{"id":"CVE-2026-106438","state":"PUBLISHED","title":"Silent Decimal128 value corruption via incorrect exactness check in MongoDB C Driver","description":"An incorrect calculation in Decimal128 string parsing in the MongoDB C Driver can accept certain over-precision inputs containing leading zeros instead of rejecting them. This produces a value different from the supplied text. An actor who can provide a decimal string to an embedding application, including through Extended JSON parsing, can cause the application to store or use an incorrect numeric value.","publishedAt":"2026-10-08T18:44:05.629Z","updatedAt":"2026-10-08T19:21:43.595Z","severity":{"score":5.1,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","source":"mongodb"},"assigner":"mongodb","products":["MongoDB C Driver"],"affected":[{"vendor":"MongoDB","product":"C Driver","defaultStatus":"unaffected","versions":[{"version":"1.4.0","status":"affected","lessThan":"1.30.13","versionType":"semver"},{"version":"2.0.0","status":"affected","lessThan":"2.5.6","versionType":"semver"}]}],"references":["https://jira.mongodb.org/browse/CDRIVER-6419"],"weaknesses":["CWE-682"],"ingestedAt":"2026-10-29T20:10:23.711Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/106xxx/CVE-2026-106438.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-106438","state":"PUBLISHED","datePublished":"2026-10-08T18:44:05.629Z","dateUpdated":"2026-10-08T19:21:43.595Z","assignerShortName":"mongodb","assignerOrgId":"a39b4221-9bd0-4244-95fc-f3e2e07f1deb","dateReserved":"2026-10-06T16:40:40.579Z"},"containers":{"cna":{"title":"Silent Decimal128 value corruption via incorrect exactness check in MongoDB C Driver","descriptions":[{"lang":"en","value":"An incorrect calculation in Decimal128 string parsing in the MongoDB C Driver can accept certain over-precision inputs containing leading zeros instead of rejecting them. This produces a value different from the supplied text. An actor who can provide a decimal string to an embedding application, including through Extended JSON parsing, can cause the application to store or use an incorrect numeric value."}],"affected":[{"vendor":"MongoDB","product":"C Driver","defaultStatus":"unaffected","versions":[{"version":"1.4.0","status":"affected","lessThan":"1.30.13","versionType":"semver"},{"version":"2.0.0","status":"affected","lessThan":"2.5.6","versionType":"semver"}]}],"references":[{"url":"https://jira.mongodb.org/browse/CDRIVER-6419"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","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":5.1,"vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/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":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE","baseSeverity":"MEDIUM","baseScore":4,"vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-682","lang":"en","description":"CWE-682: Incorrect Calculation","type":"CWE"}]}],"providerMetadata":{"shortName":"mongodb","orgId":"a39b4221-9bd0-4244-95fc-f3e2e07f1deb","dateUpdated":"2026-10-08T18:44:05.629Z"},"source":{"discovery":"INTERNAL"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-08T19:20:37.671135Z","id":"CVE-2026-106438","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":"2026-10-08T19:21:43.595Z"}}]}}}