{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-40211 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-40211 is a medium-severity denial of service vulnerability in PowerDNS DNSdist, published on 25 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-2026-40211 and fix it if it is affected.\n\nWhat it is: CVE-2026-40211 is a medium-severity denial of service vulnerability in PowerDNS DNSdist, published on 25 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-2026-40211 in the wild and no public exploit code.\n\nAffected product: PowerDNS DNSdist. 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-2026-40211/ (Markdown: https://insights.sbomify.com/CVE-2026-40211/index.md)","id":"CVE-2026-40211","markdown":"https://insights.sbomify.com/CVE-2026-40211/index.md","name":"CVE-2026-40211","record":{"aliases":["DEBIAN-CVE-2026-40211","GHSA-8mqg-g8g6-fvw6","UBUNTU-CVE-2026-40211"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"DNS load balancer","requires_auth":"none","summary":"An attacker can cause a denial of service in PowerDNS DNSdist by sending crafted DNS over HTTP/3 queries that trigger an out-of-memory condition.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"OX","cpe":[],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"}],"description":"An attacker can send crafted DNS over HTTP/3 queries, triggering an exception that prevents some buffer from being freed right away. The buffer will be freed at the end of the QUIC connection, but on some setups it might be possible to open enough concurrent DoH3 streams to trigger an out-of-memory condition, resulting in a denial of service.","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":"Denial of service via crafted DoH3 queries","id":"CVE-2026-40211","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Cross-site scripting in Skyline","id":"CVE-2026-40212"},"packages":[],"prev":{"headline":"Out-of-bounds read in SetMacAddrAction","id":"CVE-2026-40210"},"products":["DNSdist"],"published":"2026-06-25","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":"2026-06-25","vendors":["PowerDNS"]},"summary":"An attacker can cause a denial of service in PowerDNS DNSdist by sending crafted DNS over HTTP/3 queries that trigger an out-of-memory condition.","url":"https://insights.sbomify.com/CVE-2026-40211/"}