{"answers":{"affected":"3 open source packages ship an affected version, including github.com/coredns/coredns.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-82399 exists.","fix":"Upgrade github.com/coredns/coredns to 1.14.7 or later.","what":"CVE-2026-82399 is a high-severity denial of service vulnerability in coredns, 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-2026-82399 and fix it if it is affected.\n\nWhat it is: CVE-2026-82399 is a high-severity denial of service vulnerability in coredns, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-82399 exists.\n\nAffected packages and fixed versions:\n- github.com/coredns/coredns (Go): affected all versions; fixed in 1.14.7\n- github.com/coredns/coredns (Go): affected all versions; fixed in 1.14.7\n- github.com/coredns/coredns (Go): affected all versions; fixed in 1.14.7\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-2026-82399/ (Markdown: https://insights.sbomify.com/CVE-2026-82399/index.md)","id":"CVE-2026-82399","markdown":"https://insights.sbomify.com/CVE-2026-82399/index.md","name":"CVE-2026-82399","record":{"aliases":["AZL-101838","CLEANSTART-2026-MG32349","ECHO-45c5-eafd-f64c","GHSA-mrg3-qvqr-jw29","GO-2026-6507","MINI-25xq-m3x2-4xpv","MINI-2vv6-24qp-w9w8","MINI-545p-89jc-mffc","MINI-5855-4g23-gv7f","MINI-5jrr-4jxg-c9x4","MINI-5xf7-mfhp-wgfx","MINI-95q2-9hg5-27gf","MINI-98r3-v926-v78g","MINI-c779-vx4r-g8q4","MINI-chr8-c5q5-vv69","MINI-chr8-fgm8-prw8","MINI-f4qg-22ch-h6cr","MINI-j7h6-fxjw-xc3c","MINI-p4fx-8f8m-77vp","MINI-vmrm-wr3c-r9m3","MINI-vrgv-2c9x-3fwm","MINI-w75v-p75p-93v3","MINI-w765-6f55-rfjq","MINI-wv6g-mrg3-68j6","MINI-x2c8-6892-mc5m"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"DNS server","requires_auth":"none","summary":"Unauthenticated attackers can exhaust memory via crafted DNS-over-HTTPS/QUIC/gRPC requests, causing CoreDNS to crash.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","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-770","name":"Allocation of Resources Without Limits or Throttling"}],"description":"CoreDNS is a DNS server written in Go. Prior to 1.14.7, the DNS-over-HTTPS, DNS-over-HTTP/3, DNS-over-QUIC, and DNS-over-gRPC request paths in plugin/pkg/doh/doh.go, core/dnsserver/server_quic.go, and core/dnsserver/server_grpc.go call dns.Msg.Unpack on attacker-controlled DNS section counts before dns.DefaultMsgAcceptFunc validates the fixed header. An unauthenticated client can use DNS name compression and excessive section counts to amplify allocation before the plugin chain, so plugin-level rate limiting cannot prevent concurrent requests from exhausting memory and terminating CoreDNS. The ordinary UDP and TCP listeners are not affected because they validate the header first. This issue is fixed in version 1.14.7.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"CoreDNS: Unauthenticated memory exhaustion in custom transports","id":"CVE-2026-82399","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":3,"next":{"headline":"Gogs: Open Redirect in /redirect endpoint via backslash bypass in `IsSameSite`","id":"CVE-2026-82402"},"packages":[{"ecosystem":"Go","fixed":["1.14.7"],"introduced":["0"],"last_affected":[],"package":"github.com/coredns/coredns","purl":null,"source":"GHSA-mrg3-qvqr-jw29"},{"ecosystem":"Go","fixed":["1.14.7"],"introduced":["0"],"last_affected":[],"package":"github.com/coredns/coredns","purl":"pkg:golang/github.com/coredns/coredns","source":"GHSA-mrg3-qvqr-jw29"},{"ecosystem":"Go","fixed":["1.14.7"],"introduced":["0"],"last_affected":[],"package":"github.com/coredns/coredns","purl":"pkg:golang/github.com/coredns/coredns","source":"GO-2026-6507"}],"prev":{"headline":"pypdf: Inefficient handling of non-whitespace inputs in read_until_whitespace","id":"CVE-2026-82398"},"products":["coredns"],"published":"2026-09-16","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-18","vendors":["coredns"]},"summary":"Unauthenticated attackers can exhaust memory via crafted DNS-over-HTTPS/QUIC/gRPC requests, causing CoreDNS to crash.","url":"https://insights.sbomify.com/CVE-2026-82399/"}