CVE-2021-32816: Protonmail

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

ProtonMail Web Client is the official AngularJS web client for the ProtonMail secure email service. ProtonMail Web Client before version 3.16.60 has a regular expression denial-of-service vulnerability. This was fixed in commit 6687fb. There is a full report available in the referenced GHSL-2021-027.

Affected products

• Protonmail Protonmail: before 3.16.60 (fixed in 3.16.60)

Published 2021-05-14. Last modified 2026-06-17.