Bug 2538399 (CVE-2026-94055)

Summary: CVE-2026-94055 exim: Exim: Use-after-free vulnerability in GnuTLS TLS settings leading to denial of service
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, sghai, sidsharm, suppawar, vlaad
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Exim. When certain non-default TLS (Transport Layer Security) settings are used with GnuTLS, a use-after-free vulnerability exists. This flaw could allow a remote attacker to trigger a system crash, leading to a denial of service.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2539414, 2539415    
Bug Blocks:    

Description OSIDB Bzimport 2026-09-22 18:27:17 UTC
Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after-free.