{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-4891 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-4891 is a medium-severity memory corruption vulnerability in dnsmasq, published on 11 May 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-2026-4891 and fix it if it is affected.\n\nWhat it is: CVE-2026-4891 is a medium-severity memory corruption vulnerability in dnsmasq, published on 11 May 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-2026-4891 in the wild and no public exploit code.\n\nAffected product: dnsmasq. 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-2026-4891/ (Markdown: https://insights.sbomify.com/CVE-2026-4891/index.md)","id":"CVE-2026-4891","markdown":"https://insights.sbomify.com/CVE-2026-4891/index.md","name":"CVE-2026-4891","record":{"aliases":["ALPINE-CVE-2026-4891","AZL-86757","BELL-CVE-2026-4891","CLEANSTART-2026-BB03261","DEBIAN-CVE-2026-4891","GHSA-2qp9-xr4x-2cr9","UBUNTU-CVE-2026-4891"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"DNS server","requires_auth":"none","summary":"Remote attackers can cause denial of service in dnsmasq via crafted DNS packets exploiting a heap-based out-of-bounds read in DNSSEC validation.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"certcc","cpe":[],"cvss":{"score":5.3,"severity":"medium","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-125","name":"Out-of-bounds Read"}],"description":"A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.","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":"CVE-2026-4891","id":"CVE-2026-4891","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2026"},"n_packages":0,"n_references":6,"next":{"headline":"CVE-2026-4892","id":"CVE-2026-4892"},"packages":[],"prev":{"headline":"CVE-2026-4890","id":"CVE-2026-4890"},"products":["dnsmasq"],"published":"2026-05-11","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":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-01","vendors":["dnsmasq"]},"summary":"Remote attackers can cause denial of service in dnsmasq via crafted DNS packets exploiting a heap-based out-of-bounds read in DNSSEC validation.","url":"https://insights.sbomify.com/CVE-2026-4891/"}