CVE-2026-63627

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Source
https://cve.org/CVERecord?id=CVE-2026-63627
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63627.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-63627
Aliases
Published
2026-09-22T19:07:02Z
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 padding
Details

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.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-20"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63627.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-2026-63627.json"