What’s Vulnerable › Vulnerabilities

CVE-2026-57228: Suricata smtp/mime: heap out-of-bounds read quoted-printable decoder

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-09-18 · updated 2026-09-29
• Weakness: CWE-125

Description

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

How to fix

Upgrade to a fixed version: OISF suricata 7.0.17. Check the vendor advisory for mitigations.

References

• https://github.com/OISF/suricata/commit/19880f9d5bbe2b8f8e8867a577848dce2b532c86
• https://github.com/OISF/suricata/releases/tag/suricata-7.0.17
• https://github.com/OISF/suricata/security/advisories/GHSA-qxm4-q7vx-7xj4
• https://redmine.openinfosecfoundation.org/issues/8608

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