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CVE-2026-40518— ByteDance DeerFlow Path Traversal and Arbitrary File Write via Bootstrap Mode

Quick assessment

Affected
bytedance deer-flow
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.

DeerFlow是Bytedance开源的一个开源智能体编排框架，用于协调子代理与技能执行。 DeerFlow存在安全漏洞，该漏洞源于引导模式自定义代理创建中代理名称验证被绕过，可能导致路径遍历和任意文件写入。

CVSS 7.1 · High EPSS 0.55% · P45

Affected Version Matrix 1

VendorProduct Version RangeStatus
bytedance deer-flow < 2176b2bbfccfce25ceee08318813f96d843a13fd affected
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I. Basic Information for CVE-2026-40518

Vulnerability Information
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Vulnerability Title
ByteDance DeerFlow Path Traversal and Arbitrary File Write via Bootstrap Mode
Source: CVE Program / CVE List V5
Vulnerability Description
ByteDance DeerFlow before commit 2176b2b contains a path traversal and arbitrary file write vulnerability in bootstrap-mode custom-agent creation where the agent name validation is bypassed. Attackers can supply traversal-style values or absolute paths as the agent name to influence directory creation and write files outside the intended custom-agent directory, potentially achieving arbitrary file write on the system subject to filesystem permissions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/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
Vulnerability Title
DeerFlow 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
DeerFlow是Bytedance开源的一个开源智能体编排框架，用于协调子代理与技能执行。 DeerFlow存在安全漏洞，该漏洞源于引导模式自定义代理创建中代理名称验证被绕过，可能导致路径遍历和任意文件写入。
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
bytedance deer-flow 0 ~ 2176b2bbfccfce25ceee08318813f96d843a13fd -

II. Public POCs for CVE-2026-40518

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III. Intelligence Information for CVE-2026-40518

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Patches & Fixes for CVE-2026-40518 (2)

Vendor Advisories for CVE-2026-40518 (1)

IV. Related Vulnerabilities

Same vendor: bytedance
Same weakness: CWE-22

V. Comments for CVE-2026-40518

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