{"id":"CVE-2026-56101","revision":null,"records":[{"revision":"4c870cdbb74a4656a22838187c00ed48","observedAt":"2026-10-27T12:09:21.929+00:00","statement":{"source":"cve-program","id":"CVE-2026-56101","aliases":[],"title":"OpenBSD ieee80211_crypto_tkip.c TKIP MIC Countermeasure Logic Inversion DoS","description":"OpenBSD before commit 1ee99df contains an inverted comparison vulnerability in the ieee80211_michael_mic_failure() function within sys/net80211/ieee80211_crypto_tkip.c that allows unauthenticated attackers within RF range to trigger denial of service by sending two malformed TKIP frames separated by more than 60 seconds. Attackers can exploit the reversed TKIP MIC failure countermeasure window check to deauthenticate all associated TKIP stations and block reassociation for up to 90 seconds, while within-window MIC failures that should engage countermeasures are silently discarded, leaving key-recovery attempts undetected.","state":0,"publishedAt":"2026-09-08T16:00:30.572+00:00","modifiedAt":"2026-10-27T10:14:10.869+00:00","affected":[{"ecosystem":"Vendor product","name":"OpenBSD","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"unaffected\",\n                    \"vendor\": \"OpenBSD\",\n                    \"product\": \"OpenBSD\",\n                    \"packageURL\": \"pkg:github/openbsd/src\",\n                    \"repo\": \"https://github.com/openbsd/src\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"versionType\": \"git\",\n                            \"lessThan\": \"1ee99dfcc4ddc87afc6395d5d3094e9d2314fb5a\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":6,"severity":"MEDIUM"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.3,"severity":"MEDIUM"}],"references":["https://pop.argus-systems.ai/advisory/adv-209.html","https://github.com/openbsd/src/commit/1ee99dfcc4ddc87afc6395d5d3094e9d2314fb5a","https://www.vulncheck.com/advisories/openbsd-ieee80211-crypto-tkip-c-tkip-mic-countermeasure-logic-inversion-dos"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-56101","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-56101","identifiers":["CVE-2026-56101"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-01T09:06:51.4178962+00:00","complete":true,"records":1766,"lastAttemptAt":"2026-11-01T09:06:51.4178962+00:00","lastSuccessAt":"2026-11-01T09:06:51.5881341+00:00","error":null,"lastVerifiedAt":"2026-11-01T09:06:51.5881375+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-aece262bb10a694367a43c24d730aa8e8dc171723eaec4c15cdd32f04bda103f-1b2ad8cecd88ed5df630bc5db125f8546d18e78172c663a436cde2b85b68ac8a","complete":true,"records":417622,"lastAttemptAt":"2026-11-01T09:04:50.9483311+00:00","lastSuccessAt":"2026-11-01T09:04:50.9256571+00:00","error":null,"lastVerifiedAt":"2026-11-01T09:04:50.9483311+00:00","snapshotPublishedAt":"2026-11-01T09:28:45+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-2650ae62b65946e48424df080a8c862a","complete":false,"records":13567,"lastAttemptAt":"2026-11-01T09:09:15.9320286+00:00","lastSuccessAt":"2026-11-01T09:09:15.9983331+00:00","error":null,"lastVerifiedAt":"2026-11-01T09:09:15.9983331+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-01T09:06:51.4178962+00:00","complete":true,"records":1095,"lastAttemptAt":"2026-11-01T09:06:51.4178962+00:00","lastSuccessAt":"2026-11-01T09:06:51.588966+00:00","error":null,"lastVerifiedAt":"2026-11-01T09:06:51.5889662+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-cb479fb73dd0432cb8c82ee43f01837b","complete":true,"records":13580,"lastAttemptAt":"2026-11-01T09:06:52.0921332+00:00","lastSuccessAt":"2026-11-01T04:04:52.54+00:00","error":null,"lastVerifiedAt":"2026-11-01T04:04:52.54+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13637,"expectedIdentifiers":13637,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-21dcd6662970dfea02e4ea60ee637115e8d92664947484d2b9276b3f6568a84f","complete":true,"records":9815,"lastAttemptAt":"2026-11-01T09:06:51.2857236+00:00","lastSuccessAt":"2026-10-30T23:47:34.1817587+00:00","error":null,"lastVerifiedAt":"2026-11-01T09:06:51.2857236+00:00","snapshotPublishedAt":"2026-10-30T23:33:17+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-2de9ccc5290f060c7aa63f89c25dd76f655a64ba1aba7c05c97fa3bee4f09899","complete":true,"records":1967,"lastAttemptAt":"2026-11-01T09:04:50.9955369+00:00","lastSuccessAt":"2026-10-28T20:55:34.2982937+00:00","error":null,"lastVerifiedAt":"2026-11-01T09:04:50.9955369+00:00","snapshotPublishedAt":"2026-10-28T20:03:08+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-f95f76cd406ae5bae3de632ad37fd2d5160b44f5e6b51748ac6f8f0c0c88e72b","complete":true,"records":3028,"lastAttemptAt":"2026-11-01T09:06:51.386713+00:00","lastSuccessAt":"2026-10-30T23:47:38.4914494+00:00","error":null,"lastVerifiedAt":"2026-11-01T09:06:51.386713+00:00","snapshotPublishedAt":"2026-10-30T23:18:12+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-55acacd40a7aab88cf530cfddf98233a5d800cfc6bb1883653ecf5bee50f4426","complete":true,"records":230996,"lastAttemptAt":"2026-11-01T09:06:51.1343605+00:00","lastSuccessAt":"2026-11-01T09:06:49.6961926+00:00","error":null,"lastVerifiedAt":"2026-11-01T09:06:51.1343605+00:00","snapshotPublishedAt":"2026-11-01T08:33:39+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}