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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| 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.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | erlang | 1:29.1.2+dfsg-1 | — |
| Debian 13 | erlang | No fix yet | — |
| Debian 12 | erlang | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| 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)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| 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 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | erlang27 +38 | 27.3.4.19-0.1.hum1 | RHSA-2026:83217 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | erlang | 26.2.5.21-8 | — |
Advisories 2
- WID-SEC-2026-3964 Erlang/OTP: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 2, 2026
- RHSA-2026:83217 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
References
- GitHub Advisory related vendor-advisory
- EEF CNA record for CVE-2026-94200 related
- OSV record EEF-CVE-2026-94200 related
- Erlang/OTP version ordering
- Introducing commit 0abe6f6 in erlang/otp related
- Fix commit 66febc1 in erlang/otp patch
- Fix commit 00a333b in erlang/otp patch
- Fix commit cd03348 in erlang/otp patch