CVE-2026-63628

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Source
https://cve.org/CVERecord?id=CVE-2026-63628
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63628.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-63628
Aliases
Published
2026-09-22T19:09:38Z
Modified
2026-09-24T03:45:43Z
Severity
  • 6.9 (Medium) CVSS_V4 - 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 CVSS Calculator
Summary
mppx: Gas Draining with access list
Details

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.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-20"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63628.json"
}
References

Affected packages

Git / github.com/wevm/mppx

Affected ranges

Type
GIT
Repo
https://github.com/wevm/mppx
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
24ddcca719ae282977d8747309ed1275ea282b25
Fixed
831dd0a72aa35e5f7876b65ca4b4f8a645c9dc89
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "0.8.2"
        }
    ],
    "source":  [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

mpay@0.*
mpay@0.1.0
mpay@0.2.0
mpay@0.2.1
mpay@0.2.2
mpay@0.2.3
mpay@0.2.4
mppx@0.*
mppx@0.1.0
mppx@0.1.1
mppx@0.2.0
mppx@0.2.1
mppx@0.2.2
mppx@0.2.3
mppx@0.2.4
mppx@0.2.5
mppx@0.2.6
mppx@0.3.1
mppx@0.3.11
mppx@0.3.12
mppx@0.3.13
mppx@0.3.14
mppx@0.3.15
mppx@0.3.16
mppx@0.3.2
mppx@0.3.3
mppx@0.3.4
mppx@0.3.5
mppx@0.3.6
mppx@0.3.7
mppx@0.3.8
mppx@0.3.9
mppx@0.4.0
mppx@0.4.1
mppx@0.4.10
mppx@0.4.11
mppx@0.4.12
mppx@0.4.2
mppx@0.4.3
mppx@0.4.4
mppx@0.4.5
mppx@0.4.6
mppx@0.4.7
mppx@0.4.8
mppx@0.4.9
mppx@0.5.0
mppx@0.5.1
mppx@0.5.10
mppx@0.5.11
mppx@0.5.12
mppx@0.5.13
mppx@0.5.14
mppx@0.5.16
mppx@0.5.17
mppx@0.5.3
mppx@0.5.4
mppx@0.5.5
mppx@0.5.6
mppx@0.5.7
mppx@0.5.8
mppx@0.5.9
mppx@0.6.0
mppx@0.6.1
mppx@0.6.10
mppx@0.6.11
mppx@0.6.12
mppx@0.6.13
mppx@0.6.14
mppx@0.6.15
mppx@0.6.16
mppx@0.6.17
mppx@0.6.18
mppx@0.6.19
mppx@0.6.2
mppx@0.6.20
mppx@0.6.21
mppx@0.6.22
mppx@0.6.23
mppx@0.6.24
mppx@0.6.25
mppx@0.6.26
mppx@0.6.27
mppx@0.6.28
mppx@0.6.29
mppx@0.6.3
mppx@0.6.30
mppx@0.6.31
mppx@0.6.5
mppx@0.6.6
mppx@0.6.7
mppx@0.6.8
mppx@0.6.9
mppx@0.7.0
mppx@0.8.0
mppx@0.8.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63628.json"