How broadly exploitable is this vulnerability?

It is remotely exploitable by any attacker who can reach the affected file upload endpoint. No prior authentication may be required if the upload route is public, making it suitable for opportunistic and automated attacks.

What level of access does an attacker need to exploit it?

The attacker only needs network access to the vulnerable Flask endpoint that accepts uploads and trusts user-controlled filename or `name` parameters. They do not need shell access or local filesystem access.

What is the safest general fix pattern for affected applications?

The safest pattern is to eliminate user control over storage paths by using auto-generated filenames within a fixed upload directory, enforce strict allowlists for extensions, and ensure uploaded files are never interpreted as templates or code. Refactoring the upload logic to centralize these constraints is usually more robust than patching individual call sites.

Severity:

CRITICAL RISK

(9.8)

Path Traversal & SSTI-Based RCE (CWE-22, CWE-1336) in Flask-Reuploaded File Upload Handling

CVE-2026-27641

Published:

Feb 24, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-78

CRITICAL RISK

CRITICAL

(9.9)

Command Injection in MCP Stdio Configuration Validation (CWE-78) in WeKnora

Remote Code Execution

March 7, 2026

CWE-89

CRITICAL RISK

CRITICAL

(9.9)

SQL Injection via PostgreSQL Array/Row Expressions (CWE-89) in WeKnora Query Engine

Remote Code Execution via SQL Injection on the Database Server

March 7, 2026

Vulnerability Type

Category:

Path Traversal and Server-Side Template Injection

CWE:

CWE-1336;CWE-22

Impact:

Remote Code Execution via Arbitrary File Write

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

Vulnerability Type

Category:

Path Traversal and Server-Side Template Injection

CWE:

CWE-1336;CWE-22

Impact:

Remote Code Execution via Arbitrary File Write

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

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355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Path Traversal & SSTI-Based RCE (CWE-22, CWE-1336) in Flask-Reuploaded File Upload Handling

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.9)

Command Injection in MCP Stdio Configuration Validation (CWE-78) in WeKnora

CRITICAL RISK

CRITICAL

(9.9)

SQL Injection via PostgreSQL Array/Row Expressions (CWE-89) in WeKnora Query Engine

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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