Bug 2537916 (CVE-2026-94057)

Summary: CVE-2026-94057 exim: Exim: SMTP smuggling via crafted data during DATA processing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Exim. A remote attacker could exploit a vulnerability known as SMTP smuggling by sending crafted data after a rejection during the DATA processing phase. This manipulation could lead to a mismatch between the intended sent message and the actual received message, potentially allowing for message spoofing or alteration.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2539253, 2539254    
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Description OSIDB Bzimport 2026-09-22 16:04:09 UTC
Exim before 4.100.1 allows SMTP smuggling in which the received message does not match any sent message, and instead depends on crafted data sent after a rejection during DATA processing.