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CVE-2026-34975

Estado: AnalizadaMedia (4.3)—

Plunk is an open-source email platform built on top of AWS SES. Prior to 0.8.0, a CRLF header injection vulnerability was discovered in SESService.ts, where user-supplied values for from.name, subject, custom header keys/values, and attachment filenames were interpolated directly into raw MIME messages without sanitization. An authenticated API user could inject arbitrary email headers (e.g. Bcc, Reply-To) by embedding carriage return/line feed characters in these fields, enabling silent email forwarding, reply redirection, or sender spoofing. The fix adds input validation at the schema level to reject any of these fields containing \r or \n characters, consistent with the existing validation already applied to the contentId field. This vulnerability is fixed in 0.8.0.

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)

Useplunk — Plunk

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-34975",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-34975",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-04-07T14:19:54.391228Z"
        }
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    ],
    "cvssMetricV31": [
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          "confidentialityImpact": "HIGH"
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          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
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          "confidentialityImpact": "NONE"
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          "versions": [
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              "version": "< 0.8.0"
            }
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  ],
  "published": "2026-04-06T17:17:11.210",
  "references": [
    {
      "url": "https://github.com/useplunk/plunk/security/advisories/GHSA-2mvm-rg5v-7hfq",
      "tags": [
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      ],
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-93"
        }
      ]
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  ],
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    {
      "lang": "en",
      "value": "Plunk is an open-source email platform built on top of AWS SES. Prior to 0.8.0, a CRLF header injection vulnerability was discovered in SESService.ts, where user-supplied values for from.name, subject, custom header keys/values, and attachment filenames were interpolated directly into raw MIME messages without sanitization. An authenticated API user could inject arbitrary email headers (e.g. Bcc, Reply-To) by embedding carriage return/line feed characters in these fields, enabling silent email forwarding, reply redirection, or sender spoofing. The fix adds input validation at the schema level to reject any of these fields containing \\r or \\n characters, consistent with the existing validation already applied to the contentId field. This vulnerability is fixed in 0.8.0."
    }
  ],
  "lastModified": "2026-06-17T10:39:55.527",
  "configurations": [
    {
      "nodes": [
        {
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          "cpeMatch": [
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              "versionEndExcluding": "0.8.0"
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  "sourceIdentifier": "security-advisories@github.com"
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