CVE-2023-23940 json
OpenZeppelin Contracts for Cairo is vulnerable to signature validation bypass
published 2023-02-02 3 y ago modified 2026-06-17 4 mo ago also GHSA-626q-v9j4-mcp4 , PYSEC-2023-39 , EUVD-2023-0188
- cvss
- 6.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 12%
- public exploits
- 0
- none known
Summary
OpenZeppelin Contracts for Cairo is a library for secure smart contract development written in Cairo for StarkNet, a decentralized ZK Rollup. `is_valid_eth_signature` is missing a call to `finalize_keccak` after calling `verify_eth_signature`. As a result, any contract using `is_valid_eth_signature` from the account library (such as the `EthAccount` preset) is vulnerable to a malicious sequencer. Specifically, the malicious sequencer would be able to bypass signature validation to impersonate an instance of these accounts. The issue has been patched in 0.6.1.
Patch / fix
- pypi openzeppelin-cairo-contracts 0.6.1
- openzeppelin contracts 0.6.1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 19 mo ago
Exploit prediction
0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.4 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L |
| NVD | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N |
| GitHub | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | openzeppelin-cairo-contracts | >=0.2.0, <0.6.1 |
0.6.1 |
Affected products
- OpenZeppelin cairo-contracts
Classification
References
-
github.com
/OpenZeppelin/cairo-contracts/pull/542/commits/6d4cb750478fca2fd916f73297632f899aca9299
web, patch, third-party-advisory
-
github.com
/OpenZeppelin/cairo-contracts/security/advisories/GHSA-626q-v9j4-mcp4
web, third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2023-23940
advisory
-
github.com
/OpenZeppelin/cairo-contracts
package
-
github.com
/pypa/advisory-database/tree/main/vulns/openzeppelin-cairo-contracts/PYSEC-2023-39.yaml
web
Sources
- CVE List CVE-2023-23940
- GitHub Advisory GHSA-626q-v9j4-mcp4
- NVD CVE-2023-23940
- OSV PYSEC-2023-39
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