VulnerabilityAnalyzed
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.
MEDIUM 5.3EPSS 0.38%
Does this matter?
Lower severity and a low EPSS score (0.38%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- EPSS
- 0.38% probability · 32th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-201
- Affected
- golang/go
- Source
- security@golang.org
References
- https://go.dev/cl/775960Patch
- https://go.dev/issue/79282Issue Tracking, Patch
- https://groups.google.com/g/golang-announce/c/OrmQE_Yp5ScMailing List, Release Notes, Vendor Advisory
- https://pkg.go.dev/vuln/GO-2026-5856Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.