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CVE-2026-8202— Post-authentication CPU utilization DoS via $trim/$ltrim/$rtrim operators

Quick assessment

Affected
MongoDB, Inc. MongoDB Server
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 Server是美国MongoDB公司的一套开源的NoSQL数据库。该数据库提供面向集合的存储、动态查询、数据复制及自动故障转移等功能。 MongoDB Server 7.0.34之前版本、8.0.23之前版本、8.2.9之前版本和8.3.2之前版本存在安全漏洞，该漏洞源于使用密集填充的字符掩码和大型输入字符串时，可能导致具有聚合权限的认证用户长时间将CPU利用率固定在100%。

CVSS 4.3 · Medium EPSS 0.45% · P37

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 4

VendorProduct Version RangeStatus
MongoDB, Inc. MongoDB Server 7.0< 7.0.34 affected
8.0< 8.0.23 affected
8.2< 8.2.9 affected
8.3< 8.3.2 affected
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I. Basic Information for CVE-2026-8202

Vulnerability Information
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Vulnerability Title
Post-authentication CPU utilization DoS via $trim/$ltrim/$rtrim operators
Source: CVE Program / CVE List V5
Vulnerability Description
Using a densely populated chars mask and a large input string in the MongoDB aggregation operators $trim, $ltrim, and $rtrim, an authenticated user with aggregation permissions can pin CPU utilization at 100% for an extended period of time. This issue impacts MongoDB Server v7.0 versions prior to 7.0.34, v8.0 versions prior to 8.0.23, v8.2 versions prior to 8.2.9 and v8.3 versions prior to 8.3.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
MongoDB Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MongoDB Server是美国MongoDB公司的一套开源的NoSQL数据库。该数据库提供面向集合的存储、动态查询、数据复制及自动故障转移等功能。 MongoDB Server 7.0.34之前版本、8.0.23之前版本、8.2.9之前版本和8.3.2之前版本存在安全漏洞，该漏洞源于使用密集填充的字符掩码和大型输入字符串时，可能导致具有聚合权限的认证用户长时间将CPU利用率固定在100%。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
MongoDB, Inc. MongoDB Server 7.0 ~ 7.0.34 -

II. Public POCs for CVE-2026-8202

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III. Intelligence Information for CVE-2026-8202

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Patches & Fixes for CVE-2026-8202 (1)

Same Patch Batch · MongoDB, Inc. · 2026-05-13 · 5 CVEs total

CVE-2026-8336 7.5 HIGH Post-authentication use-after-free error in $_internalJsEmit and mapreduce commands
CVE-2026-8199 6.5 MEDIUM Post-auth memory exhaustion via bitwise match expressions
CVE-2026-8201 6.4 MEDIUM Use-After-Free in MongoDB FLE Query Analysis When Processing Positional Projections on Enc
CVE-2026-8200 2.7 LOW Schema validation log messages may not redact user data

IV. Related Vulnerabilities

Same product: MongoDB Server
Same vendor: MongoDB, Inc.
Same weakness: CWE-770

V. Comments for CVE-2026-8202

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