CVE Catalog

CVE-2026-42505

MediumCVSS 5.3
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.38%

32th percentile - higher than 32% of all known CVEs

Summary

The vulnerability allows de-anonymization of TLS handshakes using Encrypted Client Hello (ECH). A passive network observer can read pre-shared key (PSK) identities in the unencrypted part of the client hello.

Risk Assessment

The organization risks user privacy loss, as an attacker can identify specific sessions or clients even with ECH enabled.

Recommendation

Update TLS/SSL libraries to a version that fixes PSK handling in the context of ECH, and verify server configurations for PSK identity leakage.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS