{"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-2026-47691 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-2026-47691 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-2026-47691 and fix it if it is affected.\n\nWhat it is: CVE-2026-47691 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-2026-47691 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-2026-47691/ (Markdown: https://insights.sbomify.com/CVE-2026-47691/index.md)","id":"CVE-2026-47691","markdown":"https://insights.sbomify.com/CVE-2026-47691/index.md","name":"CVE-2026-47691","record":{"aliases":["CLEANSTART-2026-GJ61337","CLEANSTART-2026-QG30470","CLEANSTART-2026-TY33205","CLEANSTART-2026-XI69857","DEBIAN-CVE-2026-47691","ECHO-d6a5-6169-94ec","GHSA-5pvg-856g-cp85","MINI-23jr-82fm-w3r9","MINI-23qm-rvp6-3mw5","MINI-25gv-74gc-xfxc","MINI-28gj-cmq4-c923","MINI-2pvv-x9hv-cmjc","MINI-32f5-7j6f-9fcr","MINI-375c-69p8-gr49","MINI-3g77-3wg6-2jg4","MINI-3mc7-xj4p-w83x","MINI-3rr8-57w3-4pcp","MINI-3w5p-xcm3-gmvh","MINI-4c4j-7r87-2gqm","MINI-4qm5-vh7p-73hh","MINI-4v4x-6hw4-87cw","MINI-4x94-qrr5-qm74","MINI-5785-5jv5-252r","MINI-5mxc-xm3v-vxq5","MINI-5w3h-396m-hm74","MINI-6c89-jw2v-9f8f","MINI-6jwj-5hq8-3626","MINI-6mw3-rm86-qwq9","MINI-7wh6-v9xh-x2xc","MINI-84hw-rmgh-9m3v","MINI-8gcr-523p-27vp","MINI-8q5v-hv44-9j4v","MINI-93mv-3hq6-wrhm","MINI-99q3-jph7-8m6f","MINI-9h69-273x-6r9c","MINI-9j8h-jw55-v5jq","MINI-9p64-pc24-qx29","MINI-9x77-pg39-7rg7","MINI-c7m6-g35v-5473","MINI-c824-fxf2-4fmc","MINI-c92j-xq3p-p2rh","MINI-cc7c-7x2r-99v7","MINI-cwwq-36g4-c38m","MINI-f24j-xwjf-pc8w","MINI-f3xq-q964-hgqf","MINI-f58m-rw2h-f4hc","MINI-f7f7-jrxw-2phx","MINI-fc39-6qqp-5xvm","MINI-g443-hp3j-6j2x","MINI-g8vg-fgh6-869m","MINI-gphw-cccv-fhjx","MINI-gwfp-5qrp-wm6m","MINI-h44j-gpw8-hm37","MINI-h6mp-rw2h-7p37","MINI-hph6-77wg-8rjv","MINI-j3vr-6c3c-f84c","MINI-jhh5-px9r-jvw6","MINI-jw9w-w8hf-h3cx","MINI-m2wv-qh45-f3wf","MINI-mjm6-mjc2-985x","MINI-mm2g-rv4v-hf74","MINI-mpf9-grh3-f9j3","MINI-mrh4-x262-qvwj","MINI-mrp7-p2j7-mf58","MINI-p26x-4w9h-h6mm","MINI-p3xq-w293-f537","MINI-pj24-6xj6-f5mq","MINI-ppjr-5cjq-jg35","MINI-q5px-5pw2-9mc7","MINI-qfpp-73gp-2mpx","MINI-qr75-7hg6-3hmf","MINI-qwrc-cv87-qwpg","MINI-r2x3-v8hm-mjc8","MINI-r466-vchj-hj8w","MINI-rvr5-pphg-3x39","MINI-v252-wxw7-5hjc","MINI-v2rv-9359-65xh","MINI-vhrr-2gfx-qcp7","MINI-vv9p-8rf2-c92r","MINI-w4xp-vr74-963m","MINI-w7g4-34r3-6w7v","MINI-wqmf-3xrv-phvh","MINI-wvg6-6qh4-f439","MINI-x4hx-g98g-mr66","MINI-xxw8-625x-h946","ROOT-APP-MAVEN-CVE-2026-47691","UBUNTU-CVE-2026-47691","USN-8742-1"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Java network framework","requires_auth":"none","summary":"Netty's insufficient bailiwick validation allows attackers to poison DNS caches for parent domains, leading to potential traffic redirection or data interception.","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` insufficiently validates the bailiwick of NS records, enabling DNS Cache Poisoning. An attacker controlling an authoritative name server for a subdomain can poison the cache for parent domains (like `.co.uk`). In `io.netty.resolver.dns.DnsResolveContext.AuthoritativeNameServerList#add` method accepts any NS record from the AUTHORITY section as long as the record's name is a suffix of the questionName. Subsequently, the `handleWithAdditional` method caches the associated A records from the ADDITIONAL section directly into the `authoritativeDnsServerCache` under the parent domain's key. This bypasses standard bailiwick rules, where a server authoritative for a subdomain should not be trusted to provide authoritative records for its parent. The poisoned cache is then used for all future resolutions under the parent domain's key. 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 has Insufficient Bailiwick Validation for NS Records","id":"CVE-2026-47691","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":"Other in envoy","id":"CVE-2026-47692"},"packages":[{"ecosystem":"Maven","fixed":["4.1.135.Final"],"introduced":["0"],"last_affected":[],"package":"io.netty:netty-resolver-dns","purl":null,"source":"GHSA-5pvg-856g-cp85"},{"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-5pvg-856g-cp85"},{"ecosystem":"Maven","fixed":["4.2.15.Final"],"introduced":["4.2.0.Final"],"last_affected":[],"package":"io.netty:netty-resolver-dns","purl":null,"source":"GHSA-5pvg-856g-cp85"},{"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-5pvg-856g-cp85"}],"prev":{"headline":"MeltanoHub vulnerable to command injection in the `test_dispatcher` GitHub Actions workflow","id":"CVE-2026-47690"},"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"}],"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":"2026-09-18","vendors":["netty"]},"summary":"Netty's insufficient bailiwick validation allows attackers to poison DNS caches for parent domains, leading to potential traffic redirection or data interception.","url":"https://insights.sbomify.com/CVE-2026-47691/"}