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CVE-2026-23829

Estado: AnalizadaMedia (5.3)—

Mailpit is an email testing tool and API for developers. Prior to version 1.28.3, Mailpit's SMTP server is vulnerable to Header Injection due to an insufficient Regular Expression used to validate `RCPT TO` and `MAIL FROM` addresses. An attacker can inject arbitrary SMTP headers (or corrupt existing ones) by including carriage return characters (`\r`) in the email address. This header injection occurs because the regex intended to filter control characters fails to exclude `\r` and `\n` when used inside a character class. Version 1.28.3 fixes this issue.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Axllent — Mailpit

CWE

Referencias

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{
  "id": "CVE-2026-23829",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-23829",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-01-20T20:08:32.596156Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
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      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "axllent",
          "product": "mailpit",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.28.3"
            }
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      ]
    }
  ],
  "published": "2026-01-19T00:15:48.707",
  "references": [
    {
      "url": "https://github.com/axllent/mailpit/commit/36cc06c125954dec6673219dafa084e13cc14534",
      "tags": [
        "Patch"
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      "source": "security-advisories@github.com"
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      "url": "https://github.com/axllent/mailpit/releases/tag/v1.28.3",
      "tags": [
        "Product",
        "Release Notes"
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      "source": "security-advisories@github.com"
    },
    {
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      "tags": [
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        "Mitigation",
        "Third Party Advisory"
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  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-93"
        },
        {
          "lang": "en",
          "value": "CWE-150"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Mailpit is an email testing tool and API for developers. Prior to version 1.28.3, Mailpit's SMTP server is vulnerable to Header Injection due to an insufficient Regular Expression used to validate `RCPT TO` and `MAIL FROM` addresses. An attacker can inject arbitrary SMTP headers (or corrupt existing ones) by including carriage return characters (`\\r`) in the email address. This header injection occurs because the regex intended to filter control characters fails to exclude `\\r` and `\\n` when used inside a character class. Version 1.28.3 fixes this issue."
    },
    {
      "lang": "es",
      "value": "Mailpit es una herramienta de pruebas de correo electrónico y una API para desarrolladores. Antes de la versión 1.28.3, el servidor SMTP de Mailpit era vulnerable a la inyección de encabezados debido a una expresión regular insuficiente utilizada para validar las direcciones `RCPT TO` y `MAIL FROM`. Un atacante puede inyectar encabezados SMTP arbitrarios (o corromper los existentes) incluyendo caracteres de retorno de carro (\"\\r\") en la dirección de correo electrónico. Esta inyección de encabezados se produce porque la expresión regular destinada a filtrar los caracteres de control no excluye \"\\r\" y \"\\n\" cuando se utiliza dentro de una clase de caracteres. La versión 1.28.3 corrige este problema."
    }
  ],
  "lastModified": "2026-06-17T10:22:10.143",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:axllent:mailpit:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D00C1680-049F-472C-A900-66D6B2A11A04",
              "versionEndExcluding": "1.28.3"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security-advisories@github.com"
}