{"answers":{"affected":"2 open source packages ship an affected version, including io.netty:netty-transport-classes-epoll. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-42577 in the wild and no public exploit code.","fix":"Upgrade io.netty:netty-transport-classes-epoll to 4.2.13.Final or later.","what":"CVE-2026-42577 is a high-severity denial of service 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-2026-42577 and fix it if it is affected.\n\nWhat it is: CVE-2026-42577 is a high-severity denial of service 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: There is no known exploitation of CVE-2026-42577 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- io.netty:netty-transport-classes-epoll (Maven): affected from 4.2.0.Final; fixed in 4.2.13.Final\n- io.netty:netty-transport-classes-epoll (Maven): affected from 4.2.0.Final; 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-2026-42577/ (Markdown: https://insights.sbomify.com/CVE-2026-42577/index.md)","id":"CVE-2026-42577","markdown":"https://insights.sbomify.com/CVE-2026-42577/index.md","name":"CVE-2026-42577","record":{"aliases":["CLEANSTART-2026-KC30264","CLEANSTART-2026-RE04258","CLEANSTART-2026-RX83323","CLSA-2026-1793142374","DEBIAN-CVE-2026-42577","ECHO-ce1f-ec45-9a4d","GHSA-rwm7-x88c-3g2p","MINI-283c-9449-h98r","MINI-33g3-8mrm-qv2r","MINI-33vv-85cq-mv6j","MINI-353c-93p2-99jh","MINI-3g49-wcvh-725p","MINI-3h5c-qqqc-fmvx","MINI-48rg-46g3-76fm","MINI-4p97-3222-h8p2","MINI-5mf7-jq84-4rw7","MINI-5p2r-6gjw-j3gx","MINI-66w4-gw3v-q2pg","MINI-6gh2-xxf8-px9g","MINI-747v-jxq7-6q85","MINI-78mv-pp5h-r825","MINI-78r5-hr5q-jr88","MINI-78r5-qj83-qf7v","MINI-7fx3-8mmh-jj6v","MINI-87f2-f4hq-c82w","MINI-8qr5-3g78-7mfw","MINI-8rgv-563j-5rpg","MINI-8xjr-q9x7-gx95","MINI-986g-5cxv-pw3f","MINI-9jv5-27x8-685f","MINI-9wmg-jpmj-954m","MINI-cj8w-q8pq-mwpf","MINI-crrj-3hqc-q745","MINI-f2pw-wf3g-85qg","MINI-fp66-v8mh-vg72","MINI-fqw3-cvff-q92h","MINI-g36x-mq82-6385","MINI-g5gf-7wcj-xgxf","MINI-gg63-v82p-jxw9","MINI-grx8-g4mm-xrpj","MINI-h5fj-rhrf-c5g4","MINI-j5wh-9qxm-5r2x","MINI-m63r-hmhq-q78q","MINI-mpfg-j763-fxjr","MINI-q24w-m9f3-7rr8","MINI-q38x-jw75-f95j","MINI-q53p-qh3g-79w7","MINI-q6xx-m23m-74hw","MINI-qxx3-x6g5-rgw2","MINI-rfr9-mrg7-39p4","MINI-rvp3-fpfh-m6mc","MINI-v624-pf69-2pmj","MINI-w3g8-3w99-gfjh","MINI-w42x-mqxr-wfx4","MINI-w473-3vp6-3rvp","MINI-w5x8-3w3v-v798","MINI-w9pg-45qg-2c93","MINI-wwq6-ww22-hfhx","MINI-xqwr-4p2c-wr9f","ROOT-APP-MAVEN-CVE-2026-42577"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Java network framework","requires_auth":"none","summary":"Attackers can cause a denial of service via CPU exhaustion in Netty's epoll transport by sending RST packets on half-closed connections.","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-772","name":"Missing Release of Resource after Effective Lifetime"}],"description":"Netty is an asynchronous, event-driven network application framework. From 4.2.0.Final to 4.2.13.Final , Netty's epoll transport fails to detect and close TCP connections that receive a RST after being half-closed, leading to stale channels that are never cleaned up and, in some code paths, a 100% CPU busy-loop in the event loop thread. This vulnerability is fixed in 4.2.13.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: epoll transport denial of service via RST on half-closed TCP connection","id":"CVE-2026-42577","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":"netty:netty","products":["netty:netty"],"type":"denial_of_service","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"Netty: HTTP Header Injection via HttpProxyHandler Disabled Validation","id":"CVE-2026-42578"},"packages":[{"ecosystem":"Maven","fixed":["4.2.13.Final"],"introduced":["4.2.0.Final"],"last_affected":[],"package":"io.netty:netty-transport-classes-epoll","purl":null,"source":"GHSA-rwm7-x88c-3g2p"},{"ecosystem":"Maven","fixed":["4.2.13.Final"],"introduced":["4.2.0.Final"],"last_affected":[],"package":"io.netty:netty-transport-classes-epoll","purl":"pkg:maven/io.netty/netty-transport-classes-epoll","source":"GHSA-rwm7-x88c-3g2p"}],"prev":{"headline":"apko `DiscoverKeys` has a panic on non-rsa jwks key that causes crash during key discovery","id":"CVE-2026-42576"},"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":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-05-14","vendors":["netty"]},"summary":"Attackers can cause a denial of service via CPU exhaustion in Netty's epoll transport by sending RST packets on half-closed connections.","url":"https://insights.sbomify.com/CVE-2026-42577/"}