Vulnerability · Published Oct 2, 2025 · Assigned by GitHub_M
CVE-2025-61600Unbounded Memory Allocation in Stalwart IMAP parser
High 7.5
In plain English
A high-severity uncontrolled resource consumption in stalwart from stalwartlabs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities).
Official description
Stalwart is a mail and collaboration server. Versions 0.13.3 and below contain an unbounded memory allocation vulnerability in the IMAP protocol parser which allows remote attackers to exhaust server memory, potentially triggering the system's out-of-memory (OOM) killer and causing a denial of service. The CommandParser implementation enforces size limits on its dynamic buffer in most parsing states, but several state handlers omit these validation checks. This issue is fixed in version 0.13.4. A workaround for this issue is to implement rate limiting and connection monitoring at the network level, however this does not provide complete protection.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| stalwartlabs | stalwart | < 0.13.4 |
Weakness: CWE-400, CWE-789 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H