CVE-2026-40518

HIGH SEVERITY

CVSS Score & Metrics

Base Score

7.1 / 10

Vector String

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

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.

Vulnerability Details

Published Date

April 17, 2026

Last Modified

April 17, 2026

CWE ID

CWE-22

Source

NVD

Vendor

bytedance

Product

deer-flow

External References

https://github.com/bytedance/deer-flow/commit/2176b2bbfccfce25ceee08318813f96d843a13fd
https://github.com/bytedance/deer-flow/pull/2274
https://www.vulncheck.com/advisories/bytedance-deerflow-path-traversal-and-arbitrary-file-write-via-bootstrap-mode

CVE-2026-40518

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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