINI-3675-9vm8-p958","MINI-3vw5-672f-4f6m","MINI-3xqr-9xv2-7x24","MINI-3xx7-52c7-5fj4","MINI-449w-fq9g-c98q","MINI-44c9-gfrc-rg77","MINI-4fwq-p863-9f9q","MINI-4gpq-62q5-cq7j","MINI-4v36-qjw9-wxx3","MINI-54h8-rwvr-q2h2","MINI-5jg9-grxq-q3x4","MINI-5xqh-9g67-fh69","MINI-6qfx-77jc-86h4","MINI-7mcm-8w3p-gw98","MINI-8rmj-gmjx-fmx3","MINI-94rh-46mw-q78h","MINI-97gw-wx9m-f8vf","MINI-9887-j495-67wq","MINI-9987-4ccg-hccr","MINI-9pr7-w7fr-3rq5","MINI-c753-f844-hr6p","MINI-c98g-8fmx-hqhm","MINI-cfrc-9g96-4962","MINI-ch4p-j36q-ppm7","MINI-cp3w-r6cf-2365","MINI-cwjq-83vx-c55g","MINI-f8w4-88wh-86pf","MINI-fcf7-hrvm-49c9","MINI-ffgh-hv93-gp2p","MINI-fhxc-fvhq-48pv","MINI-g254-7hc7-jc6p","MINI-g8hm-2jhg-q4fq","MINI-g93w-h236-32mp","MINI-g99p-xpc7-683g","MINI-g9mr-89g4-fj6g","MINI-gh47-826q-xmh6","MINI-gjv3-5vph-5qm3","MINI-grf5-32pq-6cqw","MINI-h6mx-c5vp-v32x","MINI-hx28-82r8-fcwq","MINI-j2w8-842q-2mmj","MINI-jc4j-g9xr-hf94","MINI-jchh-845m-gvr7","MINI-m5pj-gwqq-vc54","MINI-m94x-vjm7-wgjx","MINI-mfxq-6fpj-7gh7","MINI-mj88-vxcv-rh34","MINI-p355-w7cv-v8j5","MINI-p5wh-625r-8w8w","MINI-p7jc-pcf2-mgfj","MINI-pcjr-6qgg-5cg8","MINI-pqwp-vf92-hp44","MINI-pv39-6337-xq59","MINI-q377-8chv-jw9c","MINI-q5cw-2p76-gw65","MINI-qmm7-ch9h-m8hp","MINI-qqq4-pq3v-mx3f","MINI-rjhq-wqcr-5rcg","MINI-rmvx-ch69-579g","MINI-rvm6-g4v9-23cr","MINI-vcx3-45v4-wrgf","MINI-vv93-f4fh-jww9","MINI-w5jj-j7pw-g382","MINI-w7xq-98p6-7gm7","MINI-w92g-4gr5-pp89","MINI-wqc9-4f27-3r87","MINI-wwpf-jrhx-3x6q","MINI-x75f-6qcj-g6w6","MINI-x7cf-5hqc-g98g","MINI-x955-gf78-8425","MINI-xvc7-cpx5-rw2q","MINI-xx27-rr4m-q72f","ROOT-APP-MAVEN-CVE-2026-47244","UBUNTU-CVE-2026-47244"],"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":"Netty HTTP/2 servers fail to enforce concurrent stream limits by default, allowing attackers to exhaust resources via excessive streams, causing denial of service.","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":5.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"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, DefaultHttp2Connection.DefaultEndpoint initialises maxActiveStreams/maxStreams to Integer.MAX_VALUE, and Http2Settings never inserts SETTINGS_MAX_CONCURRENT_STREAMS by default (Http2Settings.java:305-307 only clamps a user-supplied value). Unless the application explicitly calls initialSettings().maxConcurrentStreams(n), a Netty HTTP/2 server advertises no limit and enforces none locally. Each open stream allocates a DefaultStream object, PropertyMap slots, flow-controller state and IntObjectHashMap entry; with ~2^30 permissible odd stream IDs a single TCP connection can create hundreds of thousands of long-lived stream objects. This is also the precondition for CVE-2023-44487-style Rapid-Reset amplification, where the absence of a low concurrent cap multiplies backend work. 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":"none_known"},"has_fix":true,"headline":"Netty HTTP/2: Advertised MAX_CONCURRENT_STREAMS are not enforced","id":"CVE-2026-47244","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":3,"next":{"headline":"MyBB: Buddy list corruption","id":"CVE-2026-47245"},"packages":[{"ecosystem":"Maven","fixed":["4.1.135.Final"],"introduced":["0"],"last_affected":[],"package":"io.netty:netty-codec-http2","purl":null,"source":"GHSA-5x3r-wrvg-rp6q"},{"ecosystem":"Maven","fixed":["4.1.135.Final"],"introduced":["0"],"last_affected":[],"package":"io.netty:netty-codec-http2","purl":"pkg:maven/io.netty/netty-codec-http2","source":"GHSA-5x3r-wrvg-rp6q"},{"ecosystem":"Maven","fixed":["4.2.15.Final"],"introduced":["4.2.0.Final"],"last_affected":[],"package":"io.netty:netty-codec-http2","purl":null,"source":"GHSA-5x3r-wrvg-rp6q"},{"ecosystem":"Maven","fixed":["4.2.15.Final"],"introduced":["4.2.0.Final"],"last_affected":[],"package":"io.netty:netty-codec-http2","purl":"pkg:maven/io.netty/netty-codec-http2","source":"GHSA-5x3r-wrvg-rp6q"}],"prev":{"headline":"Kata guest escape: runtime-rs guest-root to host-root escape via virtiofs","id":"CVE-2026-47243"},"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":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-06-12","vendors":["netty"]},"summary":"Netty HTTP/2 servers fail to enforce concurrent stream limits by default, allowing attackers to exhaust resources via excessive streams, causing denial of service.","url":"https://insights.sbomify.com/CVE-2026-47244/"}