CVE-2026-81522

A weakness in the MongoDB C++ Driver's handling of caller-supplied namespace identifiers allows special characters embedded in those identifiers. An application that builds a namespace identifier from untrusted input without validating it may therefore have its operation directed at a different target than intended. This can result in limited unauthorized read and write access to data belonging to another logical tenant of the affected application.

CVSS v3 8.1 HIGH

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/mongodb/mongo-cxx-driver/releases/tag/r4.5.1	Product
https://jira.mongodb.org/browse/CXX-3552	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:mongodb:c\+\+_driver:*:*:*:*:*:mongodb:*:*

History

29 Sep 2026, 19:17

Type	Values Removed	Values Added
First Time		Mongodb c\+\+ Driver Mongodb
References	~~() https://github.com/mongodb/mongo-cxx-driver/releases/tag/r4.5.1 -~~	() https://github.com/mongodb/mongo-cxx-driver/releases/tag/r4.5.1 - Product
References	~~() https://jira.mongodb.org/browse/CXX-3552 -~~	() https://jira.mongodb.org/browse/CXX-3552 - Vendor Advisory
CPE		cpe:2.3:a:mongodb:c\+\+_driver::::::mongodb::*

Information

Published : 2026-08-27 20:18

Updated : 2026-09-29 19:17

NVD link : CVE-2026-81522

Mitre link : CVE-2026-81522

CVE.ORG link : CVE-2026-81522

JSON object : View

Products Affected

mongodb

c\+\+_driver

CWE

CWE-116

Improper Encoding or Escaping of Output

{"id": "CVE-2026-81522", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-81522", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-08-28T00:00:00+00:00"}}], "cvssMetricV31": [{"type": "Secondary", "source": "cna@mongodb.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 2.8}], "cvssMetricV40": [{"type": "Secondary", "source": "cna@mongodb.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 8.6, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "cna@mongodb.com", "affectedData": [{"vendor": "MongoDB", "product": "C++ Driver", "versions": [{"status": "affected", "version": "3.0.0", "lessThan": "4.5.1", "versionType": "semver"}], "defaultStatus": "unaffected"}]}], "published": "2026-08-27T20:18:50.493", "references": [{"url": "https://github.com/mongodb/mongo-cxx-driver/releases/tag/r4.5.1", "tags": ["Product"], "source": "cna@mongodb.com"}, {"url": "https://jira.mongodb.org/browse/CXX-3552", "tags": ["Vendor Advisory"], "source": "cna@mongodb.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "cna@mongodb.com", "description": [{"lang": "en", "value": "CWE-116"}]}], "descriptions": [{"lang": "en", "value": "A weakness in the MongoDB C++ Driver's handling of caller-supplied namespace identifiers allows special characters embedded in those identifiers. An application that builds a namespace identifier from untrusted input without validating it may therefore have its operation directed at a different target than intended. This can result in limited unauthorized read and write access to data belonging to another logical tenant of the affected application."}], "lastModified": "2026-09-29T19:17:22.457", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:mongodb:c\\+\\+_driver:*:*:*:*:*:mongodb:*:*", "vulnerable": true, "matchCriteriaId": "38409EF0-6D36-4B98-80A6-A53FA870B1AE", "versionEndExcluding": "4.5.2", "versionStartIncluding": "3.0.0"}], "operator": "OR"}]}], "sourceIdentifier": "cna@mongodb.com"}