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Vulnerability record · CVE-2025-61600 · published 2 October 2025

CVE-2025-61600: Uncontrolled resource consumption vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.56% · top 55.5% CWE-400 · Uncontrolled resource consumptionCWE-789 · CWE-789 Deferred
7.5CVSS 3.1 base score
0.56%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

LinkTags
https://github.com/stalwartlabs/stalwart/commit/a8e631e881bded8128358732f18e02ca94a4e677
https://github.com/stalwartlabs/stalwart/releases/tag/v0.13.4
https://github.com/stalwartlabs/stalwart/security/advisories/GHSA-8jqj-qj5p-v5rr

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Source: NIST National Vulnerability Database (record CVE-2025-61600), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.