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


- **Severity:** High 8.2 (`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`)
- **Exploited in the wild:** Not known
- **Fix available:** Yes
- **Published:** 14 Oct 2026
- **Updated:** 16 Oct 2026
- **Also known as:** AZL-108204, DEBIAN-CVE-2026-94200, EEF-CVE-2026-94200, GHSA-m5mh-q53w-67jq, UBUNTU-CVE-2026-94200

## What is CVE-2026-94200?

CVE-2026-94200 is a high-severity vulnerability in Erlang OTP, published on 14 Oct 2026. 

### Official 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.

Weakness: CWE-1288 (Improper Validation of Consistency within Input)

## Which versions are affected by CVE-2026-94200?


## How do I fix CVE-2026-94200?

Upgrade to a fixed version.

## Is CVE-2026-94200 being exploited?

There is no known exploitation of CVE-2026-94200 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-94200 and fix it if it is affected.

What it is: CVE-2026-94200 is a high-severity vulnerability in Erlang OTP, published on 14 Oct 2026. 
Exploitation: There is no known exploitation of CVE-2026-94200 in the wild and no public exploit code.

Affected product: Erlang OTP. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-94200/ (Markdown: https://insights.sbomify.com/CVE-2026-94200/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-94200
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-94200
- OSV: https://osv.dev/vulnerability/CVE-2026-94200

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-94200/
Summaries are generated and may contain mistakes; the official description above is the record.