{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-11721 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-11721 is a high-severity vulnerability in ISC BIND 9, published on 22 Jul 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-2026-11721 and fix it if it is affected.\n\nWhat it is: CVE-2026-11721 is a high-severity vulnerability in ISC BIND 9, published on 22 Jul 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-2026-11721 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-2026-11721/ (Markdown: https://insights.sbomify.com/CVE-2026-11721/index.md)","id":"CVE-2026-11721","markdown":"https://insights.sbomify.com/CVE-2026-11721/index.md","name":"CVE-2026-11721","record":{"aliases":["ALPINE-CVE-2026-11721","AZL-93132","BELL-CVE-2026-11721","DEBIAN-CVE-2026-11721","ECHO-d56a-90b8-201c","GHSA-cq66-h8mj-77hh","MINI-3mxw-r6r9-w6wc","MINI-9frh-87j2-8jcx","MINI-mgq4-8mr3-792r","UBUNTU-CVE-2026-11721"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"BIND DNS resolver","requires_auth":"none","summary":"Attackers can poison the DNS cache of BIND resolvers by exploiting a label count discrepancy in RRSIGs, leading to incorrect data resolution.","user_interaction":"not_required","vuln_class":"other"},"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:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-1284","name":"Improper Validation of Specified Quantity in Input"}],"description":"It is possible for an attacker's zone to respond to a query with an RRSIG that has a smaller number of labels than the zone in which the RRSIG is contained. This causes `named` to produce a wildcard name for a zone that is shorter than the attacker's zone, which can result in cache poisoning. For this attack to have any effect, the resolver under attack must have set `synth-from-dnssec yes;` (which is the default).\nThis issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-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":"Cache poisoning possible with label count discrepancy, RRSIG, and wildcards","id":"CVE-2026-11721","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"other","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"IBM WebSphere Application Server and IBM WebSphere Application Server - Liberty HTTP Request Smuggling","id":"CVE-2026-11722"},"packages":[],"prev":{"headline":"Path Traversal in googleapis/mcp-toolbox HTTP Tool URL Builder","id":"CVE-2026-11720"},"products":["BIND 9"],"published":"2026-07-22","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":"2026-07-22","vendors":["ISC"]},"summary":"Attackers can poison the DNS cache of BIND resolvers by exploiting a label count discrepancy in RRSIGs, leading to incorrect data resolution.","url":"https://insights.sbomify.com/CVE-2026-11721/"}