{"id":"CVE-2026-114643","kind":"vulnerability","aliases":["CVE-2026-114643"],"related":[],"title":"MongoDB C# Driver: GeoJSON extra members can collide with reserved names","description":"The MongoDB C# Driver writes GeoJSON extra members without checking whether their names collide with reserved GeoJSON members such as type and coordinates. An application that places user-supplied field names into these extra members can store documents with duplicate geometry fields, so the server and the driver resolve different values for the same record. Affected records can also become unreadable through the driver, interrupting application code that reads them.","summary":"The MongoDB C# Driver writes GeoJSON extra members without checking whether their names clash with reserved members such as type and coordinates. An application that uses user-supplied field names there can store documents with duplicate geometry fields, so the server and driver read different values and records can become unreadable through the driver.","severity":"medium","cvss":5.4,"epss":0.00372,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["csharp","dotnet","mongodb","package"],"not_affected_if":["no-user-supplied-geojson-fields"],"how_to_check":"- unknown","fix":"- unknown","status":"open","published_at":"2026-10-22T19:17:37+00:00","first_seen_at":"2026-10-23T21:57:31+00:00","triaged_at":"2026-10-25T04:14:21+00:00","updated_at":"2026-10-25T04:14:21+00:00","category":"package","confidence":0.5,"triage":{"at":"2026-10-25T04:14:21Z","model":"claude-haiku-5-5","output":{"fix":"- unknown","reach":"unknown","title":"MongoDB C# Driver: GeoJSON extra members can collide with reserved names","impact":"low","summary":"The MongoDB C# Driver writes GeoJSON extra members without checking whether their names clash with reserved members such as type and coordinates. An application that uses user-supplied field names there can store documents with duplicate geometry fields, so the server and driver read different values and records can become unreadable through the driver.","category":"package","nicknames":[],"who_cares":["mongodb","csharp","dotnet"],"confidence":0.5,"needs_auth":"unknown","worst_case":"Conflicting geometry data stored and records become unreadable via driver","analyst_note":"Find the affected and fixed MongoDB C# Driver versions in the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-114643 or the MongoDB advisory it cites.","how_to_check":"- unknown","needs_analyst":true,"not_affected_if":["no-user-supplied-geojson-fields"],"who_is_affected":"Applications using the MongoDB C# Driver that place user-supplied field names into GeoJSON extra members. Applications that only write fixed GeoJSON geometry, or that do not accept user input into those members, are unlikely to be exposed; the sources do not name affected driver versions.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.00059,"input_tokens":3382,"output_tokens":503,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-114643':14A,17A '-2026':13A,16A 'affect':133C 'also':136C 'applic':45B,101C,143C 'becom':72B,137C 'c':2A,24B,79C 'check':31B,86C 'clash':35B 'code':144C 'collid':8A,90C 'coordin':43B,99C 'csharp':18B 'cve':12A,15A 'differ':67B,127C 'document':56B,115C 'dotnet':19B 'driver':3A,25B,65B,76B,80C,125C,141C 'duplic':58B,117C 'extra':5A,28B,83C,111C 'field':51B,60B,107C,119C 'geojson':4A,27B,82C,93C 'geometri':59B,118C 'interrupt':142C 'member':6A,29B,38B,84C,94C,112C 'mongodb':1A,20B,23B,78C 'name':11A,34B,52B,89C,108C 'packag':21B 'place':103C 'read':66B,146C 'record':70B,132C,134C 'reserv':10A,37B,92C 'resolv':126C 'server':63B,122C 'store':55B,114C 'suppli':50B,106C 'type':41B,97C 'unread':73B,138C 'use':47B 'user':49B,105C 'user-suppli':48B,104C 'valu':68B,128C 'whether':32B,87C 'without':30B,85C 'write':26B,81C","nicknames":[],"mitigations":[],"who_affected":"Applications using the MongoDB C# Driver that place user-supplied field names into GeoJSON extra members. Applications that only write fixed GeoJSON geometry, or that do not accept user input into those members, are unlikely to be exposed; the sources do not name affected driver versions.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-22T19:17:37+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"cna@mongodb.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-114643","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-114643","severity":null,"published_at":"2026-10-22T19:17:37+00:00","modified_at":"2026-10-23T19:45:03+00:00","first_seen_at":"2026-10-23T21:57:31+00:00","fetched_at":"2026-10-23T22:29:02+00:00","note":null},{"source":"epss","external_id":"CVE-2026-114643","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-114643","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-24T07:15:51+00:00","fetched_at":"2026-10-24T07:15:51+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}