CVE-2026-43633

CriticalCVSS 10.0

Published: 19/05/2026(UTC)Updated: 14/07/2026(UTC)Translated: 15/07/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Elevated risk

1.07%

61th percentile - higher than 61% of all known CVEs

Summary

HestiaCP versions 1.9.0 through 1.9.4 contain a deserialization vulnerability in the web terminal component caused by a session format mismatch between PHP and Node.js. This allows unauthenticated remote attackers to achieve root-level code execution by injecting crafted data into HTTP headers.

Risk Assessment

An attacker can gain full root-level control over the server, leading to complete compromise of the system, data, and services.

Recommendation

Immediately upgrade HestiaCP to version 1.9.5 or later, which fixes this vulnerability. If upgrading is not possible, disable the web terminal component.

Original NVD description (English source)

HestiaCP versions 1.9.0 through 1.9.4 contain a deserialization vulnerability in the web terminal component caused by a session format mismatch between PHP and Node.js that allows unauthenticated remote attackers to achieve root-level code execution. Attackers can inject crafted data into HTTP headers that are processed by the PHP session handler but incorrectly deserialized by the Node.js web terminal component as trusted session values, resulting in arbitrary command execution on systems with the web terminal feature enabled.