{"answers":{"affected":"4 open source packages ship an affected version, including io.netty:netty-handler. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-75595 in the wild and no public exploit code.","fix":"Upgrade io.netty:netty-handler to a fixed version for your release line: 4.1.137.Final or 4.2.17.Final.","what":"CVE-2026-75595 is a critical authentication bypass vulnerability in Netty Netty, published on 19 Aug 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-2026-75595 and fix it if it is affected.\n\nWhat it is: CVE-2026-75595 is a critical authentication bypass vulnerability in Netty Netty, published on 19 Aug 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-2026-75595 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- io.netty:netty-handler (Maven): affected all versions; fixed in 4.1.137.Final\n- io.netty:netty-handler (Maven): affected all versions; fixed in 4.1.137.Final\n- io.netty:netty-handler (Maven): affected from 4.2.0.Final; fixed in 4.2.17.Final\n- io.netty:netty-handler (Maven): affected from 4.2.0.Final; fixed in 4.2.17.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-2026-75595/ (Markdown: https://insights.sbomify.com/CVE-2026-75595/index.md)","id":"CVE-2026-75595","markdown":"https://insights.sbomify.com/CVE-2026-75595/index.md","name":"CVE-2026-75595","record":{"aliases":["CLEANSTART-2026-FZ84712","CLEANSTART-2026-HW50386","CLEANSTART-2026-HY48105","CLEANSTART-2026-JA68863","CLEANSTART-2026-KP61790","CLEANSTART-2026-PE28143","CLEANSTART-2026-UR07493","CLEANSTART-2026-XW40914","CLSA-2026-1790858840","DEBIAN-CVE-2026-75595","ECHO-68bd-3da7-8843","GHSA-c4c3-7fpv-j4q5","MINI-2538-vh7f-487w","MINI-289m-45cw-qhgg","MINI-28f7-57v5-8qpq","MINI-2h3q-2q4v-j879","MINI-2r7m-g37m-7ffj","MINI-3324-2358-chgq","MINI-33v9-g5gp-v964","MINI-36q7-2jq2-5pmp","MINI-3872-93j6-mx96","MINI-3cx8-rxgf-mhxr","MINI-3rwc-9vpw-q469","MINI-3whg-8hx7-7xvr","MINI-468r-vw85-5rw9","MINI-4mmj-h6vv-q7xv","MINI-4q77-x8h7-vjrc","MINI-4wr4-489v-c7pw","MINI-54xw-m2wj-39mw","MINI-56xq-2m92-36hj","MINI-575j-v9wg-83c8","MINI-5cpm-h37h-89vh","MINI-5j8p-8mq4-qxhq","MINI-5pv6-xjj9-6h76","MINI-5pv7-ccxx-5grq","MINI-5r56-j6r6-c2qh","MINI-5v4m-fq9f-5rwp","MINI-6f6w-q2m4-gc3v","MINI-6f8j-w32w-8pj8","MINI-6pfx-j8fr-cqxr","MINI-6vjv-4ch9-9ffv","MINI-7cwc-rv8x-jhc7","MINI-7gwc-68vv-gpwf","MINI-7rpp-qjp2-hfcf","MINI-7vv3-pj6j-57qj","MINI-7x34-x46g-93cm","MINI-82pm-xjqj-55fr","MINI-82qg-jw99-99m9","MINI-835f-6p8f-ccm2","MINI-877q-r26h-rgqw","MINI-8968-59jc-jjgh","MINI-8jrp-rc3v-3r6f","MINI-8p2f-mp9c-hc9p","MINI-8w7m-7374-9c5h","MINI-8www-c6rx-426v","MINI-999g-j5xr-g3g9","MINI-9h7m-jcch-7799","MINI-9qxv-hh46-p85g","MINI-9w64-r34g-c6xc","MINI-c4qg-mqhx-wc86","MINI-c8h4-7f6j-gx5q","MINI-cgf9-hq7r-xffh","MINI-ch5m-3j49-4q74","MINI-cvwx-p733-px6h","MINI-cxxm-xmhh-f859","MINI-f35x-ffh8-4wcg","MINI-f3wx-v757-4pj2","MINI-f45q-x46h-ch6m","MINI-f4fp-9w54-c78m","MINI-fcmg-hqjj-7qf9","MINI-fj48-c443-vjfj","MINI-fvg2-g4ff-f69r","MINI-fw33-wr72-jf7x","MINI-g66r-jv37-9g3m","MINI-g93r-f759-px2w","MINI-gp66-5ffr-p9r8","MINI-h278-fr54-5685","MINI-h9fp-3fm5-vm7q","MINI-hjf4-43w3-wm3v","MINI-hrjr-xw28-5g79","MINI-hx7j-rrw8-73gc","MINI-j639-73x8-3q2h","MINI-jg6j-w9mj-f3hw","MINI-jhqw-2q72-273x","MINI-jm96-99vg-m58p","MINI-jwj5-wm82-cx7r","MINI-m63v-37w8-jrhw","MINI-m666-xxpm-8qwq","MINI-m9j8-mg56-hc4r","MINI-mh3m-j9pw-4rfj","MINI-mrmh-5432-7qqf","MINI-mvrv-2rfv-cmq4","MINI-pf8x-7p43-9jfj","MINI-pffm-45gr-84mm","MINI-pgjj-4ghw-qjvh","MINI-pgr2-r5gw-28v9","MINI-pj3m-72p4-6g92","MINI-pvc3-vph4-57ch","MINI-pxjx-pf57-cfhw","MINI-qgf7-cv5w-962v","MINI-qqfq-2gw2-mj63","MINI-r247-3jpc-wq78","MINI-r3hx-93j8-52qw","MINI-r68m-vmf2-xjg2","MINI-rf68-x499-5c5g","MINI-rw8p-p83w-j7rp","MINI-rwcf-79wj-phmh","MINI-rwg6-pj75-7wfw","MINI-vcpm-68x3-f4w8","MINI-vg9w-gvp3-2mxh","MINI-vjmm-rmmc-w547","MINI-vv3c-96qg-rcwh","MINI-vv53-9h9c-8x4f","MINI-w2v6-92xp-9858","MINI-w4p5-3f7q-gg9v","MINI-wc7r-586h-6fh6","MINI-wr5j-fj6v-vgvc","MINI-wrfv-hgm7-2g42","MINI-x4f5-wxh4-3xgr","MINI-x7cg-rc7x-4rwm","MINI-x8h5-8m9c-rgjv","MINI-x92f-p3f8-4r67","MINI-xg8w-m38q-gh33","MINI-xrfw-646f-x6c9","MINI-xv8f-vmg4-r3vc","ROOT-APP-MAVEN-CVE-2026-75595","UBUNTU-CVE-2026-75595"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"Netty network framework","requires_auth":"none","summary":"An attacker can bypass mutual TLS authentication in Netty by sending fragmented TLS ClientHello messages, accessing protected routes without valid certificates.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"netty","vendor":"netty"}],"cvss":{"score":9.1,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-754","name":"Improper Check for Unusual or Exceptional Conditions"}],"description":"Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Fina and 4.2.17.Final, io.netty.handler.ssl.SslClientHelloHandler#decode checks the wrong offset before reading the four-byte TLS handshake header, so a ClientHello whose handshake header spans records can cause an IndexOutOfBoundsException and invoke select(ctx, null). This selects the default SslContext instead of the SNI-specific context. In deployments where per-SNI clientAuth=REQUIRE is the sole mutual TLS gate, the default SslContext uses clientAuth=NONE or clientAuth=OPTIONAL, and no application-layer certificate verification exists, an unauthenticated remote attacker can bypass the protected route's mutual TLS requirement. This issue is fixed in versions 4.1.137.Final and 4.2.17.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: SNI Routing Bypass via Fragmented TLS ClientHello Causing Fallback to Default SslContext","id":"CVE-2026-75595","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":"netty:netty","products":["netty:netty"],"type":"auth_bypass","year":"2026"},"n_packages":4,"n_references":7,"next":{"headline":"Netty: Fragmented ClientHello records trigger quadratic pre-handshake reassembly in default SNI parsing","id":"CVE-2026-75596"},"packages":[{"ecosystem":"Maven","fixed":["4.1.137.Final"],"introduced":["0"],"last_affected":[],"package":"io.netty:netty-handler","purl":null,"source":"GHSA-c4c3-7fpv-j4q5"},{"ecosystem":"Maven","fixed":["4.1.137.Final"],"introduced":["0"],"last_affected":[],"package":"io.netty:netty-handler","purl":"pkg:maven/io.netty/netty-handler","source":"GHSA-c4c3-7fpv-j4q5"},{"ecosystem":"Maven","fixed":["4.2.17.Final"],"introduced":["4.2.0.Final"],"last_affected":[],"package":"io.netty:netty-handler","purl":null,"source":"GHSA-c4c3-7fpv-j4q5"},{"ecosystem":"Maven","fixed":["4.2.17.Final"],"introduced":["4.2.0.Final"],"last_affected":[],"package":"io.netty:netty-handler","purl":"pkg:maven/io.netty/netty-handler","source":"GHSA-c4c3-7fpv-j4q5"}],"prev":{"headline":"Kirby: Access to image files and limited access to JSON files outside of the site root via path traversal in the media handling","id":"CVE-2026-75594"},"products":["netty"],"published":"2026-08-19","related":[{"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":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-08-20","vendors":["netty"]},"summary":"An attacker can bypass mutual TLS authentication in Netty by sending fragmented TLS ClientHello messages, accessing protected routes without valid certificates.","url":"https://insights.sbomify.com/CVE-2026-75595/"}