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VULNERABILITIES

CVE-2026-42505 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: CISA-ADPCVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://go.dev/cl/775960 [email protected]Patch
https://go.dev/issue/79282 [email protected]Issue TrackingPatch
https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc [email protected]Mailing ListRelease NotesVendor Advisory
https://pkg.go.dev/vuln/GO-2026-5856 [email protected]Vendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-201Insertion of Sensitive Information Into Sent DataCISA-ADP

Affected Products

ProductVersions
golang go
>= 1.23.0, < 1.25.12
>= 1.26.0, < 1.26.5
1.27 rc1

CPE

  • cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*
  • cpe:2.3:a:golang:go:1.27:rc1:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-42505
NVD Published Date:
Jul 8, 2026
NVD Last Modified:
Sep 16, 2026
Source:
[email protected]
CVE-2026-42505 Details - Not Deferred