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CVE-2026-55952 is a high-severity denial-of-service vulnerability in the Erlang/OTP ssl application affecting TLS 1.3 server processing of the ClientHello pre-shared key extension. In tls_handshake_1_3:handle_pre_shared_key/3, the implementation does not validate that the PSK identity list and binder list in the OfferedPreSharedKeys structure have equal length before forwarding the data to tls_server_session_ticket:use/4. A malformed ClientHello containing mismatched identity and binder counts can therefore reach the session ticket handling logic and crash the session ticket handler process. The issue affects OTP from 22.2 before 29.0.3, 28.5.0.3, and 27.3.4.14, corresponding to ssl from 9.5 before 11.7.3, 11.6.0.3, and 11.2.12.10. TLS 1.2 is not affected.
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A high-severity improper input validation vulnerability in the Erlang/OTP SSL application, specifically in tls_handshake_1_3:handle_pre_shared_key/3, where mismatched pre-shared key identity and binder list lengths in a TLS 1.3 ClientHello can be used by an unauthenticated remote attacker to affect service availability.
A high-severity denial-of-service vulnerability in the Erlang/OTP ssl application where a malformed TLS 1.3 ClientHello pre-shared key extension can crash session ticket handling, disrupting TLS 1.3 on the affected listener until restart.
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Cross-references every affected SKU, including bundled OEM variants.
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