Erlang/OTP is a core runtime for many backend services; a TLS 1.3-triggered node-wide ssl crash can cause widespread outages across services using OTP.
CVE-2026-94200
TLS 1.3 server can crash Erlang/OTP ssl client, causing node-wide DoS.
Is CVE-2026-94200 being exploited?
Not confirmed. CVE-2026-94200 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.47% probability of exploitation in the next 30 days.
How severe is CVE-2026-94200?
CVE-2026-94200 is rated High with a CVSS score of 8.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-94200?
Yes. A fix has been recorded for CVE-2026-94200. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-94200 affect?
CVE-2026-94200 affects Erlang/OTP ssl (vulnerable OTP from 23.3 up to fixes before 27.3.4.19, 28.5.0.8, 29.1.2), Applications using Erlang-based servers (e.g., RabbitMQ, CouchDB, custom OTP services). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-94200?
Apply OTP security updates to the fixed versions and restart affected nodes.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
A malicious TLS 1.3 server can crash the client's ssl application via a malformed NewSessionTicket, causing node-wide denial of service/outage.
Immediate action required
- affected>= 23.3 and < *
- affected>= 10.3 and < *
- affected>= 0abe6f66db0d295cd06b0efab3bdb3caa2803930 and < *
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.