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Medium, CVSS 5.3

Transaction validity oversight in pallet-ethereum

CVE-2021-39193GHSA-hw4v-5x4h-c3xm

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • crates.io pallet-ethereum

    Affected
    <= 3.0.0
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS
  • CVE-2021-39193: 1.19% estimated exploitation activity in the next 30 days; percentile 67.97 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Impact A bug in pallet-ethereum can cause invalid transactions to be included in the Ethereum block state in pallet-ethereum due to not validating the input data size. Any invalid transactions included this way have no possibility to alter the internal Ethereum or Substrate state. The transaction will appear to have be included, but is of no effect as it is rejected by the EVM engine. The impact is further limited by Substrate extrinsic size constraints. Patches Patches are applied in PR #465. Workarounds None. References Patch PR: https://github.com/paritytech/frontier/pull/465 For more information If you have any questions or comments about this advisory: Open an issue in the Frontier repo

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-hw4v-5x4h-c3xm

Agent brief

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# Patch Next advisory brief: CVE-2021-39193

Advisory: Transaction validity oversight in pallet-ethereum
IDs: CVE-2021-39193, GHSA-hw4v-5x4h-c3xm
Record: https://patchnext.com/advisories/cve-2021-39193 (revision 1, source checked 26 Oct 2026, 15:38 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- crates.io pallet-ethereum: affected <= 3.0.0

## Suggested inspection (read-only)
- crates.io pallet-ethereum: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on pallet-ethereum.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-hw4v-5x4h-c3xm (GitHub-reviewed advisory GHSA-hw4v-5x4h-c3xm lists affected ranges: crates.io pallet-ethereum >=0 <=3.0.0)

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