{"id":"CVE-2026-118173","revision":null,"records":[{"revision":"5f974758ebc047e28ebf726f45907058","observedAt":"2026-10-27T19:45:55.783+00:00","statement":{"source":"cve-program","id":"CVE-2026-118173","aliases":[],"title":"MISP Guard Incomplete Tag Validation Allows Non-Allowed Taxonomy Tags to Bypass Feed Policy Enforcement","description":"MISP Guard, a proxy that enforces security policies on MISP feed data, contained an incomplete validation check for required taxonomy tags. When a feed event or its attributes carried tags belonging to a required taxonomy (for example, TLP), the guard only verified that at least one tag of that taxonomy matched the configured allowed list. It did not verify that every tag of the required taxonomy present on the event or attribute was in the allowed list. As a result, an event or attribute could simultaneously carry an allowed tag (e.g., tlp:clear) and a non-allowed tag (e.g., tlp:red or tlp:amber) and still pass the guard's policy check. This allowed data marked with a higher classification or sensitivity level to be distributed through feeds configured to only distribute lower-classification data, effectively bypassing the intended data-handling restrictions. The vulnerability affected both event-level and attribute-level tag validation, including attributes nested within objects and shadow attributes. An attacker with the ability to author or modify MISP events in a feed source could include non-allowed taxonomy tags alongside allowed ones to exfiltrate more sensitive data to feed consumers than the guard policy intended to permit.","state":0,"publishedAt":"2026-10-27T18:11:51.815+00:00","modifiedAt":"2026-10-27T18:11:51.815+00:00","affected":[{"ecosystem":"Vendor product","name":"misp-guard","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"cpes\": [\n                        \"cpe:2.3:a:misp:misp-guard:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"modules\": [\n                        \"src/mispguard.py\"\n                    ],\n                    \"product\": \"misp-guard\",\n                    \"programFiles\": [\n                        \"src/mispguard.py\"\n                    ],\n                    \"repo\": \"https://github.com/MISP/misp-guard\",\n                    \"vendor\": \"MISP\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"1.4\",\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N","score":6.1,"severity":"MEDIUM"}],"references":["https://github.com/MISP/misp-guard/commit/6127d94c350e4dfe31fd4426ba26f51294ed3867"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-118173","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-118173","identifiers":["CVE-2026-118173"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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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-63f69305b6a343b791b305fac5c9c952","complete":false,"records":13533,"lastAttemptAt":"2026-10-30T21:57:59.5096056+00:00","lastSuccessAt":"2026-10-30T21:57:59.506+00:00","error":"80 identifier lookups failed; latest failures include request timeout. Other identifiers were checked independently.","lastVerifiedAt":"2026-10-30T21:57:59.506+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13422,"expectedIdentifiers":13605,"failedIdentifiers":80},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-10-30T21:45:26.8921006+00:00","complete":true,"records":1094,"lastAttemptAt":"2026-10-30T21:45:26.8921006+00:00","lastSuccessAt":"2026-10-30T21:45:27.0572356+00:00","error":null,"lastVerifiedAt":"2026-10-30T21:45:27.0572357+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. 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