CVE-2021-27671: Comrak Project Comrak

Medium severity, CVSS 6.1. EPSS: 0.7% chance of exploitation in the next 30 days.

An issue was discovered in the comrak crate before 0.9.1 for Rust. XSS can occur because the protection mechanism for data: and javascript: URIs is case-sensitive, allowing (for example) Data: to be used in an attack.

Affected products

• Comrak Project Comrak: before 0.9.1 (fixed in 0.9.1)

Published 2021-02-25. Last modified 2026-06-17.