ETK-2026-3897Zero's internal tracking ID, independent of the CVE number.

{
  "etk_id": "ETK-2026-3897",
  "cve_id": null,
  "display_id": "ETK-2026-3897",
  "ghsa_id": "GHSA-w8w6-94hg-2qpm",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Mail header injection in go-mail List-Unsubscribe handling",
  "summary": "github.com/wneessen/go-mail before 0.8.2 can generate altered email headers through its List-Unsubscribe handling. An attacker may influence message routing or add headers when an application passes untrusted input to Msg.SetListUnsubscribe.",
  "mitigation": "Upgrade github.com/wneessen/go-mail to version 0.8.2 or later. Until upgraded, do not pass untrusted values to Msg.SetListUnsubscribe and reject input containing line breaks.",
  "vendor": "go",
  "product": "go:github.com/wneessen/go-mail",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "0.8.1"
      ],
      "ecosystem": "go",
      "fixed_versions": [
        "0.8.2"
      ],
      "package_name": "github.com/wneessen/go-mail",
      "purl": "pkg:golang/github.com/wneessen/go-mail"
    }
  ],
  "cwes": [
    93
  ],
  "cvss_score": 7.1,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 6.93219265,
  "t0_at": null,
  "signals": {
    "public_poc": {
      "at": "2026-11-08T14:08:38+00:00",
      "days": -2.669181792974537,
      "is_lower_bound": true,
      "measured_at": "2026-11-11T06:12:15.348347+00:00",
      "url": "https://github.com/wneessen/go-mail/security/advisories/GHSA-w8w6-94hg-2qpm"
    },
    "trigger_signal": {
      "at": "2026-11-08T14:08:38+00:00",
      "days": -2.669181792974537,
      "is_lower_bound": true,
      "measured_at": "2026-11-11T06:12:15.348347+00:00",
      "url": "https://github.com/wneessen/go-mail/security/advisories/GHSA-w8w6-94hg-2qpm"
    }
  }
}