Critical severity · published Sep 18, 2026
CVE-2026-57228
Suricata smtp/mime: heap out-of-bounds read quoted-printable decoder
9.1
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 36% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SU
suricata · OISF
>= 7.0.13, < 7.0.17 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-57228
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-57228
Patch
https://github.com/OISF/suricata/commit/19880f9d5bbe2b8f8e8867a577848dce2b532c86
Release Notes
https://github.com/OISF/suricata/releases/tag/suricata-7.0.17
Mitigation
https://github.com/OISF/suricata/security/advisories/GHSA-qxm4-q7vx-7xj4
Exploit
https://redmine.openinfosecfoundation.org/issues/8608
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