CVE-2026-42505
5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Go standard library | crypto/tls | 0 < 1.25.12 | affected |
| Go standard library | crypto/tls | 1.26.0-0 < 1.26.5 | affected |
| Go standard library | crypto/tls | 1.27.0-0 < 1.27.0-rc.2 | affected |
Weaknesses
- CWE-201: Insertion of Sensitive Information Into Sent Data
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: yes
- Technical Impact: partial
References
- https://go.dev/cl/775960
- https://go.dev/issue/79282
- https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc
- https://pkg.go.dev/vuln/GO-2026-5856
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