CVE-2021-32723: Oracle Application Express

Medium severity, CVSS 6.5. EPSS: 1.4% chance of exploitation in the next 30 days.

Prism is a syntax highlighting library. Some languages before 1.24.0 are vulnerable to Regular Expression Denial of Service (ReDoS). When Prism is used to highlight untrusted (user-given) text, an attacker can craft a string that will take a very very long time to highlight. This problem has been fixed in Prism v1.24. As a workaround, do not use ASCIIDoc or ERB to highlight untrusted text. Other languages are not affected and can be used to highlight untrusted text.

Affected products

• Oracle Application Express: before 21.1.4 (fixed in 21.1.4)
• Prismjs Prism: before 1.24.0 (fixed in 1.24.0)

Published 2021-06-28. Last modified 2026-06-17.