CVE-2026-42505

Invoking Encrypted Client Hello privacy leak in crypto/tls

Published Jul 8, 2026 CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Weaknesses CWE-201
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Go Standard Library
Go Standard Library crypto Tls
Vendors & Products Go Standard Library
Go Standard Library crypto Tls
Type Values Removed Values Added
Description 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.
Title Invoking Encrypted Client Hello privacy leak in crypto/tls
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
Go
Published
Updated
Jul 8, 2026, 7:38 PM
Reserved
Apr 28, 2026, 12:21 AM
Status
Analyzed
Published
Jul 8, 2026, 5:17 PM
Modified
Oct 25, 2026, 5:10 PM
Severity
Moderate
Public date
Jul 8, 2026, 3:46 PM