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CVE-2026-106435— Application denial of service via out-of-bounds read in BSON Regex decoding in MongoDB Python Driver

Quick assessment

Affected
MongoDB Python 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 Python 驱动程序的二进制加速器在解码包含截断正则表达式元素且缺少末尾 NUL 字节的畸形 BSON 数据时，可能会出现缓冲区外读取的情况。攻击者若能够向文档中描述的 或 API 提供恶意构造的 BSON 数据，并且在加载了 C 扩展的情况下，可能导致应用程序进程终止。需要注意的是，驱动程序的正常数据库 Wire 协议路径不会执行到此段问题代码。

CVSS 5.1 · Medium

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-106435

Vulnerability Information
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Vulnerability Title
Application denial of service via out-of-bounds read in BSON Regex decoding in MongoDB Python Driver
Source: CVE Program / CVE List V5
Vulnerability Description
The MongoDB Python Driver's binary accelerator can read outside a buffer when an application decodes malformed BSON containing a truncated regular-expression element without a trailing NUL byte. An actor who can supply BSON to the documented decode or decode_all API can cause the application process to terminate when the C extension is loaded. The driver's normal database wire-protocol path does not reach this code.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MongoDB Python Driver 0.10.3 ~ 4.18.2 -

II. Public POCs for CVE-2026-106435

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III. Intelligence Information for CVE-2026-106435

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Other References for CVE-2026-106435 (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-2026-106436 4.8 MEDIUM Application denial of service and data truncation via unchecked BSON append failures in Mo
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: Python Driver
Same vendor: MongoDB
Same weakness: CWE-125

V. Comments for CVE-2026-106435

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