MongoDB PHP Driver up to 1.21.10/2.1.10/2.5.3 BSON Encoder return value

Summaryinfo

A vulnerability identified as critical has been detected in MongoDB PHP Driver up to 1.21.10/2.1.10/2.5.3. Affected is an unknown function of the component BSON Encoder. Performing a manipulation results in return value. This vulnerability is reported as CVE-2026-106436. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in MongoDB PHP Driver up to 1.21.10/2.1.10/2.5.3. This affects some unknown functionality of the component BSON Encoder. The manipulation with an unknown input leads to a return value vulnerability. CWE is classifying the issue as CWE-252. The product does not check the return value from a method or function, which can prevent it from detecting unexpected states and conditions. This is going to have an impact on integrity, and availability. The summary by CVE is:

The BSON encoder in the MongoDB PHP Driver does not check some return values after a document exceeds libbson's size limit. This can leave the encoder in an invalid state. An unauthenticated actor who can cause an affected application to encode an unusually large data structure can terminate the PHP worker or cause the resulting document to omit fields. No MongoDB server connection or database authentication is required.

The advisory is shared at jira.mongodb.org. This vulnerability is uniquely identified as CVE-2026-106436 since 10/06/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available.

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

CPE 2.3info

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• 🔒
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CPE 2.2info

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