CVE-2023-49991: Espeak-NG

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Espeak-ng 1.52-dev was discovered to contain a Stack Buffer Underflow via the function CountVowelPosition at synthdata.c.

Affected products

• Espeak-NG Espeak-NG: version 1.52 only

Published 2023-12-12. Last modified 2026-06-17.