CVE-2024-21524: Magiclen Stringbuilder

Critical severity, CVSS 9.1. EPSS: 0.8% chance of exploitation in the next 30 days.

All versions of the package node-stringbuilder are vulnerable to Out-of-bounds Read due to incorrect memory length calculation, by calling ToBuffer, ToString, or CharAt on a StringBuilder object with a non-empty string value input. It's possible to return previously allocated memory, for example, by providing negative indexes, leading to an Information Disclosure.

Affected products

• Magiclen Stringbuilder: up to and including 2.2.7

Published 2024-07-10. Last modified 2026-06-17.