GHSA-vj8p-hp9x-gh47: Mpp Mpp Vulnerable To Gas Draining Vulnerability

HIGH
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CWE-20
Published
Advisory Summary

GHSA-vj8p-hp9x-gh47 is a HIGH mpp vulnerable to gas draining vulnerability (CWE-20: Improper Input Validation) affecting Mpp libraries in the Hex ecosystem. The issue involves mpp vulnerable to gas draining with low gas limit. Remediation is available by upgrading affected packages to version 0.6.0.

GHSA-vj8p-hp9x-gh47 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-vj8p-hp9x-gh47
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-20: Improper Input Validation
Affected Product Mpp
Package Ecosystem Hex
Published Date
Last Updated

How to Fix GHSA-vj8p-hp9x-gh47

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

mpp fixed: 0.6.0 
Upgrade mpp to 0.6.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for mpp

How to Check if You Are Affected

To determine whether your application is affected by GHSA-vj8p-hp9x-gh47, inspect your project dependencies for Mpp:

inspect dependencies for mpp

Analyze the terminal output to locate any version of Mpp in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.6.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Mpp, 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

## Vulnerability When the server acts as the fee payer, `mpp` Elixir 0.4.0 (ZenHive/mpp) does not validate whether the `gas_limit` set by the client is enough before broadcasting. A malicious client can drain the server's gas without paying. A `transferWithMemo` call on Tempo Moderato testnet requires **~51,299 gas** to complete successfully. By setting `gas_limit = 51,298`: 1. The Tx gets cosigned and broadcast by the server. 2. The Tx runs out of gas during EVM execution. All state reverts. 3. The server's fee-payer wallet is charged for gas used. 4. The client pays nothing and receives no resource. ```bash # Run the PoC unzip mpp_elixir_low_gas_PoC.zip cd mpp_elixir_low_gas_PoC docker build -t mpp-elixir-low-gas . docker run --rm mpp-elixir-low-gas ``` **Zero-Cost DoS Attack:** Unlike gas draining with `access list` or `padding`, where the malicious client needs to complete a payment to drain the gas, this vulnerability allows malicious users to continuously drain the server's gas at virtually no financial cost (requiring only computing power). Therefore, an attacker can spawn *N* malicious clients to completely drain the funds from the server's wallet to perform a Denial of Service (DoS) attack. Once the server's wallet is empty, it has no more funds to pay the gas fees for upcoming requests from legitimate clients. ```bash # Run the DoS PoC unzip mpp_elixir_low_gas_dos_PoC.zip cd mpp_elixir_low_gas_dos_PoC docker build -t mpp-elixir-dos . docker run --rm mpp-elixir-dos ``` **Vulnerable code path:** `broadcast_and_verify/7` in `mpp/methods/tempo.ex` (ZenHive/mpp 0.4.0). When `wait_for_confirmation = true` (the default), it calls `rpc_broadcast_sync` directly without any gas-adequacy check or simulation. The alternative `wait_for_confirmation = false` path does call `simulate_payment_call` via `eth_call`, but that simulation omits the `gas` parameter and therefore does not catch out-of-gas conditions. ## Impact A malicious client can drain the server's wallet without any financial cost.

GHSA-vj8p-hp9x-gh47 Affected Mpp Versions

1 component(s)
Fixed Versions:
0.6.0
Product / Package Ecosystem Affected Versions Fixed Version
mpp
 Hex
≥ 0.2.0
< 0.6.0
0.6.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/ZenHive/mpp/security/advisories/GHSA-vj8p-hp9x-gh47
Security Fix Commit FIX COMMIT
https://github.com/ZenHive/mpp/commit/d84e3e528db39654540c2035ea0fbdf7b950d3d1
Mpp Source Repository REPOSITORY
https://github.com/ZenHive/mpp
Mpp Release RELEASE
https://github.com/ZenHive/mpp/releases/tag/v0.6.0

Frequently Asked Questions

What is GHSA-vj8p-hp9x-gh47?
GHSA-vj8p-hp9x-gh47 is a security vulnerability in Mpp involving mpp vulnerable to Gas Draining with low gas limit under CWE-20: Improper Input Validation.
Which Mpp versions are affected?
Affected versions include releases prior to 0.6.0 across affected packages: mpp.
What version fixes GHSA-vj8p-hp9x-gh47?
Upgrading to 0.6.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is mpp affected?
Yes, mpp is affected in releases prior to 0.6.0. Upgrade your dependency to 0.6.0 or later.
What CWE is associated with GHSA-vj8p-hp9x-gh47?
GHSA-vj8p-hp9x-gh47 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check Hex dependencies for GHSA-vj8p-hp9x-gh47?
Run the dependency tree command: 'inspect dependencies for mpp'. 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-vj8p-hp9x-gh47",
  "modified" : "2026-09-25T21:47:36Z",
  "published" : "2026-09-25T21:47:36Z",
  "aliases" : [ ],
  "summary" : "mpp vulnerable to Gas Draining with low gas limit",
  "details" : "## Vulnerability\nWhen the server acts as the fee payer, `mpp` Elixir 0.4.0 (ZenHive/mpp) does not validate whether the `gas_limit` set by the client is enough before broadcasting. A malicious client can drain the server's gas without paying.\n\nA `transferWithMemo` call on Tempo Moderato testnet requires **~51,299 gas** to complete successfully. By setting `gas_limit = 51,298`:\n\n1. The Tx gets cosigned and broadcast by the server.\n2. The Tx runs out of gas during EVM execution. All state reverts.\n3. The server's fee-payer wallet is charged for gas used.\n4. The client pays nothing and receives no resource.\n\n```bash\n# Run the PoC\nunzip mpp_elixir_low_gas_PoC.zip\ncd mpp_elixir_low_gas_PoC\ndocker build -t mpp-elixir-low-gas .\ndocker run --rm mpp-elixir-low-gas\n```\n\n**Zero-Cost DoS Attack:** Unlike gas draining with `access list` or `padding`, where the malicious client needs to complete a payment to drain the gas, this vulnerability allows malicious users to continuously drain the server's gas at virtually no financial cost (requiring only computing power). Therefore, an attacker can spawn *N* malicious clients to completely drain the funds from the server's wallet to perform a Denial of Service (DoS) attack. Once the server's wallet is empty, it has no more funds to pay the gas fees for upcoming requests from legitimate clients. \n\n```bash\n# Run the DoS PoC\nunzip mpp_elixir_low_gas_dos_PoC.zip\ncd mpp_elixir_low_gas_dos_PoC\ndocker build -t mpp-elixir-dos .\ndocker run --rm mpp-elixir-dos\n```\n\n**Vulnerable code path:** `broadcast_and_verify/7` in `mpp/methods/tempo.ex` (ZenHive/mpp 0.4.0).\nWhen `wait_for_confirmation = true` (the default), it calls `rpc_broadcast_sync` directly without any gas-adequacy check or simulation. The alternative `wait_for_confirmation = false` path does call `simulate_payment_call` via `eth_call`, but that simulation omits the `gas` parameter and therefore does not catch out-of-gas conditions.\n\n## Impact\nA malicious client can drain the server's wallet without any financial cost.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Hex",
      "name" : "mpp"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.2.0"
      }, {
        "fixed" : "0.6.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/ZenHive/mpp/security/advisories/GHSA-vj8p-hp9x-gh47"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ZenHive/mpp/commit/d84e3e528db39654540c2035ea0fbdf7b950d3d1"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/ZenHive/mpp"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ZenHive/mpp/releases/tag/v0.6.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-25T21:47:36Z",
    "nvd_published_at" : null
  }
}