CVE intelligence

CVE-2026-42505

Vulnerability intelligence

Published Jul 8, 2026Sources checked Sep 12, 2026

5.3MEDIUMCVSS out of 10

What this means

Review the available evidence

CVE-2026-42505 and is rated Medium severity with a CVSS score of 5.3. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

CISA KEVNot listedBased on the latest collected catalog

EPSS0.4%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-42505?

Handshakes which used Encrypted Client Hello could be de-anonymized by a passive network observer due to a disclosure of pre-shared key identities in the unencrypted client hello.