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4 vulnerabilities found for stalwart by stalwartlabs

CVE-2025-61600 (GCVE-0-2025-61600)

Vulnerability from cvelistv5 – Published: 2025-10-02 21:30 – Updated: 2025-10-03 13:39
VLAI?
Title
Unbounded Memory Allocation in Stalwart IMAP parser
Summary
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.
Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-789 - Memory Allocation with Excessive Size Value
Assigner
References
Impacted products
Vendor Product Version
stalwartlabs stalwart Affected: < 0.13.4
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2025-59045 (GCVE-0-2025-59045)

Vulnerability from cvelistv5 – Published: 2025-09-10 16:09 – Updated: 2025-09-11 13:28
VLAI?
Title
Stalwart vulnerable to Memory Exhaustion via CalDAV Event Expansion
Summary
Stalwart is a mail and collaboration server. Starting in version 0.12.0 and prior to version 0.13.3, a memory exhaustion vulnerability exists in Stalwart's CalDAV implementation that allows authenticated attackers to cause denial-of-service by triggering unbounded memory consumption through recurring event expansion. An authenticated attacker can crash the Stalwart server by creating recurring events with large payloads and triggering their expansion through CalDAV REPORT requests. A single malicious request expanding 300 events with 1000-character descriptions can consume up to 2 GB of memory. The vulnerability exists in the `ArchivedCalendarEventData.expand` function, which processes CalDAV `REPORT` requests with event expansion. When a client requests recurring events in their expanded form using the `<C:expand>` element, the server stores all expanded event instances in memory without enforcing size limits. Users should upgrade to Stalwart version 0.13.3 or later to receive a fix. If immediate upgrading is not possible, implement memory limits at the container/system level; monitor server memory usage for unusual spikes; consider rate limiting CalDAV REPORT requests; and restrict CalDAV access to trusted users only.
Severity ?
7.1 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CWE
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
Impacted products
Vendor Product Version
stalwartlabs stalwart Affected: >= 0.12.0, < 0.13.3
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2025-61600 (GCVE-0-2025-61600)

Vulnerability from nvd – Published: 2025-10-02 21:30 – Updated: 2025-10-03 13:39
VLAI?
Title
Unbounded Memory Allocation in Stalwart IMAP parser
Summary
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.
Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-789 - Memory Allocation with Excessive Size Value
Assigner
References
Impacted products
Vendor Product Version
stalwartlabs stalwart Affected: < 0.13.4
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2025-59045 (GCVE-0-2025-59045)

Vulnerability from nvd – Published: 2025-09-10 16:09 – Updated: 2025-09-11 13:28
VLAI?
Title
Stalwart vulnerable to Memory Exhaustion via CalDAV Event Expansion
Summary
Stalwart is a mail and collaboration server. Starting in version 0.12.0 and prior to version 0.13.3, a memory exhaustion vulnerability exists in Stalwart's CalDAV implementation that allows authenticated attackers to cause denial-of-service by triggering unbounded memory consumption through recurring event expansion. An authenticated attacker can crash the Stalwart server by creating recurring events with large payloads and triggering their expansion through CalDAV REPORT requests. A single malicious request expanding 300 events with 1000-character descriptions can consume up to 2 GB of memory. The vulnerability exists in the `ArchivedCalendarEventData.expand` function, which processes CalDAV `REPORT` requests with event expansion. When a client requests recurring events in their expanded form using the `<C:expand>` element, the server stores all expanded event instances in memory without enforcing size limits. Users should upgrade to Stalwart version 0.13.3 or later to receive a fix. If immediate upgrading is not possible, implement memory limits at the container/system level; monitor server memory usage for unusual spikes; consider rate limiting CalDAV REPORT requests; and restrict CalDAV access to trusted users only.
Severity ?
7.1 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CWE
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
Impacted products
Vendor Product Version
stalwartlabs stalwart Affected: >= 0.12.0, < 0.13.3
Create a notification for this product.
Show details on NVD website
To clipboard 

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      "references": [
        {
          "name": "https://github.com/stalwartlabs/stalwart/security/advisories/GHSA-xv4r-q6gr-6pfg",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/stalwartlabs/stalwart/security/advisories/GHSA-xv4r-q6gr-6pfg"
        },
        {
          "name": "https://github.com/stalwartlabs/stalwart/commit/15762fba2ba335e560b8d25f71af085a8b6b6cf2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/stalwartlabs/stalwart/commit/15762fba2ba335e560b8d25f71af085a8b6b6cf2"
        },
        {
          "name": "https://github.com/stalwartlabs/stalwart/blob/main/CHANGELOG.md",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/stalwartlabs/stalwart/blob/main/CHANGELOG.md"
        },
        {
          "name": "https://github.com/stalwartlabs/stalwart/releases/tag/v0.13.3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/stalwartlabs/stalwart/releases/tag/v0.13.3"
        },
        {
          "name": "https://tools.ietf.org/html/rfc4791",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://tools.ietf.org/html/rfc4791"
        }
      ],
      "source": {
        "advisory": "GHSA-xv4r-q6gr-6pfg",
        "discovery": "UNKNOWN"
      },
      "title": "Stalwart vulnerable to Memory Exhaustion via CalDAV Event Expansion"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2025-59045",
    "datePublished": "2025-09-10T16:09:49.485Z",
    "dateReserved": "2025-09-08T16:19:26.172Z",
    "dateUpdated": "2025-09-11T13:28:45.110Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}