CVE-2026-63628

Description

mppx is a TypeScript interface for machine payments protocol. Prior to 0.8.2, the fee-payer cosigning path in src/tempo/internal/fee-payer.ts copied a client-supplied access_list from a 0x78 FeePayerEnvelope without validating its length or contents. Because EIP-2930 access-list entries consume intrinsic gas even when the listed addresses are never used, a client could add fabricated address-only entries and cause the server fee_payer wallet to pay unnecessary transaction fees. The demonstrated 180-entry list remained within the 500,000 gas policy cap, 16 KB header limit, and RPC simulation budget while increasing the fee by approximately 9.4 times. This issue is fixed in version 0.8.2.

Overview

State: PUBLISHED
Assigner (CNA): GitHub_M
CVSS severity: MEDIUM
CVSS score: 6.9 / 10
CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Effective score: 6.9 / 10 MEDIUM source: CNA overview
CWE(s): CWE-20
Reserved: 2026-07-17
Published: 2026-09-22 19:09 UTC
Last updated: 2026-09-22 19:09 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/63xxx/CVE-2026-63628.json

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-09-22 20:17:04 UTC
NVD last modified: 2026-09-22 20:17:04 UTC

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-84806
Assigner: GitHub_M
Published: Sep 22, 2026, 7:09:38 PM
Updated: Sep 22, 2026, 7:09:38 PM
EUVD base score (CVSS 4.0): 6.9 / 10
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
EUVD-reported EPSS: 0.0000
Vendors: wevm
Products: mppx (< 0.8.2)
Aliases: GHSA-vc9j-9wph-qghj

ENISA description: mppx is a TypeScript interface for machine payments protocol. Prior to 0.8.2, the fee-payer cosigning path in src/tempo/internal/fee-payer.ts copied a client-supplied access_list from a 0x78 FeePayerEnvelope without validating its length or contents. Because EIP-2930 access-list entries consume intrinsic gas even when the listed addresses are never used, a client could add fabricated address-only entries and cause the server fee_payer wallet to pay unnecessary transaction fees. The demonstrated 180-entry list remained within the 500,000 gas policy cap, 16 KB header limit, and RPC simulation budget while increasing the fee by approximately 9.4 times. This issue is fixed in version 0.8.2.

EUVD references (4)

Affected products (1)

Vendor	Product	Versions	Platforms
wevm	mppx	`< 0.8.2` (affected)	—

Vendor references (4)

References embedded in the original CVE record by the assigning CNA.

https://github.com/wevm/mppx/security/advisories/GHSA-vc9j-9wph-qghj x_refsource_CONFIRM
https://github.com/wevm/mppx/pull/602 x_refsource_MISC
https://github.com/wevm/mppx/commit/24ddcca719ae282977d8747309ed1275ea282b25 x_refsource_MISC
https://github.com/wevm/mppx/releases/tag/mppx@0.8.2 x_refsource_MISC

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (4)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://github.com/wevm/mppx/commit/24ddcca719ae282977d8747309ed1275ea282b25 security-advisories@github.com
https://github.com/wevm/mppx/pull/602 security-advisories@github.com
https://github.com/wevm/mppx/releases/tag/mppx@0.8.2 security-advisories@github.com
https://github.com/wevm/mppx/security/advisories/GHSA-vc9j-9wph-qghj security-advisories@github.com

Remediations (10)

Cisco Advance Notification for Publication of September 16, 2026 ...

web:sec.cloudapps.cisco.com

On September 16, 2026 , the Cisco Product Security Incident Response Team (PSIRT) published the advisories that are listed in the following tables. To remediate these vulnerabilities, Cisco strongly recommends that customers upgrade to the fixed software that is indicated in the advisories. For more information about changes in Cisco PSIRT vulnerability disclosure, see Strengthening the ...

2026-09-23 15:45 UTC
Microsoft Patch Tracker (September 2026): Exploit-Ranked | Senserva

web:senserva.com

Every Microsoft security patch (KB) and the CVEs it fixes, with severity, CVSS, and CISA KEV status. Cross-linked to the CVE reference.

2026-09-23 15:45 UTC
Description of the security update for Office 2016: August 11, 2026 ...

web:support.microsoft.com

Be aware that the update in the Microsoft Download Center applies to the Microsoft Installer (.msi)-based edition of Office 2016. It doesn't apply to the Office 2016 Click-to-Run editions, such as Microsoft Office 365 Home. (See What version of Office am I using?) How to get and install the update Method 1: Microsoft Update This update is available from Microsoft Update. When you turn on ...

2026-09-23 15:45 UTC
SAP Security Patch Day - June 2026

web:support.sap.com

SAP security Patch Day Bulletin This post shares the information on security notes that remediate vulnerabilities discovered in SAP products. SAP strongly recommends that the customer visits the support portal and applies patches on priority to protect their SAP landscape. On 9th of June 2026 , SAP security patch day saw the release of 15 new security notes.

2026-09-23 15:45 UTC
SAP Security Patch Day - May 2026

web:support.sap.com

SAP security Patch Day Bulletin This post shares the information on security notes that remediate vulnerabilities discovered in SAP products. SAP strongly recommends that the customer visits the support portal and applies patches on priority to protect their SAP landscape. On 12 th of May 2026 , SAP security patch day saw the release of 15 new security notes.

2026-09-23 15:45 UTC
CVE-2026-0628: Patch Chrome Edge WebView Bug in Chromium 143

web:windowsforum.com

A high‑severity Chromium vulnerability, tracked as CVE‑2026‑0628, was disclosed in early January 2026 and patched upstream in Chrome 143.x; Microsoft has recorded the same CVE in its Security Update Guide (SUG) to tell Edge customers when their downstream Microsoft Edge builds have ingested the Chromium fix .

2026-09-23 15:45 UTC
DSA-2026-163: Security Update for Dell AppSync Vulnerabilities

web:www.dell.com

Dell AppSync remediation is available for multiple security vulnerabilities that could be exploited by malicious users to compromise the affected system.

2026-09-23 15:45 UTC
Oracle Critical Patch Update Advisory - July 2026

web:www.oracle.com

This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-23 15:45 UTC
Oracle Critical Security Patch Update Advisory - June 2026

web:www.oracle.com

Additional CVEs addressed are: The patch for CVE - 2026 -34481 also addresses CVE - 2026 -34477, CVE - 2026 -34478, CVE - 2026 -34479, and CVE - 2026 -34480. Oracle Fusion Middleware Risk Matrix This Critical Security Patch Update contains 106 new security patches for Oracle Fusion Middleware. 53 of these vulnerabilities may be remotely exploitable without authentication, i.e., may be exploited over a ...

2026-09-23 15:45 UTC
Patch Tuesday September 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's September 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-09-23 15:45 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-63628.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "mppx",
          "vendor": "wevm",
          "versions": [
            {
              "status": "affected",
              "version": "< 0.8.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "mppx is a TypeScript interface for machine payments protocol. Prior to 0.8.2, the fee-payer cosigning path in src/tempo/internal/fee-payer.ts copied a client-supplied access_list from a 0x78 FeePayerEnvelope without validating its length or contents. Because EIP-2930 access-list entries consume intrinsic gas even when the listed addresses are never used, a client could add fabricated address-only entries and cause the server fee_payer wallet to pay unnecessary transaction fees. The demonstrated 180-entry list remained within the 500,000 gas policy cap, 16 KB header limit, and RPC simulation budget while increasing the fee by approximately 9.4 times. This issue is fixed in version 0.8.2."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-20",
              "description": "CWE-20: Improper Input Validation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-22T19:09:38.414Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/wevm/mppx/security/advisories/GHSA-vc9j-9wph-qghj",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/wevm/mppx/security/advisories/GHSA-vc9j-9wph-qghj"
        },
        {
          "name": "https://github.com/wevm/mppx/pull/602",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/wevm/mppx/pull/602"
        },
        {
          "name": "https://github.com/wevm/mppx/commit/24ddcca719ae282977d8747309ed1275ea282b25",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/wevm/mppx/commit/24ddcca719ae282977d8747309ed1275ea282b25"
        },
        {
          "name": "https://github.com/wevm/mppx/releases/tag/mppx@0.8.2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/wevm/mppx/releases/tag/mppx@0.8.2"
        }
      ],
      "source": {
        "advisory": "GHSA-vc9j-9wph-qghj",
        "discovery": "UNKNOWN"
      },
      "title": "mppx: Gas Draining with access list"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-63628",
    "datePublished": "2026-09-22T19:09:38.414Z",
    "dateReserved": "2026-07-17T14:11:15.482Z",
    "dateUpdated": "2026-09-22T19:09:38.414Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}