CVE-2026-94200
HighCVSS 8.2Summary
Erlang OTP ssl (tls_handshake_1_3, ssl_handshake and tls_client_ticket_store modules) has an improper validation of consistency within input. A malicious TLS 1.3 server can cause a denial of service of the ssl application on the client node by sending a NewSessionTicket message with invalid extensions.
Risk Assessment
A remote attacker could cause unavailability of ssl services on the client, potentially affecting all connections on the node and causing service disruptions.
Recommendation
Update Erlang OTP to version 27.3.4.19, 28.5.0.8, or 29.1.2 (or later) and review session_tickets configuration.
Other vulnerabilities in Erlang OTP
See all- CVE-2026-105236Medium
Improper certificate validation in the ssl application in Erlang/OTP allows a client holding a certificate trusted by one SNI virtual host to authenticate to a second SNI virtual host on the same listener by resuming its TLS 1.2 session there. A server serving multiple SNI names from one listen socket keeps one shared session cache and does not bind a cached session to the SNI name or client trust policy that established it. This affects OTP from 18.0 before 27.3.4.19, 28.5.0.8, and 29.1.2.
- CVE-2026-28808Critical
An incorrect authorization vulnerability in Erlang OTP (inets modules) allows unauthenticated access to CGI scripts protected by directory rules when served via script_alias. The path mismatch between access control evaluation and script execution allows bypassing protections.
- CVE-2026-23941Critical
In Erlang OTP (inets httpd module), an HTTP Request Smuggling vulnerability exists. The server does not reject or normalize duplicate Content-Length headers. The first value is used, while common proxies use the last, enabling front-end/back-end desynchronization and injection of attacker-controlled bytes as the start of the next request.
- CVE-2025-32433CriticalActively exploited
Erlang/OTP prior to versions OTP-27.3.3, OTP-26.2.5.11, and OTP-25.3.2.20 contains a vulnerability in the SSH server that may allow an attacker to perform unauthenticated remote code execution (RCE). By exploiting a flaw in SSH protocol message handling, a malicious actor could gain unauthorized access and execute arbitrary commands without valid credentials.
- CVE-2016-10253Critical
An issue was discovered in Erlang/OTP 18.x related to the generation of compiled regular expressions, which is vulnerable to a heap overflow. Regular expressions using a malformed extpattern can indirectly specify an offset used as an array index.
- CVE-2026-75538High
In Erlang/OTP, when using the inet driver with {packet,4} mode, an attacker connecting to an open TCP port can exploit a signed overflow in packet length calculation, potentially overflowing the receive buffer and crashing the BEAM VM.
- CVE-2026-74835High
The httpd HTTP server in the inets application fails to enforce a configured body-size limit on chunked requests. This may allow sending very large requests, potentially leading to server overload.
- CVE-2026-73812High
The check_header/3 function in httpd rejects duplicate Content-Length but does not check for the co-presence of Transfer-Encoding and Content-Length, which can lead to request smuggling desynchronization between front-end and back-end.
- CVE-2026-73276High
Gracefulness code ignored cases that should be rejected, resulting in possible HTTP Request Smuggling opportunities.
- CVE-2026-58227High
A vulnerability in the Erlang/OTP SSL application allows memory exhaustion by sending a crafted certificate chain during TLS/DTLS handshake. Lack of cycle detection in the certificate chain building function causes unbounded recursion, leading to BEAM node crash.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS