CVE-2026-54700

MediumCVSS 6.9

Published: 13/10/2026(UTC)Updated: 16/10/2026(UTC)Translated: 13/10/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.37%

29th percentile - higher than 29% of all known CVEs

Summary

In ConnectBot SSH Client Library prior to 0.3.1, the SSH protocol parser trusts attacker-controlled inner byte lengths and element counts without verifying that they fit in the containing packet. A malicious or compromised SSH server can return a small malformed packet whose oversized declarations cause excessive allocation or repeated parsing, leading to an uncaught OutOfMemoryError and termination of the application process.

Risk Assessment

The client application may crash (denial of service) after connecting to a malicious SSH server; no confidentiality or integrity impact has been demonstrated.

Recommendation

Update ConnectBot SSH Client Library to version 0.3.1 or later.

Other vulnerabilities in ConnectBot SSH Client Library

CVE-2026-54697Medium
In ConnectBot SSH Client Library 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. Loading 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.

Original NVD description (English source)

ConnectBot SSH Client Library is written in Kotlin with Kaitai Struct and KStateMachine. Prior to 0.3.1, the SSH protocol parser trusts attacker-controlled inner byte lengths and element counts without verifying that they fit in the containing packet. A malicious or compromised SSH server can return a small malformed packet whose oversized declarations cause the Kaitai Struct Java runtime to attempt excessive allocation or repeated parsing before detecting truncated input. The general transport path requires a client connection but no authentication or optional feature; malformed SSH-agent messages additionally require SSH agent forwarding. The issue can raise an uncaught OutOfMemoryError and terminate the application process, with no demonstrated confidentiality or integrity impact. This issue is fixed in version 0.3.1.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS