Vulnerability DatabaseCVE-2026-42505
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CVE-2026-42505
Published:July 08, 2026
Updated:July 21, 2026
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.
Affected Packages
github.com/golang/go (GO):
Affected version(s) >=go1.26.0 <go1.26.5
Fix Suggestion:
Update to version go1.26.5
github.com/golang/go (GO):
Affected version(s) >=v0.0.0-20260210192755-d90b98e65320 <v0.0.0-20260221183820-6435bf46c17d
Fix Suggestion:
Update to version v0.0.0-20260221183820-6435bf46c17d
github.com/golang/go (GO):
Affected version(s) >=go1.25.0 <go1.25.12
Fix Suggestion:
Update to version go1.25.12
Related Resources (4)
https://pkg.go.dev/vuln/GO-2026-5856
https://go.dev/issue/79282
https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc
https://go.dev/cl/775960
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CVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Insertion of Sensitive Information Into Sent Data
CWE-201
EPSS
Base Score:
0.41