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.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-146965 advisory.

    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.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - The MongoDB C Driver's legacy GridFS API accepts malformed file metadata from the database without
    adequate validation. Crafted documents in a GridFS collection may cause any application that reads those
    files via the legacy API to either crash (via a division-by-zero) or silently leak process memory contents
    (via an out-of-bounds read). (CVE-2026-9100)

  - A compromised third party cloud server or man-in-the-middle attacker could send a malformed HTTP response
    and cause a crash in applications using the MongoDB C driver. (CVE-2026-4359)

  - A weakness in the MongoDB C Driver allows special elements in caller-supplied database and collection name
    components to pass without sanitization when the driver composes the target namespace for an operation. An
    application that incorporates untrusted input into these name components can have operations directed at a
    resource other than the one intended. (CVE-2026-81524)

  - An incorrect numeric conversion in the JSON parsing component of the MongoDB C Driver's BSON library may
    cause an unusually large text value to be silently shortened, or the corresponding field to be omitted,
    while the parsing operation still reports success and returns no error. An unauthenticated party who can
    supply the input processed by an application that uses this component may cause that application to hold
    data that does not match what was submitted, which may result in unintended alteration of data.
    (CVE-2026-84963)

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-f74926c622 advisory.

    ## libmongoc  1.30.9

    Fixes

    -    Fix OCSP error handling. **CVE-2026-84964**
    -    Fix unsafe casts during JSON parsing. **CVE-2026-84965**
    -    Fix possible unsafe truncation when logging base64. **CVE-2026-84969**
    -    Fix unsafe calls to bson_next_power_of_two. **CVE-2026-84963**


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-8ed63cce6b advisory.

    ## libmongoc  1.30.9

    Fixes

    -    Fix OCSP error handling. **CVE-2026-84964**
    -    Fix unsafe casts during JSON parsing. **CVE-2026-84965**
    -    Fix possible unsafe truncation when logging base64. **CVE-2026-84969**
    -    Fix unsafe calls to bson_next_power_of_two. **CVE-2026-84963**


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 45 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-83792d666c advisory.

    ## libmongoc 2.5.2

    Fixes

    -    Fix OCSP error handling. **CVE-2026-84964**
    -    Fix unsafe casts during JSON parsing. **CVE-2026-84965**
    -    Fix possible unsafe truncation when logging base64. **CVE-2026-84969**
    -    Fix unsafe calls to bson_next_power_of_two. **CVE-2026-84963**


    ----

    ## libmongoc 2.5.1

    Fixes

    - Validate database and collection name arguments against . and NUL bytes (**CVE-2026-81524**)


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-84969)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
373792	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: mongo-c-driver (UTSA-2026-146965)	Nessus	Unity Linux Local Security Checks	Local	medium
477562	Alpine: mongo-c-driver: security update to 1.30.14-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	Local	critical
477562	Alpine: mongo-c-driver: security update to 1.30.14-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	Local	critical
349722	Fedora 43 : mongo-c-driver (2026-f74926c622)	Nessus	Fedora Local Security Checks	Local	high
345470	Fedora 44 : mongo-c-driver (2026-8ed63cce6b)	Nessus	Fedora Local Security Checks	Local	high
345458	Fedora 45 : mongo-c-driver (2026-83792d666c)	Nessus	Fedora Local Security Checks	Local	high
342829	Linux Distros Unpatched Vulnerability : CVE-2026-84969	Nessus	Misc.	Local	medium

Detections

Analytics

CVE-2026-84969

medium

Tenable Plugins

medium

critical

critical

high

high

high

medium