CVE-2019-9710: Webargs Project Webargs

High severity, CVSS 8.1. EPSS: 1.1% chance of exploitation in the next 30 days.

An issue was discovered in webargs before 5.1.3, as used with marshmallow and other products. JSON parsing uses a short-lived cache to store the parsed JSON body. This cache is not thread-safe, meaning that incorrect JSON payloads could have been parsed for concurrent requests.

Affected products

• Webargs Project Webargs: before 5.1.3 (fixed in 5.1.3)

Published 2019-03-12. Last modified 2026-06-17.