{"id":"CVE-2026-106434","state":"PUBLISHED","title":"Unrecognized payload acceptance in explicit decryption in MongoDB libmongocrypt","description":"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.","publishedAt":"2026-10-08T18:56:43.244Z","updatedAt":"2026-10-08T19:30:49.513Z","severity":{"score":5.3,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","source":"mongodb"},"assigner":"mongodb","products":["MongoDB libmongocrypt"],"affected":[{"vendor":"MongoDB","product":"libmongocrypt","defaultStatus":"unaffected","versions":[{"version":"1.5.0","status":"affected","lessThan":"1.20.5","versionType":"semver"}]}],"references":["https://jira.mongodb.org/browse/MONGOCRYPT-966"],"weaknesses":["CWE-354"],"ingestedAt":"2026-10-29T20:10:23.711Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/106xxx/CVE-2026-106434.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-106434","state":"PUBLISHED","datePublished":"2026-10-08T18:56:43.244Z","dateUpdated":"2026-10-08T19:30:49.513Z","assignerShortName":"mongodb","assignerOrgId":"a39b4221-9bd0-4244-95fc-f3e2e07f1deb","dateReserved":"2026-10-06T16:40:35.016Z"},"containers":{"cna":{"title":"Unrecognized payload acceptance in explicit decryption in MongoDB libmongocrypt","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"MongoDB","product":"libmongocrypt","defaultStatus":"unaffected","versions":[{"version":"1.5.0","status":"affected","lessThan":"1.20.5","versionType":"semver"}]}],"references":[{"url":"https://jira.mongodb.org/browse/MONGOCRYPT-966"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"MEDIUM","baseScore":5.3,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE","baseSeverity":"MEDIUM","baseScore":4.3,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-354","lang":"en","description":"CWE-354: Improper Validation of Integrity Check Value","type":"CWE"}]}],"providerMetadata":{"shortName":"mongodb","orgId":"a39b4221-9bd0-4244-95fc-f3e2e07f1deb","dateUpdated":"2026-10-08T18:56:43.244Z"},"source":{"discovery":"INTERNAL"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-08T19:30:38.647440Z","id":"CVE-2026-106434","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-08T19:30:49.513Z"}}]}}}