CVE-2026-34210: Mppx Mppx Has Stripe Charge Credential Vulnerability

MODERATE
Advisory Identifier: GHSA-8mhj-rffc-rcvw
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CWE-697
Published
Advisory Summary

CVE-2026-34210 is a MODERATE mppx has stripe charge credential vulnerability (CWE-697: Incorrect Comparison) affecting Mppx libraries in the npm ecosystem. The issue involves mppx has stripe charge credential replay via missing idempotency check. Remediation is available by upgrading affected packages to version 0.4.11.

CVE-2026-34210 at a Glance

CVE Identifier CVE-2026-34210
GHSA Identifier GHSA-8mhj-rffc-rcvw
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-697: Incorrect Comparison
Affected Product Mppx
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2026-34210

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

mppx fixed: 0.4.11 
npm install mppx@0.4.11
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 mppx

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-34210, inspect your project dependencies using npm:

npm ls mppx

Analyze the terminal output to locate any version of Mppx in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.4.11), your application is affected.

Note: The npm ls mppx 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-697: Incorrect Comparison, where the product compares two entities in a security-relevant context, but the comparison is incorrect. In Mppx, 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

### Impact The `stripe/charge` payment method did not check Stripe's `Idempotent-Replayed` response header when creating PaymentIntents. An attacker could replay a valid credential containing the same `spt` token against a new challenge, and the server would accept the replayed Stripe PaymentIntent as a new successful payment without actually charging the customer again. This allowed an attacker to pay once and consume unlimited resources by replaying the credential. ### Patches Fixed in 0.4.11. The server now checks the `Idempotent-Replayed` header and rejects replayed PaymentIntents. ### Workarounds There are no workarounds available for this vulnerability.

CVE-2026-34210 Affected Mppx Versions

1 component(s)
Fixed Versions:
0.4.11
Product / Package Ecosystem Affected Versions Fixed Version
mppx
npm/mppx
npm
< 0.4.11
0.4.11

References

GitHub Advisory / Wiki ADVISORY
https://github.com/wevm/mppx/security/advisories/GHSA-8mhj-rffc-rcvw
NVD — CVE-2026-34210 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34210
Security Fix Commit FIX COMMIT
https://github.com/wevm/mppx/commit/b2b1a0b60506fc71aa80b8a025084949dca1a994
Mppx Source Repository REPOSITORY
https://github.com/wevm/mppx
Mppx Release RELEASE
https://github.com/wevm/mppx/releases/tag/mppx%400.4.11
Mppx Release RELEASE
https://github.com/wevm/mppx/releases/tag/mppx@0.4.11

Frequently Asked Questions

What is CVE-2026-34210?
CVE-2026-34210 is a security vulnerability in Mppx involving mppx has Stripe charge credential replay via missing idempotency check under CWE-697: Incorrect Comparison.
Which Mppx versions are affected?
Affected versions include releases prior to 0.4.11 across affected packages: mppx.
What version fixes CVE-2026-34210?
Upgrading to 0.4.11 (or the latest patched release for your respective branch) resolves the vulnerability.
Is mppx affected?
Yes, mppx is affected in releases prior to 0.4.11. Upgrade your dependency to 0.4.11 or later.
What CWE is associated with CVE-2026-34210?
CVE-2026-34210 is classified under CWE-697: Incorrect Comparison (The product compares two entities in a security-relevant context, but the comparison is incorrect.).
How can I check npm dependencies for CVE-2026-34210?
Run the dependency tree command: 'npm ls mppx'. 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-8mhj-rffc-rcvw",
  "modified" : "2026-03-31T18:51:18Z",
  "published" : "2026-03-29T15:11:30Z",
  "aliases" : [ "CVE-2026-34210" ],
  "summary" : "mppx has Stripe charge credential replay via missing idempotency check",
  "details" : "### Impact\n\nThe `stripe/charge` payment method did not check Stripe's `Idempotent-Replayed` response header when creating PaymentIntents. An attacker could replay a valid credential containing the same `spt` token against a new challenge, and the server would accept the replayed Stripe PaymentIntent as a new successful payment without actually charging the customer again. This allowed an attacker to pay once and consume unlimited resources by replaying the credential.\n\n### Patches\n\nFixed in 0.4.11. The server now checks the `Idempotent-Replayed` header and rejects replayed PaymentIntents.\n\n### Workarounds\n\nThere are no workarounds available for this vulnerability.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "mppx"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.4.11"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/wevm/mppx/security/advisories/GHSA-8mhj-rffc-rcvw"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-34210"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/wevm/mppx/commit/b2b1a0b60506fc71aa80b8a025084949dca1a994"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/wevm/mppx"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/wevm/mppx/releases/tag/mppx%400.4.11"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/wevm/mppx/releases/tag/mppx@0.4.11"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-697" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-29T15:11:30Z",
    "nvd_published_at" : "2026-03-31T15:16:18Z"
  }
}