CVE-2026-30830: Kepano Defuddle

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

Defuddle cleans up HTML pages. Prior to version 0.9.0, the _findContentBySchemaText method in src/defuddle.ts interpolates image src and alt attributes directly into an HTML string without escaping. An attacker can use a " in the alt attribute to break out of the attribute context and inject event handler. This issue has been patched in version 0.9.0.

Affected products

• Kepano Defuddle: before 0.9.0 (fixed in 0.9.0)

Published 2026-03-07. Last modified 2026-06-17.