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CVE-2026-13077— Out-of-Bounds Heap Read in BSON CodeWScope Element Parsing via Malformed BSONColumn Data

Quick assessment

Affected
MongoDB 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公司开源的一套开源的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 7.0.39之前版本、8.0.28之前版本、8.2.12之前版本和8.3.7之前版本存在缓冲区错误漏洞，该漏洞源于BSON CodeWScope元素访问器缺少边界检查，可能导致通过特制聚合管道触发越界堆读取。该漏洞可由通过验证的用户生成包含CodeWScope元素的畸形BSONColumn数据，从而绕过线级BSON验证。当

CVSS 7.1 · High EPSS 0.42% · P34

Affected Version Matrix 4

VendorProduct Version RangeStatus
MongoDB MongoDB Server 7.0< 7.0.39 affected
8.0< 8.0.28 affected
8.2.0< 8.2.12 affected
8.3.0< 8.3.7 affected
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I. Basic Information for CVE-2026-13077

Vulnerability Information
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Vulnerability Title
Out-of-Bounds Heap Read in BSON CodeWScope Element Parsing via Malformed BSONColumn Data
Source: CVE Program / CVE List V5
Vulnerability Description
A missing bounds check in the BSON CodeWScope element accessors allows an attacker to trigger an out-of-bounds heap read via a crafted aggregation pipeline. The vulnerability can be exploited by an authenticated user by generating a malformed BSONColumn data containing a CodeWScope element, bypassing wire-level BSON validation. When the forged element is decompressed, the unchecked size value is used in pointer arithmetic, causing either a server crash or disclosure of adjacent heap memory contents.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
MongoDB Server 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MongoDB Server是美国MongoDB公司开源的一套开源的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 7.0.39之前版本、8.0.28之前版本、8.2.12之前版本和8.3.7之前版本存在缓冲区错误漏洞，该漏洞源于BSON CodeWScope元素访问器缺少边界检查，可能导致通过特制聚合管道触发越界堆读取。该漏洞可由通过验证的用户生成包含CodeWScope元素的畸形BSONColumn数据，从而绕过线级BSON验证。当
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 MongoDB Server 7.0 ~ 7.0.39 -

II. Public POCs for CVE-2026-13077

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III. Intelligence Information for CVE-2026-13077

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Patches & Fixes for CVE-2026-13077 (1)

Same Patch Batch · MongoDB · 2026-07-22 · 26 CVEs total

CVE-2026-13059 8.1 HIGH Improper Validation of Client-Supplied Command Parameters Allowing Role-Based Access Contr
CVE-2026-13072 8.1 HIGH MongoDB Improper Input Validation in Compute Mode External Data Processing Leading to Memo
CVE-2026-14881 7.8 HIGH Compass connection import allows to override OIDC browser open command (usually set throug
CVE-2026-13078 7.7 HIGH Local File Disclosure in MongoDB Server via MozJS Scripting Engine Module Loader
CVE-2026-13058 7.1 HIGH Transaction Command Insufficient Input Validation Leading to Process Termination
CVE-2026-13056 6.5 MEDIUM A user with read access can cause a DoS by executing a specifically crafted query to consu
CVE-2026-13062 6.5 MEDIUM MongoDB mongos Improper Validation of Internal Flags in Queryable Encryption Write Command
CVE-2026-13060 6.5 MEDIUM $graphLookup Aggregation Stage Authorization Check Inconsistency Allowing Unauthorized Col
CVE-2026-13066 6.5 MEDIUM Server-Side JavaScript DBPointer BSON Serialization Memory Disclosure
CVE-2026-13075 6.5 MEDIUM $rankFusion and $scoreFusion Unbounded Memory Allocation During Error Suggestion Generatio
CVE-2026-13065 6.5 MEDIUM MongoDB $linearFill Window Function Improper Input Validation Leading to Process Terminati
CVE-2026-13055 6.5 MEDIUM Server crash via aggregation pipeline expression with compound wildcard index specificatio
CVE-2026-13069 6.5 MEDIUM Queryable Encryption FLE2 Find Payload Missing Input Validation Leading to Resource Exhaus
CVE-2026-9737 6.5 MEDIUM Find command with $meta sort can lead to crash
CVE-2026-13064 6.5 MEDIUM MongoDB $jsonSchema Query Operator Excessive CPU Consumption Leading to Denial of Service
CVE-2026-13076 6.5 MEDIUM Aggregation Framework Memory Exhaustion Leading to Process Termination
CVE-2026-13071 6.5 MEDIUM Server-Side JavaScript Aggregation Expression Memory Safety Issue Leading to Process Termi
CVE-2026-13067 6.3 MEDIUM tlsCATrusts Role Restriction Not Enforced via PROXY Protocol v2 on Unix Domain Socket
CVE-2026-13057 5.3 MEDIUM Authorization Bypass via Client-Supplied $search.mergingPipeline Leaks Unauthorized Collec
CVE-2026-13070 5.3 MEDIUM Improper Validation of OCSP Response During Outbound TLS Handshake Leading to Process Term

Showing top 20 of 26 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: MongoDB Server
Same vendor: MongoDB
Same weakness: CWE-125

V. Comments for CVE-2026-13077

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