MongoDB PHP Driver up to 1.21.10/2.1.10/2.5.3 BSON encoder heap-based overflow

Summaryinfo

A vulnerability labeled as very critical has been found in MongoDB PHP Driver up to 1.21.10/2.1.10/2.5.3. Affected by this vulnerability is an unknown functionality of the component BSON encoder. Executing a manipulation can lead to heap-based overflow. This vulnerability appears as CVE-2026-106432. The attack may be performed from remote. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as very critical was found in MongoDB PHP Driver up to 1.21.10/2.1.10/2.5.3. This vulnerability affects an unknown part of the component BSON encoder. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is 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(). As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The BSON encoder in the MongoDB PHP Driver converts a string length to a 32-bit value without validation. When an affected application encodes a string near 4 GiB, the allocation size can wrap while the copy operation uses the original length. The resulting heap buffer overflow can corrupt process memory or terminate the PHP process. Reaching this issue requires a non-default runtime configuration that permits multi-gigabyte values. No MongoDB server interaction is required.

The advisory is available at jira.mongodb.org. This vulnerability was named CVE-2026-106432 since 10/06/2026. The exploitation appears to be easy. The attack can be initiated remotely. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/08/2026).

Upgrading to version 1.21.11, 2.1.11 or 2.5.4 eliminates this vulnerability.

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Productinfo

Type

• Database Software

Vendor

• MongoDB

Name

• PHP Driver

Version

• 1.21.0
• 1.21.1
• 1.21.2
• 1.21.3
• 1.21.4
• 1.21.5
• 1.21.6
• 1.21.7
• 1.21.8
• 1.21.9
• 1.21.10
• 2.1.0
• 2.1.1
• 2.1.2
• 2.1.3
• 2.1.4
• 2.1.5
• 2.1.6
• 2.1.7
• 2.1.8
• 2.1.9
• 2.1.10
• 2.5.0
• 2.5.1
• 2.5.2
• 2.5.3

License

• open-source

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CPE 2.2info

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