Vulnerability 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 Score
5.3
MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Golang | Go | < 1.25.12 |
Related Weaknesses (CWE)
References
- https://go.dev/cl/775960Patch
- https://go.dev/issue/79282Issue TrackingPatch
- https://groups.google.com/g/golang-announce/c/OrmQE_Yp5ScMailing ListRelease NotesVendor Advisory
- https://pkg.go.dev/vuln/GO-2026-5856Vendor Advisory
FAQ
What is CVE-2026-42505?
CVE-2026-42505 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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.
How severe is CVE-2026-42505?
CVE-2026-42505 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-42505?
Check the references section above for vendor advisories and patch information. Affected products include: Golang Go.