{"id":"CLSA-2026-1791261872","summary":"unbound: Fix of 4 CVEs","details":"- CVE-2026-81634: bounds-check the scratch buffer in rrset_canonical() and\n  rrset_canonicalize_to_buffer() before writing the RRSIG rdata, the first\n  canonical owner name and each RR's rdata, so a large rrset can no longer\n  be written past the end of the buffer\n- CVE-2026-80225: cap the number of pipelined TCP/DoT queries drained per\n  event-loop visit in tcp_req_info_read_again() and tcp_more_read_again()\n  and defer the remainder via a zero-delay timer, so one connection can no\n  longer starve the other file descriptors\n- CVE-2026-85501: bound the DNSSEC validation work per query (ReTrap): add\n  the val-validation-attempts and val-hash-attempts limits (default 32),\n  limit DNSKEY/RRSIG and DS key-tag matches and the NSEC/NSEC3 records\n  checked per message, shorten oversized referral DS RRsets, stop validator\n  restarts once the limits are hit, and require only the answer and\n  authority sections to be secure; the built-in val-clean-additional\n  default is now no, the shipped unbound.conf keeps val-clean-additional: yes","modified":"2026-10-26T09:43:32.552617974Z","published":"2026-10-19T14:45:10Z","upstream":["CVE-2026-80225","CVE-2026-81634","CVE-2026-85501"],"references":[{"type":"ADVISORY","url":"https://errata.tuxcare.com/els_os/centos-stream8els/CLSA-2026-1791261872.html"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-50387"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80225"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81634"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-85501"}],"affected":[{"package":{"name":"python3-unbound","ecosystem":"TuxCare:CentOS-Stream:8","purl":"pkg:rpm/tuxcare/python3-unbound?distro=centos-stream-8"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.16.2-5.el8.tuxcare.els12"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos-stream8els/CLSA-2026-1791261872.json"}},{"package":{"name":"unbound","ecosystem":"TuxCare:CentOS-Stream:8","purl":"pkg:rpm/tuxcare/unbound?distro=centos-stream-8"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.16.2-5.el8.tuxcare.els12"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos-stream8els/CLSA-2026-1791261872.json"}},{"package":{"name":"unbound-devel","ecosystem":"TuxCare:CentOS-Stream:8","purl":"pkg:rpm/tuxcare/unbound-devel?distro=centos-stream-8"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.16.2-5.el8.tuxcare.els12"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos-stream8els/CLSA-2026-1791261872.json"}},{"package":{"name":"unbound-libs","ecosystem":"TuxCare:CentOS-Stream:8","purl":"pkg:rpm/tuxcare/unbound-libs?distro=centos-stream-8"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.16.2-5.el8.tuxcare.els12"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos-stream8els/CLSA-2026-1791261872.json"}}],"schema_version":"1.9.0"}