Bug 2540160 (CVE-2026-73064)

Summary: CVE-2026-73064 mbedtls: Mbed TLS: TLS stream integrity compromise via entropy source failure
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: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Mbed TLS. An attacker who can cause an entropy source to fail can remove or inject bytes into the start of the Transport Layer Security (TLS) stream. This vulnerability specifically affects TLS 1.3 servers, potentially compromising the integrity of communication.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2540653    
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Description OSIDB Bzimport 2026-09-24 15:11:35 UTC
In Mbed TLS 3.2.0 though 3.6.6 and 4.0.0 through 4.1.0, an attacker who can cause an entropy source to fail can remove or inject bytes into the start of the TLS stream. This only affects TLS 1.3 servers.