CVE-2026-57228 Suricata smtp/mime: heap out-of-bounds read quoted-printable decoder
Crafted SMTP traffic can cause a heap out-of-bounds read and crash Suricata when MIME decoding is enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-57228?
CVE-2026-57228 is a high-severity memory corruption vulnerability in Oisf Suricata, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-125
Which versions are affected by CVE-2026-57228?
It affects 1 product.
Products include Oisf Suricata.
How do I fix CVE-2026-57228?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-57228 being exploited?
There is no known exploitation of CVE-2026-57228 in the wild and no public exploit code.
Other vulnerabilities in Oisf Suricata
Sources
Also known as DEBIAN-CVE-2026-57228, GHSA-qxm4-q7vx-7xj4, UBUNTU-CVE-2026-57228.