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CVE-2026-86540— knowns before 0.30.0 Arbitrary Code Execution via LSP Binary

Quick assessment

Affected
knowns-dev knowns
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.

Knowns.dev Knowns是Knowns.dev组织的一款知识管理应用。 Knowns.dev Knowns 0.30.0之前版本存在命令注入漏洞，该漏洞源于未能验证项目配置文件中的settings.lsp.languages二进制字段，可能导致攻击者通过构造恶意.knowns/config.json文件执行任意二进制。

CVSS 7.8 · High EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1204 · User Execution

Affected Version Matrix 2

VendorProduct Version RangeStatus
knowns-dev knowns < 0.30.0 affected
0.30.0 unaffected
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I. Basic Information for CVE-2026-86540

Vulnerability Information
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Vulnerability Title
knowns before 0.30.0 Arbitrary Code Execution via LSP Binary
Source: CVE Program / CVE List V5
Vulnerability Description
knowns versions before 0.30.0 fail to validate the settings.lsp.languages binary field in project configuration files, allowing attackers to execute arbitrary binaries by crafting a malicious .knowns/config.json file. When a repository with a crafted configuration is opened, the unvalidated binary path is executed twice under the user's account without any verification.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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
Vulnerability Title
Knowns.dev Knowns 命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Knowns.dev Knowns是Knowns.dev组织的一款知识管理应用。 Knowns.dev Knowns 0.30.0之前版本存在命令注入漏洞，该漏洞源于未能验证项目配置文件中的settings.lsp.languages二进制字段，可能导致攻击者通过构造恶意.knowns/config.json文件执行任意二进制。
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
knowns-dev knowns 0 ~ 0.30.0 -

II. Public POCs for CVE-2026-86540

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III. Intelligence Information for CVE-2026-86540

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Patches & Fixes for CVE-2026-86540 (1)

Vendor Advisories for CVE-2026-86540 (2)

Proof of Concept for CVE-2026-86540 (1)

Vendor Pages for CVE-2026-86540 (1)

Same Patch Batch · knowns-dev · 2026-09-07 · 8 CVEs total

CVE-2026-86543 9.8 CRITICAL knowns before 0.30.0 Unauthenticated Management API Exposure
CVE-2026-86542 9.1 CRITICAL knowns before 0.30.0 Path Traversal via Import Name
CVE-2026-86439 8.8 HIGH knowns before 0.30.0 Path Traversal via MCP doc and memory tools
CVE-2026-86541 8.3 HIGH knowns before 0.30.0 Path Traversal via code.replace MCP action
CVE-2026-86544 8.1 HIGH knowns before 0.30.0 Authorization Bypass via Misclassified Code Actions
CVE-2026-86538 7.5 HIGH knowns before 0.30.0 Path Traversal via templateFile parameter
CVE-2026-86539 7.2 HIGH knowns through 0.33.0 Server-Side Request Forgery via embedding-models endpoint

IV. Related Vulnerabilities

Same product: knowns
Same vendor: knowns-dev
Same weakness: CWE-78

V. Comments for CVE-2026-86540

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