Bug 2537860 (CVE-2026-57228)

Summary: CVE-2026-57228 suricata: Suricata: Denial of Service via heap out-of-bounds read in SMTP MIME decoder
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Suricata. A heap out-of-bounds read vulnerability exists in the SMTP MIME quoted-printable decoder. A remote attacker can send specially crafted SMTP traffic, causing a quoted-printable escape sequence to be split across traffic chunks. This can lead to a one-byte read past a heap buffer, resulting in a denial of service by crashing the Suricata engine.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2539185, 2539187    
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Description OSIDB Bzimport 2026-09-22 15:48:40 UTC 
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.