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    CVE-2026-106434

    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.

    Published:Oct 8, 2026
    Last Modified:Oct 8, 2026
    EPS:Oct 8, 2026
    EPSS Score:
    CVSS Score:4.3

    Affected Products

    Vendor
    Mongodb
    Product
    Libmongocrypt

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-114655 (CVSS 6) — libmongocrypt builds requests to external key management services (AWS, Azure and GCP) by inserting values fro…
    CVE-2026-106433 (CVSS 8.7) — Improper state management in MongoDB libmongocrypt can cause provider-specific data to be treated as an incomp…
    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