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CVE-2023-34234

18
FAUCET Score

CVE-2023-34234 affects OpenZeppelin Contracts, specifically the Governor and GovernorCompatibilityBravo contracts, allowing an attacker to frontrun proposal creation and repeatedly cancel them, effectively preventing legitimate proposals. This vulnerability has a CVSS score of 5.3 (Medium), indicating a network-based attack with low complexity that can lead to a denial of availability for proposals. While no active exploitation, public exploit code, or significant community discussion has been observed, users are strongly advised to upgrade to version 4.9.1 or utilize frontrunning-protected transaction submission as a workaround.

Impacted Technologies

VendorProductVersion(s)CPE
>= 4.3.0, < 4.9.1CPE matchmatch criteria
cpe:2.3:a:openzeppelin:contracts:*:*:*:*:*:node.js:*:*
>= 4.3.0, < 4.9.1CPE matchmatch criteria
cpe:2.3:a:openzeppelin:contracts_upgradeable:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.60%
Probability of exploitation in next 30 days
EPSS Percentile
44.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0060 is in the 29th percentile among its peer group of 23,723 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: @openzeppelin/contractsFixed in: 4.9.1
npmpatch availablevia ghsa
Product: @openzeppelin/contracts-upgradeableFixed in: 4.9.1

Vendor Advisories (1)

npmGHSA-5h3x-9wvq-w4m2medium

OpenZeppelin Contracts's governor proposal creation may be blocked by frontrunning

Jun 8, 2023

References

github.com / OpenZeppelin/openzeppelin-contracts/commit/d9474327a492f9f310f31bc53f38dbea56ed9a57
Patch
github.com / OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-5h3x-9wvq-w4m2
Vendor Advisory