A double free in the OpenSSL-based TLS certificate revocation checking path of the MongoDB C Driver can be reached by a TLS endpoint that the client already trusts. During the handshake, specially formed certificate data can cause the same heap object to be released twice. An unauthenticated party acting as the trusted endpoint may cause the connecting client application to terminate unexpectedly.

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 double free in the OpenSSL-based TLS certificate revocation checking path of the MongoDB C Driver can be     reached by a TLS endpoint that the client already trusts. During the handshake, specially formed     certificate data can cause the same heap object to be released twice. An unauthenticated party acting as     the trusted endpoint may cause the connecting client application to terminate unexpectedly.
    (CVE-2026-84964)

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

ID	Name	Product	Family	Type	Severity
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
342818	Linux Distros Unpatched Vulnerability : CVE-2026-84964	Nessus	Misc.	Local	high

Detections

Analytics

CVE-2026-84964

high

Tenable Plugins

high

high

high

high