CVE-2022-28366: Antisamy Project Antisamy

High severity, CVSS 7.5. EPSS: 2.1% chance of exploitation in the next 30 days.

Certain Neko-related HTML parsers allow a denial of service via crafted Processing Instruction (PI) input that causes excessive heap memory consumption. In particular, this issue exists in HtmlUnit-Neko through 2.26, and is fixed in 2.27. This issue also exists in CyberNeko HTML through 1.9.22 (also affecting OWASP AntiSamy before 1.6.6), but 1.9.22 is the last version of CyberNeko HTML. NOTE: this may be related to CVE-2022-24839.

Affected products

• Antisamy Project Antisamy: before 1.6.6 (fixed in 1.6.6)
• Cyberneko Html Project Cyberneko Html: up to and including 1.9.22
• Htmlunit Htmlunit: before 2.27 (fixed in 2.27)

Published 2022-04-21. Last modified 2026-06-17.