{"id":"CVE-2026-41292","details":"NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to a degradation of service attack related to parsing long lists of incoming EDNS options. An adversary sending queries with too many EDNS options can hold Unbound threads hostage while they are parsing and creating internal data structures for the options. Coordinated attacks can result in degradation and/or denial of service. Unbound 1.25.1 contains a patch with a fix to limit acceptable incoming EDNS options (100).","modified":"2026-06-12T08:59:13.038250872Z","published":"2026-05-20T10:16:27.327Z","related":["SUSE-SU-2026:21874-1","SUSE-SU-2026:21913-1","SUSE-SU-2026:2281-1","SUSE-SU-2026:2369-1","openSUSE-SU-2026:10903-1"],"references":[{"type":"ADVISORY","url":"https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-41292.txt"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/nlnetlabs/unbound","events":[{"introduced":"0"},{"fixed":"75b6dba593d4fff000434cd64807c6ebd50bd244"}],"database_specific":{"source":"CPE_RANGE","extracted_events":[{"introduced":"0"},{"fixed":"1.25.1"}],"cpe":"cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:*"}}],"versions":["release-1.25.0","release-1.25.0rc1","release-1.24.0","release-1.24.0rc1","release-1.23.0rc1","release-1.22.0","release-1.22.0rc1","release-1.21.0","release-1.21.0rc1","release-1.20.0rc1","release-1.20.0","release-1.19.3rc1","release-1.19.0rc1","release-1.19.0","release-1.18.0","release-1.18.0rc1","release-1.16.2","release-1.16.1rc1","release-1.16.1","release-1.16.0rc1","release-1.16.0","release-1.15.0rc1","release-1.15.0","release-1.14.0rc1","release-1.14.0","release-1.13.2","release-1.13.2rc1","release-1.13.1rc2","release-1.13.1","release-1.13.1rc1","release-1.13.0rc4","release-1.13.0rc3","release-1.13.0rc2","release-1.13.0rc1","release-1.12.0rc1","release-1.12.0","release-1.11.0rc1","release-1.11.0","1.11.0rc1","release-1.10.0rc2","release-1.10.0rc1","release-1.9.6","release-1.9.6rc1","release-1.9.3rc2","release-1.9.3","release-1.9.3rc1","release-1.9.2","release-1.9.2rc3","release-1.9.2rc1","release-1.9.2rc2","final-svn-state","release-1.9.1rc1","release-1.9.0rc1","release-1.8.2rc1","release-1.8.1rc1","release-1.8.0rc1","release-1.7.3rc1","release-1.7.2rc1","release-1.7.1rc1","release-1.7.0rc3","release-1.7.0rc2","release-1.7.0rc1","release-1.6.7","release-1.6.7rc1","release-1.6.6rc2","release-1.6.6rc1","release-1.6.4rc2","release-1.6.4rc1","release-1.6.2rc1","release-1.6.1rc3","release-1.6.1rc2","release-1.6.1rc1","release-1.6.0rc1","release-1.5.10rc1","release-1.5.10","release-1.5.9rc1","release-1.5.8rc1","release-1.5.8","release-1.5.7","release-1.5.6","release-1.5.6rc1","release-1.5.5","release-1.5.5rc1","release-1.5.4rc1","release-1.5.4","release-1.5.3rc1","release-1.5.2","release-1.5.2rc1","release-1.5.1","release-1.5.1rc2","release-1.5.1rc1","release-1.5.0rc1","release-1.4.22","release-1.4.22rc1","release-1.4.20","release-1.4.19","release-1.4.19rc1","release-1.4.18rc2","release-1.4.18rc1","release-1.4.17","release-1.4.17rc1","release-1.4.14","release-1.4.14rc1","release-1.4.13","release-1.4.13rc2","release-1.4.13rc1","release-1.4.12rc1","release-1.4.11rc3","release-1.4.11","release-1.4.11rc2","release-1.4.11rc1","release-1.4.9","release-1.4.9rc1","release-1.4.8rc1","release-1.4.7","release-1.4.7rc1","release-1.4.6","release-1.4.6rc1","release-1.4.5","release-1.4.5rc1","release-1.4.4","release-1.4.4rc1","release-1.4.3","release-1.4.2","release-1.4.1","release-1.4.0","release-1.4.0rc1","release-1.3.3","release-1.3.3rc1","release-1.3.2","release-1.3.1","release-1.1.1","release-1.0.1","release-0.11","release-0.10","release-0.8","release-0.7","release-0.6","release-0.5","release-0.4","release-0.3","release-0.1","release-0.0"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-41292.json","vanir_signatures_modified":"2026-05-31T03:35:35Z","vanir_signatures":[{"target":{"file":"services/rpz.c","function":"rpz_callback_from_iterator_module"},"source":"https://github.com/nlnetlabs/unbound/commit/75b6dba593d4fff000434cd64807c6ebd50bd244","digest":{"length":1502,"function_hash":"26148135886169857913239956572075736548"},"signature_version":"v1","signature_type":"Function","id":"CVE-2026-41292-7cb89fac","deprecated":false},{"id":"CVE-2026-41292-a3b17d2e","source":"https://github.com/nlnetlabs/unbound/commit/75b6dba593d4fff000434cd64807c6ebd50bd244","digest":{"threshold":0.9,"line_hashes":["108481287081154918060659085654141150584","73953166938600086918224773195867549742","15251087855327528788980657535362970158","48532896601082718174781974683716349061","287248990686482337183326495344180868363","112058947495561481565691171486557666856","238258467286774268681997190612827183971","126648031849056156900266153546629664662","335401097143186200364020904286165936708","336096779053276656395004922884987906159","248876396313049466881138460638611830858","293135123655960925553682804594622081358","298612071867479354827766089224387452786","217265304546593372824910550975155656654","13292601781282786772501437491204364169","281286782737850123600796590480125479595","74511316679551775089931390035715335201","161066344018382590627892027575409612852","226343512543910522766563315515650712879"]},"deprecated":false,"target":{"file":"services/rpz.c"},"signature_type":"Line","signature_version":"v1"}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}