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    CVE-2026-88035

    A size check in the client-side authentication path of the MongoDB C Driver can wrap around, so an unusually large user-name value is accepted and copied past the end of a small buffer. A party able to set the driver's connection settings may cause the application that embeds the driver to terminate unexpectedly. Reaching this code requires a build in which the optional external SASL authentication backend is present and a connection configured to use it.

    Published:Sep 10, 2026
    Last Modified:Sep 11, 2026
    EPS:Sep 10, 2026
    EPSS Score:
    CVSS Score:4.7

    Affected Products

    Vendor
    Mongodb
    Product
    C Driver

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-190 Integer Overflow or Wraparound

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    Related CVEs

    CVE-2026-88036 (CVSS 6.1) — Improper neutralization of special elements in data query logic in the GridFS component of the MongoDB C Drive…
    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-2026-84969 (CVSS 6.3) — A memory-handling error in the BSON-to-JSON conversion helpers of the MongoDB C Driver can write a small numbe…
    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 …

    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