Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-08-07T00:00:00 codepr sol: Sol: Denial of service via resource exhaustion from malformed CONNECT packets 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CWE-772

In sol commit 373d848 (2024-12-12), the broker does not fully release resources when handling malformed or duplicate CONNECT packets. When clients send invalid CONNECT packets - either due to repeated attempts or failed authentication - the server may silently drop the connection or send a CONNACK but fail to close the session or deallocate internal resources. This behavior allows an attacker to create numerous half-open connections that consume memory and file descriptors indefinitely, potentially triggering the Linux OOM killer and causing a denial of service.

A flaw was found in sol. The broker does not fully release resources when handling malformed or duplicate CONNECT packets. A remote attacker can send invalid CONNECT packets, which may cause the server to silently drop the connection or send a CONNACK without properly closing the session or deallocating internal resources. This behavior allows an attacker to create numerous half-open connections, consuming memory and file descriptors indefinitely, potentially leading to a denial of service.

https://www.cve.org/CVERecord?id=CVE-2025-63235 https://nvd.nist.gov/vuln/detail/CVE-2025-63235 https://github.com/codepr/sol/issues/12 https://github.com/peter-pe/sol-vulnerabilities/blob/main/CVE-2025-63235.md