CVE-2021-27671

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-02-25 · updated 2026-06-17
Weakness: CWE-79

Description

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

kivikakk comrak: before 0.9.1 — fixed in 0.9.1

How to fix

Upgrade to a fixed version: kivikakk comrak 0.9.1. Check the vendor advisory for mitigations.

References

https://rustsec.org/advisories/RUSTSEC-2021-0026.html
https://rustsec.org/advisories/RUSTSEC-2021-0026.html

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