---
id: CVE-2021-29511
aliases:
  - GHSA-4jwq-572w-4388
title: Memory over-allocation in evm crate
summary: Memory over-allocation in evm crate
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
vendor: evm
product: evm
ecosystem: rust
affected:
  - evm < 0.21.1
  - evm-core < 0.21.1
  - 'evm >= 0.22.0, < 0.22.1'
  - 'evm >= 0.23.0, < 0.23.1'
  - 'evm >= 0.24.0, < 0.24.1'
  - 'evm >= 0.25.0, < 0.25.1'
  - 'evm >= 0.26.0, < 0.26.1'
  - 'evm-core >= 0.22.0, < 0.22.1'
  - 'evm-core >= 0.23.0, < 0.23.1'
  - 'evm-core >= 0.24.0, < 0.24.1'
  - 'evm-core >= 0.25.0, < 0.25.1'
  - 'evm-core >= 0.26.0, < 0.26.1'
patched:
  - evm 0.21.1
  - evm-core 0.21.1
  - evm 0.22.1
  - evm 0.23.1
  - evm 0.24.1
  - evm 0.25.1
  - evm 0.26.1
  - evm-core 0.22.1
  - evm-core 0.23.1
  - evm-core 0.24.1
  - evm-core 0.25.1
  - evm-core 0.26.1
published: '2024-01-30'
updated: '2026-07-08'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-4jwq-572w-4388'
references:
  - url: >-
      https://github.com/rust-blockchain/evm/security/advisories/GHSA-4jwq-572w-4388
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2021-29511'
  - url: >-
      https://github.com/rust-blockchain/evm/commit/19ade858c430ab13eb562764a870ac9f8506f8dd
tags:
  - osv
  - rust
epss: 0.0128
epssPercentile: 0.68789
ingestedAt: '2026-07-09T18:56:37.272Z'
---

## Overview

### Impact
Prior to the patch, when executing specific EVM opcodes related to memory operations that use `evm_core::Memory::copy_large`, the crate can over-allocate memory when it is not needed, making it possible for an attacker to perform denial-of-service attack.

### Patches
The flaw was corrected in commit `19ade85`. Users should upgrade to `==0.21.1, ==0.23.1, ==0.24.1, ==0.25.1, >=0.26.1`.

### Workarounds
None. Please upgrade your `evm` crate version

### References
Fix commit: https://github.com/rust-blockchain/evm/commit/19ade858c430ab13eb562764a870ac9f8506f8dd

### For more information
If you have any questions or comments about this advisory:
* Open an issue in [evm repo](https://github.com/rust-blockchain/evm)
* Email [Wei](mailto:wei@that.world)


## Affected packages

- `evm < 0.21.1`
- `evm-core < 0.21.1`
- `evm >= 0.22.0, < 0.22.1`
- `evm >= 0.23.0, < 0.23.1`
- `evm >= 0.24.0, < 0.24.1`
- `evm >= 0.25.0, < 0.25.1`
- `evm >= 0.26.0, < 0.26.1`
- `evm-core >= 0.22.0, < 0.22.1`
- `evm-core >= 0.23.0, < 0.23.1`
- `evm-core >= 0.24.0, < 0.24.1`
- `evm-core >= 0.25.0, < 0.25.1`
- `evm-core >= 0.26.0, < 0.26.1`

## Remediation

Upgrade to a patched release:

- `evm 0.21.1`
- `evm-core 0.21.1`
- `evm 0.22.1`
- `evm 0.23.1`
- `evm 0.24.1`
- `evm 0.25.1`
- `evm 0.26.1`
- `evm-core 0.22.1`
- `evm-core 0.23.1`
- `evm-core 0.24.1`
- `evm-core 0.25.1`
- `evm-core 0.26.1`