CVE-2026-57228: Oisf Suricata

Critical severity, CVSS 9.1. EPSS: 0.4% chance of exploitation in the next 30 days.

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 7.0.13 until 7.0.17, the SMTP MIME quoted-printable decoder in src/util-decode-mime.c can read one byte past a heap buffer when a quoted-printable escape sequence is split across traffic chunks and the following chunk contains exactly one byte. Crafted SMTP traffic can trigger the out-of-bounds read and crash Suricata when decode-quoted-printable MIME decoding is enabled. This issue is fixed in version 7.0.17.

Affected products

• Oisf Suricata: from 7.0.13, before 7.0.17 (fixed in 7.0.17)

Published 2026-09-18. Last modified 2026-09-29.