CVE-2019-19204: Debian Linux

High severity, CVSS 7.5. EPSS: 6.9% chance of exploitation in the next 30 days.

An issue was discovered in Oniguruma 6.x before 6.9.4_rc2. In the function fetch_interval_quantifier (formerly known as fetch_range_quantifier) in regparse.c, PFETCH is called without checking PEND. This leads to a heap-based buffer over-read.

Affected products

• Debian Debian Linux: version 8.0 only
• Fedoraproject Fedora: version 30 only; version 31 only
• Oniguruma Project Oniguruma: from 6.0.0, before 6.9.4 (fixed in 6.9.4); version 6.9.4 only

Published 2019-11-21. Last modified 2026-06-17.