{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-19666 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-19666 is a high-severity use after free vulnerability in ISC BIND 9, published on 16 Sep 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-2026-19666 and fix it if it is affected.\n\nWhat it is: CVE-2026-19666 is a high-severity use after free vulnerability in ISC BIND 9, published on 16 Sep 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-2026-19666 in the wild and no public exploit code.\n\nAffected product: ISC BIND 9. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-19666/ (Markdown: https://insights.sbomify.com/CVE-2026-19666/index.md)","id":"CVE-2026-19666","markdown":"https://insights.sbomify.com/CVE-2026-19666/index.md","name":"CVE-2026-19666","record":{"aliases":["ALPINE-CVE-2026-19666","AZL-103365","BELL-CVE-2026-19666","CLSA-2026-1790075993","CLSA-2026-1790152508","DEBIAN-CVE-2026-19666","ECHO-be2e-193c-dd61","GHSA-2rph-fg4h-9hjq","MINI-3f4w-rjcv-frcj","MINI-cxff-fp5v-38fg","MINI-pqmc-j2cp-m575","UBUNTU-CVE-2026-19666"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":true,"product_category":"BIND DNS resolver","requires_auth":"none","summary":"A use-after-free in BIND's DNS64 filter allows remote attackers to crash the named process via malformed DNS responses.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"isc","cpe":[],"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-416","name":"Use After Free"}],"description":"On a resolver configured to use ``dns64``, if an applicable answer from the authoritative server is malformed in a specific way, the resolver `named` process will exit unexpectedly.\nThis issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.","ecosystems":[],"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":"Use-after-free in query_addnoqnameproof() via the DNS64 filter64 path","id":"CVE-2026-19666","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"use_after_free","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"Remote assertion failure via 16-bit length truncation in `dns_ncache_add()`","id":"CVE-2026-19667"},"packages":[],"prev":{"headline":"qpcache NOQNAME proof use-after-free crashes recursive resolver","id":"CVE-2026-19662"},"products":["BIND 9"],"published":"2026-09-16","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2026-09-17","vendors":["ISC"]},"summary":"A use-after-free in BIND's DNS64 filter allows remote attackers to crash the named process via malformed DNS responses.","url":"https://insights.sbomify.com/CVE-2026-19666/"}