FKIE_CVE-2026-26312

Vulnerability from fkie_nvd - Published: 2026-02-19 21:18 - Updated: 2026-02-20 19:40
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-c9gwVendor Advisory, Exploit
Impacted products
Vendor Product Version
stalw stalwart *
To clipboard 

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              "criteria": "cpe:2.3:a:stalw:stalwart:*:*:*:*:*:*:*:*",
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  "descriptions": [
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      "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."
    },
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      "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": "2026-02-20T19:40:52.817",
  "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"
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        "impactScore": 3.6,
        "source": "security-advisories@github.com",
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  "published": "2026-02-19T21:18:31.823",
  "references": [
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      "source": "security-advisories@github.com",
      "tags": [
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        "Exploit"
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      "url": "https://github.com/stalwartlabs/stalwart/security/advisories/GHSA-jm95-876q-c9gw"
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
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      "source": "security-advisories@github.com",
      "type": "Primary"
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}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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