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CVE-2026-1664 Insecure Direct Object Reference (IDOR) via Header-Based Email Routing

🗓️ 03 Feb 2026 11:39:18Reported by cloudflareType 
cvelist
 cvelist
🔗 www.cve.org👁 29 Views

IDOR in header-based email routing lets routing to arbitrary Durable Objects via unvalidated Message-ID and References.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-1664
3 Feb 202611:39
attackerkb
CNNVD
Cloudflare Agents 安全漏洞
3 Feb 202600:00
cnnvd
CVE
CVE-2026-1664
3 Feb 202611:39
cve
EUVD
EUVD-2026-5307
3 Feb 202611:39
euvd
Github Security Blog
Cloudflare Agents SDK has Insecure Direct Object Reference (IDOR) via Header-Based Email Routing
3 Feb 202618:42
github
NVD
CVE-2026-1664
3 Feb 202612:16
nvd
OSV
CVE-2026-1664
3 Feb 202612:16
osv
OSV
GHSA-R7X9-8PH7-W8CG Cloudflare Agents SDK has Insecure Direct Object Reference (IDOR) via Header-Based Email Routing
3 Feb 202618:42
osv
Positive Technologies
PT-2026-6054
3 Feb 202600:00
ptsecurity
RedhatCVE
CVE-2026-1664
4 Feb 202613:20
redhatcve
Rows per page
[
  {
    "collectionURL": "https://github.com/cloudflare/agents",
    "defaultStatus": "unaffected",
    "packageName": "agents",
    "repo": "https://github.com/cloudflare/agents",
    "versions": [
      {
        "lessThanOrEqual": "0.3.6",
        "status": "affected",
        "version": "0.0.104",
        "versionType": "semver"
      }
    ]
  }
]

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