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CVE-2026-81523— Cross-tenant database retargeting via dot/NUL injection in namespace strings in 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 libmongocrypt 在自动加密上下文初始化过程中存在输入验证缺失问题，导致调用方提供的数据库标识符未经过清洗（sanitization）即被接受。该漏洞的影响范围有限，主要表现为不正确的 schema 选择，可能导致应用程序所处理的信息发生有限的泄露或篡改。

CVSS 4.4 · Medium
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I. Basic Information for CVE-2026-81523

Vulnerability Information
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Vulnerability Title
Cross-tenant database retargeting via dot/NUL injection in namespace strings in libmongocrypt
Source: CVE Program / CVE List V5
Vulnerability Description
A missing input-validation issue in MongoDB libmongocrypt's automatic-encryption context setup allows a caller-supplied database identifier to be accepted without sanitization. The resulting impact is limited to incorrect schema selection, which may lead to limited disclosure or modification of information handled by the application.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输出中的特殊元素转义处理不恰当(注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MongoDB libmongocrypt 1.0.0 ~ 1.20.3 -

II. Public POCs for CVE-2026-81523

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III. Intelligence Information for CVE-2026-81523

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Vendor Pages for CVE-2026-81523 (1)

Same Patch Batch · MongoDB · 2026-08-27 · 12 CVEs total

CVE-2026-81522 8.1 HIGH Cross-tenant database retargeting via dot/NUL injection in namespace strings in the C++ Dr
CVE-2026-81525 8.1 HIGH Cross-tenant database retargeting via dot/NUL injection in namespace strings in the PHP Dr
CVE-2026-81529 7.1 HIGH Connection-option injection via unescaped settings in the canonical MongoDB URL builder
CVE-2026-81521 6.5 MEDIUM Cross-database write retargeting via unvalidated dotted database name in Client.BulkWrite
CVE-2026-81527 6.5 MEDIUM NoSQL injection via unquoted constant GroupBy keys in LINQ pipeline translation
CVE-2026-81526 6.5 MEDIUM Cross-database write redirection via unvalidated dotted database name in bulk write namesp
CVE-2026-75159 5.9 MEDIUM MongoDB BI Connector Improper Memory Handling During Failed Kerberos Authentication May Ca
CVE-2026-81530 5.6 MEDIUM KMS master key exposure via unredacted credential serialization in driver settings string
CVE-2026-81528 5.4 MEDIUM NoSQL injection via array replacement bypassing update shape validation in driver write pa
CVE-2026-81524 5.4 MEDIUM Cross-tenant database retargeting via dot/NUL injection in namespace strings in the C Driv
CVE-2026-75573 4.4 MEDIUM MongoDB Connector for BI mongodrdl Logs TLS Private-Key Password When Duplicate Options Ar

IV. Related Vulnerabilities

Same vendor: MongoDB
Same weakness: CWE-74

V. Comments for CVE-2026-81523

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