Answer in brief
CVE-2026-40518 records a Unknown severity 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.
A CVSS score is not reported in the current record. 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.
| 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
Aug 14, 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.
Answer in brief
CVE-2026-40518 records a Unknown severity 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.
A CVSS score is not reported in the current record. 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.
| 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
Aug 14, 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.