Erlang OTP prior 27.3.4.19/28.5.0.8/29.1.2 TLS 1.3 Handshake tls_handshake_1_3.erl tls_handshake_1_3:get_max_early_data input validation

Summaryinfo

A vulnerability was found in Erlang OTP. It has been classified as problematic. This affects the function tls_handshake_1_3:get_max_early_data of the file tls_handshake_1_3.erl of the component TLS 1.3 Handshake. The manipulation leads to input validation. This vulnerability is uniquely identified as CVE-2026-94200. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Erlang OTP. This issue affects the function tls_handshake_1_3:get_max_early_data of the file tls_handshake_1_3.erl of the component TLS 1.3 Handshake. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is availability. The summary by CVE is:

Improper Validation of Consistency within Input vulnerability in Erlang OTP ssl (tls_handshake_1_3, ssl_handshake and tls_client_ticket_store modules) allows a malicious TLS 1.3 server to cause a denial of service of the ssl application on the client node. The TLS 1.3 client decodes the extensions of a NewSessionTicket message as if they came from EncryptedExtensions. It therefore accepts a 0-length early_data extension, a form that is only valid in ClientHello and EncryptedExtensions. With {session_tickets, auto}, the client stores the ticket in the node-global tls_client_ticket_store. On the next automatic resumption, tls_handshake_1_3:get_max_early_data/1 crashes the store with a case_clause. Repeated crashes can exceed the restart intensity of the ssl supervisors, which use the rest_for_one strategy, and take down ssl for all connections on the node. This issue affects OTP from OTP 23.3 before OTP 27.3.4.19, OTP 28.5.0.8, and OTP 29.1.2, corresponding to ssl from 10.3 before 11.2.12.14, 11.6.0.7, and 11.7.8.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-94200 since 09/21/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

Upgrading to version 27.3.4.19, 28.5.0.8 or 29.1.2 eliminates this vulnerability.

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Productinfo

Vendor

• Erlang

Name

• OTP

Website

• Product: https://github.com/erlang/otp/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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