{"schema":"threatline.record/2","record":{"id":"CVE-2026-106434","aliases":[],"summary":"Unrecognized payload acceptance in explicit decryption in MongoDB libmongocrypt","details":"The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error. An actor who can modify stored encrypted fields, such as a database writer, server, or network intermediary, can cause an affected application to process the supplied bytes as decrypted plaintext.","categories":["Databases"],"product":"libmongocrypt","vendor":"MongoDB","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-106434","source_modified_at":"2026-10-08T19:30:49.513Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"libmongocrypt","vendor":"MongoDB","versions":[{"status":"affected","version":"1.5.0","lessThan":"1.20.5","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-106434","source_modified_at":"2026-10-08T19:30:49.513Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"libmongocrypt","ecosystem":null},"version":"1.20.5","basis":"first unaffected version stated in the CVE record"}],"cvss":5.3,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00112,"percentile":0.01319,"score_date":"2026-10-23"},"published_at":"2026-10-08T18:56:43.244Z","modified_at":"2026-10-08T19:30:49.513Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-106434","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-08T19:30:49.513Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-106434","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://jira.mongodb.org/browse/MONGOCRYPT-966"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"partial","assessed_at":"2026-10-08T19:30:38.647440Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"vendor and product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-08T19:30:49.513Z","content_hash":"c180a2b8a1dc8275ed3587f6a66d889cf5e0c431fed2b42f3c8cfba21013010a"}}