Threat Intelligence Database

ConnectBot SSH Client Library is written in Kotlin with Kaitai Struct and KStateMachine. Prior to 0.3.1, DerReader.readLength() accepts excessive long-form DER length octets, accumulates them into an Int, and primitive readers allocate arrays without checking the declared size against the remaining input. An application or user that loads an attacker-provided private-key file through SshClient.authenticatePublicKey(), SshKeys.decodePemPrivateKey(), SshSigning.sign(), or SshSigning.getPublicKey() can trigger integer wraparound, excessive allocation, or an uncaught OutOfMemoryError. SSH server host keys and agent-forwarding messages do not use this application-supplied private-key input path. No usable weakened key and no confidentiality or integrity impact have been demonstrated. This issue is fixed in version 0.3.1.

CVE-2026-54700 is an improper input validation vulnerability in the ConnectBot SSH Client Library (cbssh) prior to version 0.3.1. The SSH protocol parser does not verify that attacker-controlled inner byte lengths and element counts fit within the containing packet, allowing a malicious SSH server to send malformed packets that cause excessive memory allocation or repeated parsing. This can lead to an uncaught OutOfMemoryError and application termination. There is no demonstrated impact on confidentiality or integrity. The issue is fixed in version 0.3.1.