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erlang

A vulnerability in Erlang/OTP ssl allows a peer responding to a TLS 1.3 client connection to impersonate the intended server by bypassing certificate validation. This occurs due to improper handling of a pre_shared_key extension in the ServerHello message, which the client never offered, causing the client to skip certificate verification steps. The issue affects default client configurations using TLS 1.3 and impacts OTP versions from 22.2 up to but not including 27.3.4.18, 28.5.0.7, and 29.1.1.

The vulnerability in Erlang/OTP ssl arises from a key exchange without entity authentication during TLS 1.3 handshakes. Specifically, if a server sends a pre_shared_key extension in the ServerHello message that the client did not offer, the client incorrectly sets a resumption flag and skips certificate validation steps such as certificate path validation, hostname verification, and OCSP stapling. This allows an attacker to complete the handshake and impersonate the server without possessing a certificate or private key. The flaw affects OTP versions from 22.2 before 27.3.4.18, 28.5.0.7, and 29.1.1, corresponding to ssl versions from 9.5 before 11.2.12.13, 11.6.0.6, and 11.7.7. Clients restricted to TLS 1.2 are not affected.

Detailed information about Key Exchange without Entity Authentication vulnerability in Erlang/OTP ssl allows a peer that answers a TLS 1.3 client connection to 

Key Exchange without Entity Authentication vulnerability in Erlang/OTP ssl allows a peer that answers a TLS 1.3 client connection to impersonate the… (CVE-2026-89422) - Live Threat Intelligence - Threat Radar | OffSeq.com

Key Exchange without Entity Authentication vulnerability in Erlang/OTP ssl allows a peer that answers a TLS 1.3 client connection to impersonate the… (CVE-2026-89422)

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