CVE-2026-55952
Fixed in a distro release EPSS <1%CVSS 8.2
The Erlang/OTP ssl application does not validate that the PSK identity list and binder list carried in a TLS 1.3 ClientHello pre-shared key extension have equal length before passing them to the session ticket handler. In tls_handshake_1_3:handle_pre_shared_key/3, an OfferedPreSharedKeys record with a mismatched number of identities and binders is forwarded directly to tls_server_session_ticket:use/4, which crashes the session ticket handler process. An unauthenticated remote attacker can send a single crafted ClientHello to a TLS 1.3 server with session tickets enabled (stateful or stateless mode) and permanently disrupt session ticket handling on that listener. New TLS 1.3 handshakes complete but subsequently crash when the server attempts to issue a session ticket, effectively making TLS 1.3 unusable on the affected listener until the ssl application is restarted. TLS 1.2 connections are not affected. This issue affects OTP from OTP 22.2 before OTP 29.0.3, OTP 28.5.0.3 and OTP 27.3.4.14, corresponding to ssl from 9.5 before 11.7.3, 11.6.0.3 and 11.2.12.10.
Products: erlang otp
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 12 | erlang | no fix |
| Debian 13 | erlang | 1:27.3.4.1+dfsg-1+deb13u3 |
| Debian 14 | erlang | 1:29.0.3+dfsg-1 |
| Red Hat hummingbird 1 | erlang27 | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-asn1 | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-common_test | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-compiler | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-crypto | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-debugger | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-dialyzer | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-diameter | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-edoc | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-eldap | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-erl_interface | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-erts | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-et | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-eunit | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-examples | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-ftp | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-gdb-tools | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-inets | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-jinterface | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-kernel | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-megaco | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-mnesia | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-observer | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-odbc | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-os_mon | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-parsetools | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-public_key | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-reltool | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-runtime_tools | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-sasl | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-snmp | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-ssh | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-ssl | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-stdlib | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-syntax_tools | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-tftp | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-tools | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-wx | 0:27.3.4.17-1.hum1 |
| Red Hat hummingbird 1 | erlang27-xmerl | 0:27.3.4.17-1.hum1 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | erlang | 23.3.4.19-150300.3.39.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | erlang | 23.3.4.19-150300.3.39.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | erlang | 23.3.4.19-150300.3.39.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | erlang | 23.3.4.19-150300.3.39.1 |
| SUSE Linux Enterprise Module for Server Applications 15 SP7 | erlang | 23.3.4.19-150300.3.39.1 |
| SUSE Linux Enterprise Module for Server Applications 15 SP7 | erlang26 | 26.2.1-150300.7.28.1 |
| SUSE Linux Enterprise Server 15 SP4-LTSS | erlang | 23.3.4.19-150300.3.39.1 |
| SUSE Linux Enterprise Server 15 SP5-LTSS | erlang | 23.3.4.19-150300.3.39.1 |
| SUSE Linux Enterprise Server 15 SP6-LTSS | erlang | 23.3.4.19-150300.3.39.1 |
| SUSE Linux Enterprise Server 15 SP6-LTSS | erlang26 | 26.2.1-150300.7.28.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | erlang | 23.3.4.19-150300.3.39.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | erlang | 23.3.4.19-150300.3.39.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | erlang | 23.3.4.19-150300.3.39.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | erlang26 | 26.2.1-150300.7.28.1 |
| Ubuntu 22.04 LTS | erlang | 1:24.2.1+dfsg-1ubuntu0.8 |
| Ubuntu 24.04 LTS | erlang | 1:25.3.2.8+dfsg-1ubuntu4.8 |
| Ubuntu 25.10 | erlang | no fix |
| Ubuntu 26.04 LTS | erlang | 1:27.3.4.6+dfsg-1ubuntu0.2 |
| Ubuntu Pro 14.04 LTS | erlang | 1:16.b.3-dfsg-1ubuntu2.2+esm3 |
| Ubuntu Pro 16.04 LTS | erlang | 1:18.3-dfsg-1ubuntu3.1+esm4 |
| Ubuntu Pro 18.04 LTS | erlang | 1:20.2.2+dfsg-1ubuntu2+esm4 |
| Ubuntu Pro 20.04 LTS | erlang | 1:22.2.7+dfsg-1ubuntu0.5+esm3 |
| openSUSE Tumbleweed | erlang | 28.5.0.4-1.1 |
| openSUSE Tumbleweed | erlang27 | 27.1.3-3.1 |