MongoDB C Driver up to 2.4.0 TLS Transport Layer heap-based overflow

Summaryinfo

A vulnerability classified as very critical has been found in MongoDB C Driver up to 2.4.0. This affects an unknown function of the component TLS Transport Layer. The manipulation leads to heap-based overflow. This vulnerability is listed as CVE-2026-93393. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in MongoDB C Driver up to 2.4.0. This issue affects some unknown processing of the component TLS Transport Layer. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A heap-based buffer overflow exists in the TLS transport layer of the MongoDB C Driver when built with the Windows platform TLS backend. A remote endpoint that the client connects to, or an attacker able to impersonate or redirect the client's connection, can cause the driver to write attacker-supplied data outside the bounds of a heap allocation while processing incoming encrypted traffic. No authentication or user interaction is required, because the affected processing occurs before any application-level authentication completes. Successful exploitation may lead to memory corruption in the client process, disclosure of adjacent heap memory, or termination of the process.

It is possible to read the advisory at jira.mongodb.org. The identification of this vulnerability is CVE-2026-93393 since 09/17/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/17/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Database Software

Vendor

• MongoDB

Name

• C Driver

Version

• 1.24.0
• 1.24.1
• 1.24.2
• 1.24.3
• 1.24.4
• 1.25.0
• 1.25.1
• 1.25.2
• 1.25.3
• 1.25.4
• 1.26.0
• 1.26.1
• 1.26.2
• 1.27.0
• 1.27.1
• 1.27.2
• 1.27.3
• 1.27.4
• 1.27.5
• 1.27.6
• 1.28.0
• 1.28.1
• 1.29.0
• 1.29.1
• 1.29.2
• 1.30.0
• 1.30.1
• 1.30.2
• 1.30.3
• 1.30.4
• 1.30.5
• 1.30.6
• 1.30.7
• 1.30.8
• 2.0
• 2.0.0
• 2.0.1
• 2.0.2
• 2.1
• 2.1.0
• 2.1.1
• 2.1.2
• 2.2
• 2.2.0
• 2.2.1
• 2.2.2
• 2.2.3
• 2.2.4
• 2.3
• 2.3.0
• 2.3.1
• 2.3.2
• 2.3.3
• 2.4.0

License

• open-source

CPE 2.3info

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CPE 2.2info

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