CVE-2019-9710 : What You Need to Know

Webargs prior to version 5.1.3, used with marshmallow and other products, has a vulnerability related to JSON parsing. The issue arises from the use of a non-thread-safe cache during JSON parsing, potentially leading to incorrect JSON payloads being processed concurrently.

Understanding CVE-2019-9710

This CVE entry highlights a vulnerability in the webargs library that affects its JSON parsing functionality.

What is CVE-2019-9710?

The vulnerability in CVE-2019-9710 stems from the lack of thread safety in the temporary cache used for storing parsed JSON bodies during the parsing process.

The Impact of CVE-2019-9710

The vulnerability could allow for incorrect JSON payloads to be parsed concurrently, potentially leading to data corruption or processing errors.

Technical Details of CVE-2019-9710

This section delves into the technical aspects of the CVE-2019-9710 vulnerability.

Vulnerability Description

The issue in webargs before version 5.1.3 involves the non-thread-safe cache used for storing parsed JSON bodies, which can result in incorrect JSON payloads being processed simultaneously.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions affected: Not applicable

Exploitation Mechanism

The vulnerability can be exploited by sending specially crafted JSON payloads to trigger concurrent parsing, potentially leading to data inconsistencies.

Mitigation and Prevention

To address CVE-2019-9710, follow these mitigation strategies:

Immediate Steps to Take

Upgrade to webargs version 5.1.3 or later to mitigate the vulnerability.
Avoid processing untrusted JSON payloads to reduce the risk of exploitation.

Long-Term Security Practices

Implement secure coding practices to ensure thread safety in data processing operations.
Regularly monitor and update dependencies to address known vulnerabilities.

Patching and Updates

Stay informed about security updates for webargs and related libraries to apply patches promptly.