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CVE-2026-84967— Arbitrary command execution via shell-expanded connection string in Launch MongoDB Shell terminal

Quick assessment

Affected
MongoDB MongoDB for VS Code
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.

Visual Studio Code 的 MongoDB 扩展的一个组件在将连接字符串放入扩展为集成终端构建的命令行时，未对特殊字符进行过滤（中性化处理）。一个未经认证的远程未授权用户若能诱使开发者接受一个由该用户提供的连接目标，并随后打开扩展的 Shell 功能，则可以将该用户自选的字符插入到该命令行中。此漏洞在开发者机器上无需任何特权，但需要开发者执行若干操作。开发者所看到的确认提示框不会显示所供应的文本内容。

CVSS 4.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
MongoDB MongoDB for VS Code 1.13.0< 1.17.1 affected
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I. Basic Information for CVE-2026-84967

Vulnerability Information
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Vulnerability Title
Arbitrary command execution via shell-expanded connection string in Launch MongoDB Shell terminal
Source: CVE Program / CVE List V5
Vulnerability Description
A component of the MongoDB extension for Visual Studio Code does not neutralize special characters in a connection string before that value is placed into a command line the extension composes for an integrated terminal. An unauthenticated remote unauthorized-user who persuades a developer to accept a user-supplied connection target, and then to open the extension's shell feature, can place characters of the unauthorized-user’s choosing into that command line. No privileges on the developer's machine are required, but several user actions are. The confirmation the developer sees does not display the supplied text.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MongoDB MongoDB for VS Code 1.13.0 ~ 1.17.1 -

II. Public POCs for CVE-2026-84967

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III. Intelligence Information for CVE-2026-84967

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Vendor Pages for CVE-2026-84967 (1)

Same Patch Batch · MongoDB · 2026-09-03 · 10 CVEs total

CVE-2026-84971 6.5 MEDIUM Persistent client crash loop via undersized FLE2 insert-update ciphertext in decryption pa
CVE-2026-84970 6.2 MEDIUM Heap over-read or silent misparse via 32-bit truncation of JSON length in BSON JSON parser
CVE-2026-84964 5.9 MEDIUM Heap corruption via OCSP request double free from crafted multi-URL certificate in TLS cli
CVE-2026-84963 5.3 MEDIUM Silent field truncation via unchecked int cast of huge JSON string values in JSON-to-BSON
CVE-2026-84968 5.3 MEDIUM Heap out-of-bounds read via corrupt nested BSON in field path error message
CVE-2026-84965 5.1 MEDIUM Heap write primitive via size round-up wrap during JSON parsing on 32-bit builds
CVE-2026-84966 5.1 MEDIUM BSON element injection via NUL-embedded document keys in builder append
CVE-2026-84962 4.2 MEDIUM Authenticated KMS request forgery via CRLF injection in GCP key identifier strings
CVE-2026-84969 3.7 LOW Heap overflow via truncated base64 encoding of binary fields in length-limited JSON output

IV. Related Vulnerabilities

Same product: MongoDB for VS Code
Same vendor: MongoDB
Same weakness: CWE-78

V. Comments for CVE-2026-84967

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