GHSA-r7x9-8ph7-w8cg

Source

https://github.com/advisories/GHSA-r7x9-8ph7-w8cg

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-r7x9-8ph7-w8cg/GHSA-r7x9-8ph7-w8cg.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-r7x9-8ph7-w8cg

Aliases

CVE-2026-1664

Published

2026-02-03T18:42:01Z

Modified

2026-02-22T23:26:19Z

Severity

6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N CVSS Calculator

Summary

Cloudflare Agents SDK has Insecure Direct Object Reference (IDOR) via Header-Based Email Routing

Details

Summary

An Insecure Direct Object Reference (CWE-639) has been found to exist in createHeaderBasedEmailResolver() function within the Cloudflare Agents SDK. The issue occurs because the Message-ID and References headers are parsed to derive the target agentName and agentId without proper validation or origin checks, allowing an external attacker with control of these headers to route inbound mail to arbitrary Durable Object instances and namespaces.

Root cause

The createHeaderBasedEmailResolver() function lacks cryptographic verification or origin validation for the headers used in the routing logic, effectively allowing external input to dictate internal object routing.

Impact

Insecure Direct Object Reference (IDOR) in email routing lets an attacker steer inbound mail to arbitrary Agent instances via spoofed Message-ID.

Patches

Agents-sdk users should upgrade to agents@0.3.7. PR: https://github.com/cloudflare/agents/pull/811 This documentation provides the necessary architectural context for coding agents to mitigate the issue by refactoring the resolver to enforce strict identity boundaries.

Database specific

{
    "cwe_ids":  [
        "CWE-639"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-02-03T18:42:01Z",
    "nvd_published_at":  "2026-02-03T12:16:11Z",
    "severity":  "MODERATE"
}

References

Affected packages

npm / agents

Package

Name: agents; View open source insights on deps.dev
Purl: pkg:npm/agents

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

0.3.7

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-r7x9-8ph7-w8cg/GHSA-r7x9-8ph7-w8cg.json"