{"answers":{"affected":"4 open source packages ship an affected version, including io.netty:netty-resolver-dns. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-45674 in the wild and no public exploit code.","fix":"Upgrade io.netty:netty-resolver-dns to a fixed version for your release line: 4.1.135.Final or 4.2.15.Final.","what":"CVE-2026-45674 is a high-severity 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-2026-45674 and fix it if it is affected.\n\nWhat it is: CVE-2026-45674 is a high-severity 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-2026-45674 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- io.netty:netty-resolver-dns (Maven): affected all versions; fixed in 4.1.135.Final\n- io.netty:netty-resolver-dns (Maven): affected all versions; fixed in 4.1.135.Final\n- io.netty:netty-resolver-dns (Maven): affected from 4.2.0.Final; fixed in 4.2.15.Final\n- io.netty:netty-resolver-dns (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-2026-45674/ (Markdown: https://insights.sbomify.com/CVE-2026-45674/index.md)","id":"CVE-2026-45674","markdown":"https://insights.sbomify.com/CVE-2026-45674/index.md","name":"CVE-2026-45674","record":{"aliases":["CLEANSTART-2026-AG72812","CLEANSTART-2026-CD10863","CLEANSTART-2026-JI47500","CLEANSTART-2026-NB58291","DEBIAN-CVE-2026-45674","ECHO-b66e-8a32-1e5f","GHSA-676x-f7gg-47vc","MINI-268c-66hx-rc6h","MINI-27qw-2rj8-h7jr","MINI-2hcv-jp88-gcfr","MINI-2mqg-q633-45r5","MINI-2rj3-x5pp-p8x3","MINI-36hw-9ww4-cmmj","MINI-39m3-fm34-v2x8","MINI-3cvq-rfvw-mjgh","MINI-3f5h-q4vj-p47m","MINI-3rhf-22xg-6f2f","MINI-3xwm-v447-v276","MINI-4244-9jmv-ppfh","MINI-4hh7-75ww-j7c9","MINI-4q7c-f49j-v6gv","MINI-569m-2x4w-ff89","MINI-5rqc-f835-q9r6","MINI-5v5r-r56w-chjc","MINI-6889-2hc3-mqhx","MINI-6f79-rh62-wm53","MINI-6j3g-rxv8-h55r","MINI-76hx-2277-xp8f","MINI-7737-f527-5m9h","MINI-7f6f-jr6x-jg62","MINI-7xqv-99m6-j75h","MINI-8r33-j4ph-wfwx","MINI-9443-2qw9-855x","MINI-9g69-47fp-34x9","MINI-9rw4-vfc7-qhr4","MINI-c4g8-ph34-327x","MINI-cj99-cvhq-hrwm","MINI-cm3h-2vw5-9q2v","MINI-cqf9-hc3w-qp69","MINI-cw6v-3v5x-39vc","MINI-f2p8-x524-7866","MINI-fx7q-rcrr-2vjv","MINI-gc33-f7g4-5vqj","MINI-ggjr-pfrh-vm58","MINI-gjmv-jvwj-2cmc","MINI-gwf2-f9r5-59p2","MINI-h5r5-4qr2-pph4","MINI-jc66-v25g-cqww","MINI-jgcq-v3fj-vq2g","MINI-jh3x-4hxv-v2xr","MINI-jmm2-qcqv-89v4","MINI-jmwm-xxcr-cvjq","MINI-jpp3-vx47-5pwj","MINI-m2wr-595r-4qvw","MINI-m2x6-89p9-wj5w","MINI-mm7g-p6gh-hh6w","MINI-p37w-vg84-gcgc","MINI-p84p-w95p-wvcq","MINI-pc86-qm2h-mv39","MINI-pwpx-2h7p-vv72","MINI-q3mg-mfr7-47xw","MINI-q55h-v7p8-cwx6","MINI-qchr-4chp-ff8f","MINI-qhhh-jwqf-9gjq","MINI-qppx-4xf9-6rv9","MINI-qx7v-gg9j-942w","MINI-rc25-3mgh-gpfw","MINI-rjp7-m2wr-v2c5","MINI-rjv3-m4g2-xm82","MINI-rv28-7338-wvpg","MINI-vrpw-jj9m-34fv","MINI-w994-4w2v-p64f","MINI-wc5v-hh3q-vcrm","MINI-wchm-28w9-x3rq","MINI-wf99-8fx9-3qgh","MINI-wff5-jg5c-66jg","MINI-wg9q-m32c-66p5","MINI-whm4-8rh5-88p2","MINI-wj3h-726p-w24q","MINI-wm45-h36q-pqrj","MINI-wpqv-82xp-97fv","MINI-wvf9-w23q-5pvc","MINI-xj7g-5qj2-w67r","MINI-xmgx-jqg5-qchj","MINI-xq94-qp7m-f6ff","ROOT-APP-MAVEN-CVE-2026-45674","UBUNTU-CVE-2026-45674"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Netty network framework","requires_auth":"none","summary":"Netty fails to validate CNAME record origins, allowing DNS cache poisoning attacks that bypass security controls.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"netty","vendor":"netty"}],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-346","name":"Origin Validation Error"},{"id":"CWE-345","name":"Insufficient Verification of Data Authenticity"}],"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, Netty's DnsResolveContext fails to validate the origin (bailiwick) of CNAME records in DNS responses. Versions 4.1.135.Final and 4.2.15.Final patch the issue.","ecosystems":["Maven"],"exploits":{"exploitdb":0,"first_seen":"2026-09-11","github_poc":1,"max_poc_stars":0,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-09-11T11:37:08Z","kind":"github_poc","ref":"https://github.com/xiaoqiMikko/netty-resolver-dns-check","stars":0,"title":"CVE-2026-45674 / CVE-2026-47691 / CVE-2026-45673: offline checker for DNS cache poisoning in io.netty:netty-resolver-dns - and whether your app actually uses that resolver. Spring WebClient on Reactor Netty uses it by default, although it is not in your pom.xml."}],"tier":"poc_unverified"},"has_fix":true,"headline":"Netty Vulnerable to DNS Cache Poisoning via Missing Bailiwick Checks in CNAME Records","id":"CVE-2026-45674","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":"Open WebUI: LDAP and OAuth First-User Race Condition Allows Multiple Admin Accounts","id":"CVE-2026-45675"},"packages":[{"ecosystem":"Maven","fixed":["4.1.135.Final"],"introduced":["0"],"last_affected":[],"package":"io.netty:netty-resolver-dns","purl":null,"source":"GHSA-676x-f7gg-47vc"},{"ecosystem":"Maven","fixed":["4.1.135.Final"],"introduced":["0"],"last_affected":[],"package":"io.netty:netty-resolver-dns","purl":"pkg:maven/io.netty/netty-resolver-dns","source":"GHSA-676x-f7gg-47vc"},{"ecosystem":"Maven","fixed":["4.2.15.Final"],"introduced":["4.2.0.Final"],"last_affected":[],"package":"io.netty:netty-resolver-dns","purl":null,"source":"GHSA-676x-f7gg-47vc"},{"ecosystem":"Maven","fixed":["4.2.15.Final"],"introduced":["4.2.0.Final"],"last_affected":[],"package":"io.netty:netty-resolver-dns","purl":"pkg:maven/io.netty/netty-resolver-dns","source":"GHSA-676x-f7gg-47vc"}],"prev":{"headline":"Netty: DNS Cache Poisoning due to Predictable PRNG and Default Static Source Port","id":"CVE-2026-45673"},"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 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)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-09-18","vendors":["netty"]},"summary":"Netty fails to validate CNAME record origins, allowing DNS cache poisoning attacks that bypass security controls.","url":"https://insights.sbomify.com/CVE-2026-45674/"}