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CVE-2026-106433— Heap corruption via duplicate masterKey fields in MongoDB libmongocrypt

Quick assessment

Affected
MongoDB libmongocrypt
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 的 libmongocrypt 库中存在状态管理不当的问题，可能导致在处理包含重复 masterKey 字段的密钥文档时，特定于提供程序的数据被错误地视为不兼容类型。具有权限修改密钥库文档的已认证用户，或返回此类密钥文档的服务器，可导致客户端进程发生无效内存访问和无效释放操作。这可能终止应用程序运行或损坏进程内存。

CVSS 8.8 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
MongoDB libmongocrypt 1.1.0< 1.20.5 affected
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I. Basic Information for CVE-2026-106433

Vulnerability Information
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Vulnerability Title
Heap corruption via duplicate masterKey fields in MongoDB libmongocrypt
Source: CVE Program / CVE List V5
Vulnerability Description
Improper state management in MongoDB libmongocrypt can cause provider-specific data to be treated as an incompatible type when cleaning up a key document containing duplicate masterKey fields. An authenticated actor who can modify key vault documents, or a server that returns such a key document, can cause invalid memory access and invalid frees in the client process. This can terminate the application or corrupt process memory.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用不兼容类型访问资源(类型混淆)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MongoDB libmongocrypt 1.1.0 ~ 1.20.5 -

II. Public POCs for CVE-2026-106433

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III. Intelligence Information for CVE-2026-106433

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Other References for CVE-2026-106433 (1)

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

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-2026-106436 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: libmongocrypt
Same vendor: MongoDB
Same weakness: CWE-843

V. Comments for CVE-2026-106433

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