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.
Published: 2026-04-17
Score: 7.1 High
EPSS: < 1% Very Low
KEV: No
Impact: Arbitrary File Write
Action: Apply Patch
AI Analysis

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Remediation

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Tracking

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History

Fri, 17 Apr 2026 21:00:00 +0000

Type Values Removed Values Added
First Time appeared Bytedance
Bytedance deer-flow
Vendors & Products Bytedance
Bytedance deer-flow

Fri, 17 Apr 2026 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 17 Apr 2026 17:15:00 +0000

Type Values Removed Values Added
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.
Title ByteDance DeerFlow Path Traversal and Arbitrary File Write via Bootstrap Mode
Weaknesses CWE-22
References
Metrics cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H'}

cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N'}


Subscriptions

Bytedance Deer-flow
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-04-17T18:35:51.128Z

Reserved: 2026-04-13T20:29:02.809Z

Link: CVE-2026-40518

cve-icon Vulnrichment

Updated: 2026-04-17T18:35:46.688Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-04-17T17:17:09.543

Modified: 2026-04-17T19:01:56.030

Link: CVE-2026-40518

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-18T17:15:05Z

Weaknesses