PT-2026-33466 · Bytedance · Deer-Flow

Published 2026-04-17 · Updated 2026-04-19 · CVE-2026-40518

Positive Technologies (AI Summary)

CVSS v3.1

7.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions ByteDance DeerFlow versions prior to commit 2176b2b

Description An issue exists in bootstrap-mode custom-agent creation where the validation of the agent name is bypassed. This allows attackers to use absolute paths or traversal-style values as the agent name to influence directory creation and write files outside the intended custom-agent directory, which may lead to arbitrary file write on the system depending on filesystem permissions.

Recommendations Update to commit 2176b2b or a newer version.

Fix

Path traversal

Weakness Enumeration

CWE-22

Related Identifiers

CVE-2026-40518

Affected Products

Deer-Flow

References · 6

• https://github.com/bytedance/deer-flow/commit/2176b2bbfccfce25ceee08318813f96d843a13fd · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-40518 · Security Note
• https://github.com/bytedance/deer-flow/pull/2274 · Note
• https://vulncheck.com/advisories/bytedance-deerflow-path-traversal-and-arbitrary-file-write-via-bootstrap-mode · Note
• https://twitter.com/VulmonFeeds/status/2045237546515349869 · Twitter Post
• https://twitter.com/CVEnew/status/2045889726746407383 · Twitter Post