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High · 8.2 CVE-2026-94200 EUVD-2026-101384

TLS 1.3 client ticket store crashed by NewSessionTicket with empty early_data extension in ssl

Published Oct 14, 2026 · Updated Oct 16, 2026 · Assigned by EEF

Description

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.

Affected products

VendorProductAffectedFixed
Erlang OTP 23.3, 10.3 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 14 erlang 1:29.1.2+dfsg-1 —
Debian 13 erlang No fix yet —
Debian 12 erlang No fix yet —
ReleasePackageFixed inAdvisory
Ubuntu 26.10 erlang No fix yet —
Ubuntu 26.04 LTS erlang No fix yet —
Ubuntu 24.04 LTS erlang No fix yet —
Ubuntu 22.04 LTS erlang No fix yet —
Show 4 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu Pro 20.04 LTS erlang No fix yet —
Ubuntu Pro 18.04 LTS erlang No fix yet —
Ubuntu Pro 16.04 LTS erlang No fix yet —
Ubuntu Pro 14.04 LTS erlang No fix yet —
ReleasePackageFixed inAdvisory
Red Hat Hardened Images 1 erlang27 +38 27.3.4.19-0.1.hum1 RHSA-2026:83217

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 erlang 26.2.5.21-8 —

Advisories 2

References