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Vulnerability · Published Feb 29, 2024 · Assigned by GitHub_M

CVE-2024-27094OpenZeppelin Contracts base64 encoding may read from potentially dirty memory

Medium 6.5

In plain English

A medium-severity out-of-bounds read in openzeppelin-contracts from OpenZeppelin. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.8%top 44.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

OpenZeppelin Contracts is a library for secure smart contract development. The `Base64.encode` function encodes a `bytes` input by iterating over it in chunks of 3 bytes. When this input is not a multiple of 3, the last iteration may read parts of the memory that are beyond the input buffer. The vulnerability is fixed in 5.0.2 and 4.9.6.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npm@openzeppelin/contracts4.9.6GHSA-9vx6-7xxf-x967
npm@openzeppelin/contracts5.0.2GHSA-9vx6-7xxf-x967
npm@openzeppelin/contracts-upgradeable5.0.2GHSA-9vx6-7xxf-x967
npm@openzeppelin/contracts-upgradeable4.9.6GHSA-9vx6-7xxf-x967

Affected products (as reported)

VendorProductVersions
OpenZeppelin openzeppelin-contracts >= 4.5.0, < 4.9.6>= 5.0.0-rc.0, < 5.0.2

Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

References