{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-42255 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-42255 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-42255 is a high-severity denial of service vulnerability in Technitium DnsServer, published on 26 Apr 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-2026-42255 and fix it if it is affected.\n\nWhat it is: CVE-2026-42255 is a high-severity denial of service vulnerability in Technitium DnsServer, published on 26 Apr 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-2026-42255 in the wild and no public exploit code.\n\nAffected product: Technitium DnsServer. 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-2026-42255/ (Markdown: https://insights.sbomify.com/CVE-2026-42255/index.md)","id":"CVE-2026-42255","markdown":"https://insights.sbomify.com/CVE-2026-42255/index.md","name":"CVE-2026-42255","record":{"aliases":["GHSA-v7f3-6mf2-m8hj"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"DNS server software","requires_auth":"none","summary":"Attackers can cause DNS traffic amplification and denial of service via cyclic name server delegation in Technitium DNS Server.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"dnsserver","vendor":"technitium"}],"cvss":{"score":7.2,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L","version":"3.1"},"cwes":[{"id":"CWE-684","name":"Incorrect Provision of Specified Functionality"}],"description":"Technitium DNS Server before 15.0 allows DNS traffic amplification via cyclic name server delegation.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"Denial of service in DnsServer","id":"CVE-2026-42255","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":"net-imap: Denial of service via high iteration count for `SCRAM-*` authentication","id":"CVE-2026-42256"},"packages":[],"prev":{"headline":"Other in Hickory DNS","id":"CVE-2026-42254"},"products":["DnsServer"],"published":"2026-04-26","related":[{"cvss_score":7.5,"headline":"Denial of service in n/a","id":"CVE-2025-50334","kev_date_added":null,"published":"2026-01-08"},{"cvss_score":7.5,"headline":"Other in n/a","id":"CVE-2024-56089","kev_date_added":null,"published":"2025-12-01"},{"cvss_score":7.5,"headline":"Denial of service in n/a","id":"CVE-2023-28451","kev_date_added":null,"published":"2024-09-18"},{"cvss_score":7.5,"headline":"Denial of service in n/a","id":"CVE-2023-28455","kev_date_added":null,"published":"2024-09-18"},{"cvss_score":7.5,"headline":"Denial of service in n/a","id":"CVE-2023-28456","kev_date_added":null,"published":"2024-09-18"},{"cvss_score":7.5,"headline":"Other in n/a","id":"CVE-2023-28457","kev_date_added":null,"published":"2024-09-18"},{"cvss_score":7.5,"headline":"Denial of service in n/a","id":"CVE-2023-49203","kev_date_added":null,"published":"2024-09-18"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-04-27","vendors":["Technitium"]},"summary":"Attackers can cause DNS traffic amplification and denial of service via cyclic name server delegation in Technitium DNS Server.","url":"https://insights.sbomify.com/CVE-2026-42255/"}