What is the CVSS score of CVE-2025-55526?

CVE-2025-55526 has a CVSS 3.1 base score of 9.1 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N. EPSS exploitation probability: 0.6%.

Which versions of Fastapi are affected by CVE-2025-55526?

Organizations using n8n-workflows Main Commit ee25413 face critical risk from CVE-2025-55526, a path traversal vulnerability rated CVSS 9.1.

Is there a public PoC exploit available for CVE-2025-55526?

Yes, a public proof-of-concept exploit is available for CVE-2025-55526. Prioritise patching immediately. EPSS: 0.6%.

How to fix or mitigate CVE-2025-55526?

Within 24 hours: Identify all affected systems and apply vendor patches immediately. Review file handling controls and restrict upload directories.

Fastapi CVE-2025-55526

CRITICAL

Path Traversal (CWE-22)

2025-08-26 cve@mitre.org

Path Traversal Fastapi Pydantic Uvicorn

9.1

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.1 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:08 vuln.today

PoC Detected

Sep 15, 2025 - 19:38 vuln.today

Public exploit code

CVE Published

Aug 26, 2025 - 14:15 nvd

CRITICAL 9.1

DescriptionCVE.org

n8n-workflows Main Commit ee25413 allows attackers to execute a directory traversal via the download_workflow function within api_server.py

AnalysisAI

n8n-workflows Main Commit ee25413 allows attackers to execute a directory traversal via the download_workflow function within api_server.py. Rated critical severity (CVSS 9.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Path Traversal (CWE-22), which allows attackers to access files and directories outside the intended path. n8n-workflows Main Commit ee25413 allows attackers to execute a directory traversal via the download_workflow function within api_server.py Affected products include: N8N Fastapi, N8N Pydantic, N8N Uvicorn.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Validate and canonicalize file paths. Use chroot or sandboxing. Reject input containing path separators or '../' sequences.

CVE-2025-55526 vulnerability details – vuln.today

Back

Fastapi CVE-2025-55526

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

Share

External POC / Exploit Code