CVE-2026-45577: Neotoma Unauthenticated Inspector/API Access Vulnerability

MODERATE
Advisory Identifier: GHSA-5cvp-p7p4-mcx9
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CWE-306 CWE-288
Published
Advisory Summary

CVE-2026-45577 is a MODERATE unauthenticated inspector/api access vulnerability (CWE-306: Missing Authentication for Critical Function) affecting Neotoma libraries in the npm ecosystem. The issue involves unauthenticated inspector/api access via reverse-proxy loopback auth bypass. Remediation is available by upgrading affected packages to version 0.11.1.

CVE-2026-45577 at a Glance

CVE Identifier CVE-2026-45577
GHSA Identifier GHSA-5cvp-p7p4-mcx9
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-306: Missing Authentication for Critical Function
Affected Product Neotoma
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2026-45577

To remediate this vulnerability, upgrade all affected Neotoma dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

neotoma fixed: 0.11.1 
npm install neotoma@0.11.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls neotoma

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-45577, inspect your project dependencies using npm:

npm ls neotoma

Analyze the terminal output to locate any version of Neotoma in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.11.1), your application is affected.

Note: The npm ls neotoma command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-306: Missing Authentication for Critical Function, where the product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. In Neotoma, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Neotoma versions starting at v0.6.0 can treat public reverse-proxied requests as local when the app receives them over a loopback socket and no Bearer token is present. In affected deployments, the REST auth middleware can resolve unauthenticated requests as the local development user, making the hosted Inspector and related API surface reachable without credentials. Impact: unauthorized access to production data exposed through the Inspector/API on affected deployments. Affected condition: a public deployment behind a reverse proxy or same-host tunnel that forwards traffic to the Node process over loopback. Remediation implemented on the main branch: local-request detection now fails closed in production unless loopback trust is explicitly enabled, and forwarded public clients remain remote. Patched release version is pending; this draft will be updated once the fix is released.

CVE-2026-45577 Affected Neotoma Versions

1 component(s)
Fixed Versions:
0.11.1
Product / Package Ecosystem Affected Versions Fixed Version
neotoma
npm/neotoma
npm
≥ 0.6.0
< 0.11.1
0.11.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/markmhendrickson/neotoma/security/advisories/GHSA-5cvp-p7p4-mcx9
NVD — CVE-2026-45577 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45577
Neotoma Source Repository REPOSITORY
https://github.com/markmhendrickson/neotoma
Neotoma Release RELEASE
https://github.com/markmhendrickson/neotoma/releases/tag/v0.11.1

Frequently Asked Questions

What is CVE-2026-45577?
CVE-2026-45577 is a security vulnerability in Neotoma involving Unauthenticated Inspector/API access via reverse-proxy loopback auth bypass under CWE-306: Missing Authentication for Critical Function.
Which Neotoma versions are affected?
Affected versions include releases prior to 0.11.1 across affected packages: neotoma.
What version fixes CVE-2026-45577?
Upgrading to 0.11.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is neotoma affected?
Yes, neotoma is affected in releases prior to 0.11.1. Upgrade your dependency to 0.11.1 or later.
What CWE is associated with CVE-2026-45577?
CVE-2026-45577 is classified under CWE-306: Missing Authentication for Critical Function (The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.).
How can I check npm dependencies for CVE-2026-45577?
Run the dependency tree command: 'npm ls neotoma'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-5cvp-p7p4-mcx9",
  "modified" : "2026-06-09T10:30:37Z",
  "published" : "2026-05-18T14:20:06Z",
  "aliases" : [ "CVE-2026-45577" ],
  "summary" : "Neotoma: Unauthenticated Inspector/API access via reverse-proxy loopback auth bypass",
  "details" : "Neotoma versions starting at v0.6.0 can treat public reverse-proxied requests as local when the app receives them over a loopback socket and no Bearer token is present.\n\nIn affected deployments, the REST auth middleware can resolve unauthenticated requests as the local development user, making the hosted Inspector and related API surface reachable without credentials.\n\nImpact: unauthorized access to production data exposed through the Inspector/API on affected deployments.\n\nAffected condition: a public deployment behind a reverse proxy or same-host tunnel that forwards traffic to the Node process over loopback.\n\nRemediation implemented on the main branch: local-request detection now fails closed in production unless loopback trust is explicitly enabled, and forwarded public clients remain remote.\n\nPatched release version is pending; this draft will be updated once the fix is released.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "neotoma"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.6.0"
      }, {
        "fixed" : "0.11.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/markmhendrickson/neotoma/security/advisories/GHSA-5cvp-p7p4-mcx9"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-45577"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/markmhendrickson/neotoma"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/markmhendrickson/neotoma/releases/tag/v0.11.1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-288", "CWE-306" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-18T14:20:06Z",
    "nvd_published_at" : "2026-05-29T18:17:10Z"
  }
}