5.3
Medium
CVE-2026-42505 Handshakes which used Encrypted Client Hello could be de-anonymized by a passive network observer due to a disclosure of…
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| crypto/tls 1.27 | earliest → < 1.27.0-rc.2 | 1.27.0-rc.2 |
| crypto/tls 1.26 | 1.26.0-0 → < 1.26.5 | 1.26.5 |
| crypto/tls 1.25 | earliest → < 1.25.12 | 1.25.12 |
Other CVEs of crypto/tls
The 13 CVEs of crypto/tls →
CVE-2026-97031
Multiple ECH outer extension references are not permitted under RFC 9849; previously, a client could send a well-crafted…
7.5
High
CVE-2026-56862
Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has…
7.5
High
CVE-2026-32283
If one side of the TLS connection sends multiple key update messages post-handshake in a single record, the connection…
7.5
High
CVE-2025-68121
During session resumption in crypto/tls, if the underlying Config has its ClientCAs or RootCAs fields mutated between…
9.1
Critical