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CVE-2026-106436— Application denial of service and data truncation via unchecked BSON append failures in MongoDB PHP Driver

Quick assessment

Affected
MongoDB PHP Driver
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MongoDB PHP 驱动中的 BSON 编码器在文档超过 libbson 的大小限制时，未检查某些函数的返回值。这可能导致编码器进入无效状态。任何未经授权的攻击者，若能诱导受影响的应用程序对异常庞大的数据结构进行编码，即可导致 PHP 工作进程终止，或使生成的文档中遗漏部分字段。此漏洞无需连接 MongoDB 服务器，也无需进行数据库认证。

CVSS 4.8 · Medium

Affected Version Matrix 3

VendorProduct Version RangeStatus
MongoDB PHP Driver 1.3.0< 1.21.11 affected
2.0.0< 2.1.11 affected
2.2.0< 2.5.4 affected
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I. Basic Information for CVE-2026-106436

Vulnerability Information
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Vulnerability Title
Application denial of service and data truncation via unchecked BSON append failures in MongoDB PHP Driver
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加检查的返回值
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MongoDB PHP Driver 1.3.0 ~ 1.21.11 -

II. Public POCs for CVE-2026-106436

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III. Intelligence Information for CVE-2026-106436

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Other References for CVE-2026-106436 (1)

Same Patch Batch · MongoDB · 2026-10-08 · 13 CVEs total

CVE-2026-106433 8.8 HIGH Heap corruption via duplicate masterKey fields in MongoDB libmongocrypt
CVE-2026-106429 6.5 MEDIUM Application denial of service via malformed KMS endpoint in MongoDB libmongocrypt
CVE-2026-106437 6.2 MEDIUM Out-of-bounds read and write via undersized BSON buffer reservation in MongoDB C Driver
CVE-2026-106430 5.9 MEDIUM Query and rename target confusion via embedded NUL truncation in MongoDB C++ Driver
CVE-2026-107325 5.9 MEDIUM Application denial of service via missing BSON array length validation in MongoDB Go Drive
CVE-2026-107324 5.9 MEDIUM Application denial of service via integer overflow in BSON value-length validation in Mong
CVE-2026-106431 5.7 MEDIUM One-byte heap buffer overflow in BSON bulk document writer in MongoDB C Driver
CVE-2026-106435 5.1 MEDIUM Application denial of service via out-of-bounds read in BSON Regex decoding in MongoDB Pyt
CVE-2026-106434 4.3 MEDIUM Unrecognized payload acceptance in explicit decryption in MongoDB libmongocrypt
CVE-2026-106438 4.0 MEDIUM Silent Decimal128 value corruption via incorrect exactness check in MongoDB C Driver
CVE-2026-106428 3.7 LOW Out-of-bounds read in SCRAM response parsing in MongoDB C Driver
CVE-2026-106432 3.6 LOW Heap buffer overflow via 32-bit string-length truncation in MongoDB PHP Driver

IV. Related Vulnerabilities

Same product: PHP Driver
Same vendor: MongoDB
Same weakness: CWE-252

V. Comments for CVE-2026-106436

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