CVE Feed

    Dashboard / CVE / CVE-2026-84969

    CVE-2026-84969

    A memory-handling error in the BSON-to-JSON conversion helpers of the MongoDB C Driver can write a small number of bytes past the end of a heap buffer when a binary field is encoded and the output is cut short at a caller-configured length limit. A party who supplies the document content, with no privileges on the application that links the driver, may cause a small amount of data outside the intended buffer to be altered.

    Published:Sep 3, 2026
    Last Modified:Sep 3, 2026
    EPS:Sep 3, 2026
    EPSS Score:
    CVSS Score:3.7

    Affected Products

    Vendor
    Mongodb
    Product
    C Driver

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-787 Out-of-bounds Write

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-84963 (CVSS 6.3) — An incorrect numeric conversion in the JSON parsing component of the MongoDB C Driver's BSON library may cause…
    CVE-2026-84964 (CVSS 8.2) — A double free in the OpenSSL-based TLS certificate revocation checking path of the MongoDB C Driver can be rea…
    CVE-2026-84965 (CVSS 5.9) — An integer wraparound in an allocation size calculation in the BSON library's JSON parsing code can cause a bu…
    CVE-2026-81524 (CVSS 5.3) — A weakness in the MongoDB C Driver allows special elements in caller-supplied database and collection name com…
    CVE-2026-9100 (CVSS 6) — The MongoDB C Driver's legacy GridFS API accepts malformed file metadata from the database without adequate va…
    CVE-2026-6691 (CVSS 8.6) — The MongoDB C Driver's Cyrus SASL integration performs unsafe string copying during username canonicalization,…
    CVE-2026-6231 (CVSS 5.3) — The bson_validate function may return early on specific inputs and incorrectly report success. This behavior c…
    CVE-2026-4359 (CVSS 2) — A compromised third party cloud server or man-in-the-middle attacker could send a malformed HTTP response and …
    CVE-2025-14911 (CVSS 7.1) — User-controlled chunkSize metadata from MongoDB lacks appropriate validation allowing malformed GridFS metadat…
    CVE-2025-12119 (CVSS 6.9) — A mongoc_bulk_operation_t may read invalid memory if large options are passed.…

    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