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    CVE-2026-106433

    Improper state management in MongoDB libmongocrypt can cause provider-specific data to be treated as an incompatible type when cleaning up a key document containing duplicate masterKey fields. An authenticated actor who can modify key vault documents, or a server that returns such a key document, can cause invalid memory access and invalid frees in the client process. This can terminate the application or corrupt process memory.

    Published:Oct 8, 2026
    Last Modified:Oct 27, 2026
    EPS:Oct 8, 2026
    EPSS Score:0.00267
    CVSS Score:8.8

    Affected Products

    Vendor
    Mongodb
    Product
    Libmongocrypt

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-114655 (CVSS 6) — libmongocrypt builds requests to external key management services (AWS, Azure and GCP) by inserting values fro…
    CVE-2026-106434 (CVSS 5.3) — The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchan…
    CVE-2026-106429 (CVSS 7.1) — An integer underflow in the KMS endpoint-parsing logic of MongoDB libmongocrypt can cause an allocation failur…
    CVE-2026-84962 (CVSS 5.7) — An unauthorized user with key vault write access may cause an authorized client to issue arbitrary authenticat…
    CVE-2026-84971 (CVSS 7.1) — Improper handling of an unexpected value size in the decryption path of a client-side encryption library can c…
    CVE-2026-81523 (CVSS 2) — A missing input-validation issue in MongoDB libmongocrypt's automatic-encryption context setup allows a caller…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High