CVE-2025-30211 — KEX init error results with excessive memory usage

Affected: erlang otp

Erlang/OTP is a set of libraries for the Erlang programming language. Prior to versions OTP-27.3.1, 26.2.5.10, and 25.3.2.19, a maliciously formed KEX init message can result with high memory usage. Implementation does not verify RFC specified limits on algorithm names (64 characters) provided in KEX init message. Big KEX init packet may lead to inefficient processing of the error data. As a result, large amount of memory will be allocated for processing malicious data. Versions OTP-27.3.1, OTP-26.2.5.10, and OTP-25.3.2.19 fix the issue. Some workarounds are available. One may set option `parallel_login` to `false` and/or reduce the `max_sessions` option.

USN-7425-1 — erlang vulnerability

Affected: Ubuntu:20.04:LTS: erlang, Ubuntu:22.04:LTS: erlang, Ubuntu:24.04:LTS: erlang

It was discovered that Erlang OTP's SSH module did not limit the size of certain data in initialization messages. An attacker could possibly use this issue to consume large amount of memory leading to a denial of service.

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CVE-2025-30211 — KEX init error results with excessive memory usage

USN-7425-1 — erlang vulnerability