Unbounded Memory Allocation Vulnerability in Stalwart Mail Server

CVE-2025-61600

What is CVE-2025-61600?

The Stalwart Mail and Collaboration Server is susceptible to an unbounded memory allocation vulnerability within its IMAP protocol parser. This issue arises from several state handlers that fail to enforce size limits on dynamic buffers, allowing remote attackers to exploit this flaw. By sending specially crafted requests, attackers can exhaust server memory resources, potentially triggering the system's out-of-memory (OOM) killer, which leads to service outages. While version 0.13.4 addresses this vulnerability, administrators are encouraged to adopt rate limiting and connection monitoring strategies at the network level as interim protective measures.

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