CVE intelligence

CVE-2026-73064

Vulnerability intelligence

Published Sep 24, 2026Sources checked Oct 4, 2026

2.9LOWCVSS out of 10

What this means

Review the available evidence

CVE-2026-73064 and is rated Low severity with a CVSS score of 2.9. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Release Notes

CISA KEVNot listedBased on the latest collected catalog

EPSS0.1%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-73064?

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.