CVE-2026-57228

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.

• https://github.com/OISF/suricata/commit/19880f9d5bbe2b8f8e8867a577848dce2b532c86Patch
• https://github.com/OISF/suricata/releases/tag/suricata-7.0.17Release Notes
• https://github.com/OISF/suricata/security/advisories/GHSA-qxm4-q7vx-7xj4Mitigation
• https://redmine.openinfosecfoundation.org/issues/8608Exploit