FKIE_CVE-2026-26312

Vulnerability from fkie_nvd - Published: 2026-02-19 21:18 - Updated: 2026-06-17 10:26
Severity
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
Stalwart is a mail and collaboration server. A denial-of-service vulnerability exists in Stalwart Mail Server versions 0.13.0 through 0.15.4 where accessing a specially crafted email containing malformed nested `message/rfc822` MIME parts via IMAP or JMAP causes excessive CPU and memory consumption, potentially leading to an out-of-memory condition and server crash. The malformed structure causes the `mail-parser` crate to produce cyclical references in its parsed representation, which Stalwart then follows indefinitely. Version 0.15.5 contains a patch.
References
security-advisories@github.comhttps://github.com/stalwartlabs/stalwart/security/advisories/GHSA-jm95-876q-c9gwExploit, Vendor Advisory
Impacted products
Vendor Product Version
stalw stalwart *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "stalwart",
          "vendor": "stalwartlabs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.13.0, \u003c 0.15.5"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:stalw:stalwart:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "05786B85-A8FE-4E13-888E-E84AA2D30990",
              "versionEndExcluding": "0.15.5",
              "versionStartIncluding": "0.13.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Stalwart is a mail and collaboration server. A denial-of-service vulnerability exists in Stalwart Mail Server versions 0.13.0 through 0.15.4 where accessing a specially crafted email containing malformed nested `message/rfc822` MIME parts via IMAP or JMAP causes excessive CPU and memory consumption, potentially leading to an out-of-memory condition and server crash. The malformed structure causes the `mail-parser` crate to produce cyclical references in its parsed representation, which Stalwart then follows indefinitely. Version 0.15.5 contains a patch."
    },
    {
      "lang": "es",
      "value": "Stalwart es un servidor de correo y colaboraci\u00f3n. Existe una vulnerabilidad de denegaci\u00f3n de servicio en las versiones 0.13.0 a 0.15.4 de Stalwart Mail Server donde el acceso a un correo electr\u00f3nico especialmente dise\u00f1ado que contiene partes MIME anidadas \u0027message/rfc822\u0027 malformadas a trav\u00e9s de IMAP o JMAP causa un consumo excesivo de CPU y memoria, lo que puede llevar a una condici\u00f3n de falta de memoria y a la ca\u00edda del servidor. La estructura malformada hace que el crate \u0027mail-parser\u0027 produzca referencias c\u00edclicas en su representaci\u00f3n analizada, que Stalwart sigue indefinidamente. La versi\u00f3n 0.15.5 contiene un parche."
    }
  ],
  "id": "CVE-2026-26312",
  "lastModified": "2026-06-17T10:26:04.290",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-26312",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-02-20T19:57:47.994070Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-02-19T21:18:31.823",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/stalwartlabs/stalwart/security/advisories/GHSA-jm95-876q-c9gw"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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