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CVE-2026-86541— knowns before 0.30.0 Path Traversal via code.replace MCP action

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.

在 0.30.0 之前已知的版本中，函数存在路径遍历漏洞，允许攻击者在项目根目录之外覆盖任意文件。攻击者可以通过提供绝对路径或包含目录遍历序列的相对路径，将恶意内容写入敏感文件，例如 Shell 启动脚本或 SSH 配置文件。

CVSS 8.3 · High Updated Sep 08, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

knowns before 0.30.0 Path Traversal via code.replace MCP action

Source: CVE Program / CVE List V5

Vulnerability Description

knowns versions before 0.30.0 contain a path traversal vulnerability in the handleCodeReplace() function that allows attackers to overwrite arbitrary files outside the project root. Attackers can supply absolute paths or relative paths containing directory traversal sequences to write malicious content to sensitive files like shell startup scripts or SSH configuration files.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

对路径名的限制不恰当(路径遍历)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
knowns-dev	knowns	0 ~ 0.30.0	-

II. Public POCs for CVE-2026-86541

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-86541

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Patches & Fixes for CVE-2026-86541 (1)

🔗 fix(security): guard code mutations · knowns-dev/knowns@a2c98fc · GitHub Read full article patch

Vendor Advisories for CVE-2026-86541 (2)

Vendor Pages for CVE-2026-86541 (1)

🔗 Release v0.30.0 · knowns-dev/knowns · GitHub release-notes

https://www.cve.org/CVERecord?id=CVE-2026-86541

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-2026-86544	8.1 HIGH	knowns before 0.30.0 Authorization Bypass via Misclassified Code Actions
CVE-2026-86540	7.8 HIGH	knowns before 0.30.0 Arbitrary Code Execution via LSP Binary
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-22

V. Comments for CVE-2026-86541

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Goal Reached Thanks to every supporter — we hit 100%!

CVE-2026-86541— knowns before 0.30.0 Path Traversal via code.replace MCP action

Quick assessment

Possible ATT&CK Techniques 1 AI

I. Basic Information for CVE-2026-86541

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-86541

III. Intelligence Information for CVE-2026-86541

Patches & Fixes for CVE-2026-86541 (1)

Vendor Advisories for CVE-2026-86541 (2)

Vendor Pages for CVE-2026-86541 (1)

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

IV. Related Vulnerabilities

V. Comments for CVE-2026-86541

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