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CVE-2026-63627

📛 CVE Title

mppx: Gas Draining with padding

⬇ Download JSON

Description

mppx is a TypeScript interface for machine payments protocol. Prior to 0.8.2, FeePayerPolicy in src/tempo/internal/fee-payer.ts used decodeFunctionData to validate fee-sponsored calldata but did not reject trailing bytes. A client could append nonzero padding that increased intrinsic calldata gas while gas_limit and max_fee_per_gas remained within policy caps, causing the server fee_payer wallet to pay substantially more than the decoded transaction required. The tested 16 KB header limit bounded the demonstrated padding to about 5,500 bytes and produced approximately five times the normal transaction fee. This issue is fixed in version 0.8.2.

Overview

State
PUBLISHED
Assigner (CNA)
GitHub_M
CVSS severity
MEDIUM
CVSS score
CVSS 6.9 / 10 6.9 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 19:07 UTC
Last updated
2026-09-22 19:07 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/63xxx/CVE-2026-63627.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

NVD / KEV / EPSS data refreshed 2026-09-23 02:47 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

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-2026-84805
Assigner
GitHub_M
Published
Sep 22, 2026, 7:07:02 PM
Updated
Sep 22, 2026, 7:07:02 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-727h-3vm5-qwq6

ENISA description: mppx is a TypeScript interface for machine payments protocol. Prior to 0.8.2, FeePayerPolicy in src/tempo/internal/fee-payer.ts used decodeFunctionData to validate fee-sponsored calldata but did not reject trailing bytes. A client could append nonzero padding that increased intrinsic calldata gas while gas_limit and max_fee_per_gas remained within policy caps, causing the server fee_payer wallet to pay substantially more than the decoded transaction required. The tested 16 KB header limit bounded the demonstrated padding to about 5,500 bytes and produced approximately five times the normal transaction fee. This issue is fixed in version 0.8.2.

EUVD references (4)

Affected products (1)
VendorProductVersionsPlatforms
wevm mppx < 0.8.2 (affected) —

Vendor references (4)

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

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.

Remediations (10)

  • July 2026 Critical Patch Update Released | security - Oracle Blogs
    web:blogs.oracle.com

    For more information about the Critical Patch Update program, see the security vulnerability remediation practices page located on the Oracle Trust Center.

    2026-09-23 15:45 UTC
  • 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
  • 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 Security Alert Advisory - CVE-2026-35273
    web:www.oracle.com

    Oracle always recommends that customers remain on actively-supported versions and apply all Critical Patch Updates, Critical Security Patch Updates and Security Alerts without delay. Affected Products and Mitigation Information Security vulnerability addressed by this Security Alert affect the products listed below.

    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-2026-63627.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, FeePayerPolicy in src/tempo/internal/fee-payer.ts used decodeFunctionData to validate fee-sponsored calldata but did not reject trailing bytes. A client could append nonzero padding that increased intrinsic calldata gas while gas_limit and max_fee_per_gas remained within policy caps, causing the server fee_payer wallet to pay substantially more than the decoded transaction required. The tested 16 KB header limit bounded the demonstrated padding to about 5,500 bytes and produced approximately five times the normal transaction fee. 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": "2026-09-22T19:07:02.984Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/wevm/mppx/security/advisories/GHSA-727h-3vm5-qwq6",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/wevm/mppx/security/advisories/GHSA-727h-3vm5-qwq6"
        },
        {
          "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-727h-3vm5-qwq6",
        "discovery": "UNKNOWN"
      },
      "title": "mppx: Gas Draining with padding"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-63627",
    "datePublished": "2026-09-22T19:07:02.984Z",
    "dateReserved": "2026-07-17T14:11:15.482Z",
    "dateUpdated": "2026-09-22T19:07:02.984Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}