Answer in brief
CVE-2026-40518 records a High severity (CVSS 7.1) vulnerability in ByteDance DeerFlow Path Traversal and Arbitrary File Write via Bootstrap Mode. The current sources do not mark it as known exploited. The current feed maps bytedance/deer-flow (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps bytedance/deer-flow (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:bytedance:deerflow:2.0-m0:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| bytedance/deer-flowgeneric | >=0 <2176b2bbfccfce25ceee08318813f96d843a13fd | 2176b2bbfccfce25ceee08318813f96d843a13fd |
Published upstream
Apr 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 14, 2026
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.
Quoted source text, attributed separately from HOL analysis.