{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-81642 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-81642 is a critical memory corruption vulnerability in Nlnetlabs Unbound, 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-2026-81642 and fix it if it is affected.\n\nWhat it is: CVE-2026-81642 is a critical memory corruption vulnerability in Nlnetlabs Unbound, published on 16 Sep 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-2026-81642 in the wild and no public exploit code.\n\nAffected product: Nlnetlabs Unbound. 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-2026-81642/ (Markdown: https://insights.sbomify.com/CVE-2026-81642/index.md)","id":"CVE-2026-81642","markdown":"https://insights.sbomify.com/CVE-2026-81642/index.md","name":"CVE-2026-81642","record":{"aliases":["ALPINE-CVE-2026-81642","AZL-101709","CLSA-2026-1790264021","CLSA-2026-1790264968","CLSA-2026-1790590437","DEBIAN-CVE-2026-81642","ECHO-8edc-ef1d-692f","GHSA-xxc4-rpp8-3fw7","OESA-2026-4130","RHSA-2026:71459","RHSA-2026:71460","RHSA-2026:71610","RHSA-2026:71611","RHSA-2026:72110","RHSA-2026:72183","RHSA-2026:72199","RHSA-2026:72264","ROOT-OS-DEBIAN-12-CVE-2026-81642","UBUNTU-CVE-2026-81642"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"DNS resolver","requires_auth":"none","summary":"A heap buffer overflow in Unbound's DNSSEC validator allows remote code execution or denial of service via malicious DNSKEY records.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"NLnet Labs","cpe":[{"product":"unbound","vendor":"nlnetlabs"}],"cvss":{"score":9.1,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:U/U:Red","version":"4.0"},"cwes":[{"id":"CWE-122","name":"Heap-based Buffer Overflow"}],"description":"In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in the DNSSEC validator that enables denial of service and possible remote code execution as a result of digesting DNSKEYs. A DNSKEY with an owner compression pointer to its own RDATA can overflow the digest buffer. Remote code execution is possible through attacker controlled data. An adversary can exploit the vulnerability by controlling a malicious zone and querying a vulnerable Unbound.","ecosystems":["Red Hat:enterprise_linux_eus:10.0","Red Hat:rhel_aus:8.4::appstream","Red Hat:rhel_aus:8.6::appstream","Red Hat:rhel_e4s:8.8::appstream","Red Hat:rhel_e4s:9.2::appstream","Red Hat:rhel_e4s:9.4::appstream","Red Hat:rhel_els:7","Red Hat:rhel_eus:9.6::appstream","Red Hat:rhel_eus_long_life:8.4::appstream","Red Hat:rhel_eus_long_life:8.6::appstream","Red Hat:rhel_tus:8.8::appstream"],"exploits":{"exploitdb":0,"first_seen":"2026-09-18","github_poc":1,"max_poc_stars":0,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-09-18T04:22:42Z","kind":"github_poc","ref":"https://github.com/suominen/CVE-2026-81642","stars":0,"title":"Tracking the Unbound CVE-2026-81642 DNSKEY digest heap overflow"}],"tier":"poc_unverified"},"has_fix":true,"headline":"Heap buffer overflow and possible Remote Code Execution when digesting DNSKEY","id":"CVE-2026-81642","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"nlnetlabs:unbound","products":["nlnetlabs:unbound"],"type":"memory_corruption","year":"2026"},"n_packages":47,"n_references":1,"next":{"headline":"Missing authorization in ash graphql","id":"CVE-2026-81643"},"packages":[{"ecosystem":"Red Hat:enterprise_linux_eus:10.0","fixed":["0:1.20.0-18.el10_0.13"],"introduced":["0"],"last_affected":[],"package":"unbound","purl":"pkg:rpm/redhat/unbound","source":"RHSA-2026:71459"},{"ecosystem":"Red Hat:enterprise_linux_eus:10.0","fixed":["0:1.20.0-18.el10_0.13"],"introduced":["0"],"last_affected":[],"package":"unbound-libs","purl":"pkg:rpm/redhat/unbound-libs","source":"RHSA-2026:71459"},{"ecosystem":"Red Hat:rhel_aus:8.4::appstream","fixed":["0:1.7.3-15.el8_4.4"],"introduced":["0"],"last_affected":[],"package":"unbound","purl":"pkg:rpm/redhat/unbound","source":"RHSA-2026:72183"},{"ecosystem":"Red Hat:rhel_aus:8.4::appstream","fixed":["0:1.7.3-15.el8_4.4"],"introduced":["0"],"last_affected":[],"package":"unbound-libs","purl":"pkg:rpm/redhat/unbound-libs","source":"RHSA-2026:72183"},{"ecosystem":"Red Hat:rhel_aus:8.6::appstream","fixed":["0:1.7.3-17.el8_6.8"],"introduced":["0"],"last_affected":[],"package":"unbound","purl":"pkg:rpm/redhat/unbound","source":"RHSA-2026:72110"},{"ecosystem":"Red Hat:rhel_aus:8.6::appstream","fixed":["0:1.7.3-17.el8_6.8"],"introduced":["0"],"last_affected":[],"package":"unbound-libs","purl":"pkg:rpm/redhat/unbound-libs","source":"RHSA-2026:72110"},{"ecosystem":"Red Hat:rhel_e4s:8.8::appstream","fixed":["0:1.16.2-5.el8_8.6"],"introduced":["0"],"last_affected":[],"package":"python3-unbound","purl":"pkg:rpm/redhat/python3-unbound","source":"RHSA-2026:72264"},{"ecosystem":"Red Hat:rhel_e4s:8.8::appstream","fixed":["0:1.16.2-5.el8_8.6"],"introduced":["0"],"last_affected":[],"package":"python3-unbound-debuginfo","purl":"pkg:rpm/redhat/python3-unbound-debuginfo","source":"RHSA-2026:72264"},{"ecosystem":"Red Hat:rhel_e4s:8.8::appstream","fixed":["0:1.16.2-5.el8_8.6"],"introduced":["0"],"last_affected":[],"package":"unbound","purl":"pkg:rpm/redhat/unbound","source":"RHSA-2026:72264"},{"ecosystem":"Red Hat:rhel_e4s:8.8::appstream","fixed":["0:1.16.2-5.el8_8.6"],"introduced":["0"],"last_affected":[],"package":"unbound-debuginfo","purl":"pkg:rpm/redhat/unbound-debuginfo","source":"RHSA-2026:72264"},{"ecosystem":"Red Hat:rhel_e4s:8.8::appstream","fixed":["0:1.16.2-5.el8_8.6"],"introduced":["0"],"last_affected":[],"package":"unbound-debugsource","purl":"pkg:rpm/redhat/unbound-debugsource","source":"RHSA-2026:72264"},{"ecosystem":"Red Hat:rhel_e4s:8.8::appstream","fixed":["0:1.16.2-5.el8_8.6"],"introduced":["0"],"last_affected":[],"package":"unbound-devel","purl":"pkg:rpm/redhat/unbound-devel","source":"RHSA-2026:72264"},{"ecosystem":"Red Hat:rhel_e4s:8.8::appstream","fixed":["0:1.16.2-5.el8_8.6"],"introduced":["0"],"last_affected":[],"package":"unbound-libs","purl":"pkg:rpm/redhat/unbound-libs","source":"RHSA-2026:72264"},{"ecosystem":"Red Hat:rhel_e4s:8.8::appstream","fixed":["0:1.16.2-5.el8_8.6"],"introduced":["0"],"last_affected":[],"package":"unbound-libs-debuginfo","purl":"pkg:rpm/redhat/unbound-libs-debuginfo","source":"RHSA-2026:72264"},{"ecosystem":"Red Hat:rhel_e4s:9.2::appstream","fixed":["0:1.16.2-3.el9_2.6"],"introduced":["0"],"last_affected":[],"package":"python3-unbound","purl":"pkg:rpm/redhat/python3-unbound","source":"RHSA-2026:71610"},{"ecosystem":"Red Hat:rhel_e4s:9.2::appstream","fixed":["0:1.16.2-3.el9_2.6"],"introduced":["0"],"last_affected":[],"package":"python3-unbound-debuginfo","purl":"pkg:rpm/redhat/python3-unbound-debuginfo","source":"RHSA-2026:71610"},{"ecosystem":"Red Hat:rhel_e4s:9.2::appstream","fixed":["0:1.16.2-3.el9_2.6"],"introduced":["0"],"last_affected":[],"package":"unbound","purl":"pkg:rpm/redhat/unbound","source":"RHSA-2026:71610"},{"ecosystem":"Red Hat:rhel_e4s:9.2::appstream","fixed":["0:1.16.2-3.el9_2.6"],"introduced":["0"],"last_affected":[],"package":"unbound-debuginfo","purl":"pkg:rpm/redhat/unbound-debuginfo","source":"RHSA-2026:71610"},{"ecosystem":"Red Hat:rhel_e4s:9.2::appstream","fixed":["0:1.16.2-3.el9_2.6"],"introduced":["0"],"last_affected":[],"package":"unbound-debugsource","purl":"pkg:rpm/redhat/unbound-debugsource","source":"RHSA-2026:71610"},{"ecosystem":"Red Hat:rhel_e4s:9.2::appstream","fixed":["0:1.16.2-3.el9_2.6"],"introduced":["0"],"last_affected":[],"package":"unbound-libs","purl":"pkg:rpm/redhat/unbound-libs","source":"RHSA-2026:71610"},{"ecosystem":"Red Hat:rhel_e4s:9.2::appstream","fixed":["0:1.16.2-3.el9_2.6"],"introduced":["0"],"last_affected":[],"package":"unbound-libs-debuginfo","purl":"pkg:rpm/redhat/unbound-libs-debuginfo","source":"RHSA-2026:71610"},{"ecosystem":"Red Hat:rhel_e4s:9.4::appstream","fixed":["0:1.16.2-8.el9_4.3"],"introduced":["0"],"last_affected":[],"package":"python3-unbound","purl":"pkg:rpm/redhat/python3-unbound","source":"RHSA-2026:71611"},{"ecosystem":"Red Hat:rhel_e4s:9.4::appstream","fixed":["0:1.16.2-8.el9_4.3"],"introduced":["0"],"last_affected":[],"package":"python3-unbound-debuginfo","purl":"pkg:rpm/redhat/python3-unbound-debuginfo","source":"RHSA-2026:71611"},{"ecosystem":"Red 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Hat:rhel_e4s:9.4::appstream","fixed":["0:1.16.2-8.el9_4.3"],"introduced":["0"],"last_affected":[],"package":"unbound-libs-debuginfo","purl":"pkg:rpm/redhat/unbound-libs-debuginfo","source":"RHSA-2026:71611"},{"ecosystem":"Red Hat:rhel_els:7","fixed":["0:1.6.6-5.el7_9.2"],"introduced":["0"],"last_affected":[],"package":"unbound","purl":"pkg:rpm/redhat/unbound","source":"RHSA-2026:72199"},{"ecosystem":"Red Hat:rhel_els:7","fixed":["0:1.6.6-5.el7_9.2"],"introduced":["0"],"last_affected":[],"package":"unbound-debuginfo","purl":"pkg:rpm/redhat/unbound-debuginfo","source":"RHSA-2026:72199"},{"ecosystem":"Red Hat:rhel_els:7","fixed":["0:1.6.6-5.el7_9.2"],"introduced":["0"],"last_affected":[],"package":"unbound-devel","purl":"pkg:rpm/redhat/unbound-devel","source":"RHSA-2026:72199"},{"ecosystem":"Red Hat:rhel_els:7","fixed":["0:1.6.6-5.el7_9.2"],"introduced":["0"],"last_affected":[],"package":"unbound-libs","purl":"pkg:rpm/redhat/unbound-libs","source":"RHSA-2026:72199"},{"ecosystem":"Red Hat:rhel_els:7","fixed":["0:1.6.6-5.el7_9.2"],"introduced":["0"],"last_affected":[],"package":"unbound-python","purl":"pkg:rpm/redhat/unbound-python","source":"RHSA-2026:72199"},{"ecosystem":"Red Hat:rhel_eus:9.6::appstream","fixed":["0:1.16.2-19.el9_6.2"],"introduced":["0"],"last_affected":[],"package":"unbound","purl":"pkg:rpm/redhat/unbound","source":"RHSA-2026:71460"},{"ecosystem":"Red Hat:rhel_eus:9.6::appstream","fixed":["0:1.16.2-19.el9_6.2"],"introduced":["0"],"last_affected":[],"package":"unbound-libs","purl":"pkg:rpm/redhat/unbound-libs","source":"RHSA-2026:71460"},{"ecosystem":"Red Hat:rhel_eus_long_life:8.4::appstream","fixed":["0:1.7.3-15.el8_4.4"],"introduced":["0"],"last_affected":[],"package":"unbound","purl":"pkg:rpm/redhat/unbound","source":"RHSA-2026:72183"},{"ecosystem":"Red Hat:rhel_eus_long_life:8.4::appstream","fixed":["0:1.7.3-15.el8_4.4"],"introduced":["0"],"last_affected":[],"package":"unbound-libs","purl":"pkg:rpm/redhat/unbound-libs","source":"RHSA-2026:72183"},{"ecosystem":"Red Hat:rhel_eus_long_life:8.6::appstream","fixed":["0:1.7.3-17.el8_6.8"],"introduced":["0"],"last_affected":[],"package":"unbound","purl":"pkg:rpm/redhat/unbound","source":"RHSA-2026:72110"},{"ecosystem":"Red Hat:rhel_eus_long_life:8.6::appstream","fixed":["0:1.7.3-17.el8_6.8"],"introduced":["0"],"last_affected":[],"package":"unbound-libs","purl":"pkg:rpm/redhat/unbound-libs","source":"RHSA-2026:72110"},{"ecosystem":"Red Hat:rhel_tus:8.8::appstream","fixed":["0:1.16.2-5.el8_8.6"],"introduced":["0"],"last_affected":[],"package":"python3-unbound","purl":"pkg:rpm/redhat/python3-unbound","source":"RHSA-2026:72264"}],"prev":{"headline":"Softish C6 Ear Camera and EarVision Android Application Use of Hard-coded Credentials","id":"CVE-2026-81640"},"products":["Unbound"],"published":"2026-09-16","related":[{"cvss_score":9.1,"headline":"Possible arbitrary code execution during DNSSEC validation","id":"CVE-2026-33278","kev_date_added":null,"published":"2026-05-20"},{"cvss_score":8.7,"headline":"Heap overflow with multiple NSID, COOKIE, PADDING EDNS options","id":"CVE-2026-42944","kev_date_added":null,"published":"2026-05-20"},{"cvss_score":8.7,"headline":"Crash during DNSSEC validation of malicious content","id":"CVE-2026-42959","kev_date_added":null,"published":"2026-05-20"},{"cvss_score":8.4,"headline":"CNAME synthesis could lead to heap corruption","id":"CVE-2026-82717","kev_date_added":null,"published":"2026-09-16"},{"cvss_score":7.5,"headline":"Possible heap buffer overflow during DNSSEC canonicalization","id":"CVE-2026-81634","kev_date_added":null,"published":"2026-09-16"},{"cvss_score":7.5,"headline":"Remote DNS-over-QUIC denial of service due to `quic-size` budget bypass","id":"CVE-2026-32665","kev_date_added":null,"published":"2026-07-22"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"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)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-09-16","vendors":["NLnet Labs"]},"summary":"A heap buffer overflow in Unbound's DNSSEC validator allows remote code execution or denial of service via malicious DNSKEY records.","url":"https://insights.sbomify.com/CVE-2026-81642/"}