Vulnerability Description
vyper is a Pythonic Smart Contract Language for the EVM. Vyper handles AugAssign statements by first caching the target location to avoid double evaluation. However, in the case when target is an access to a DynArray and the rhs modifies the array, the cached target will evaluate first, and the bounds check will not be re-evaluated during the write portion of the statement. This issue has been addressed in version 0.4.1 and all users are advised to upgrade. There are no known workarounds for this vulnerability.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Vyperlang | Vyper | < 0.4.1 |
Related Weaknesses (CWE)
References
- https://github.com/vyperlang/vyper/security/advisories/GHSA-4w26-8p97-f4jpExploitVendor Advisory
FAQ
What is CVE-2025-27105?
CVE-2025-27105 is a vulnerability with a CVSS score of 9.1 (CRITICAL). vyper is a Pythonic Smart Contract Language for the EVM. Vyper handles AugAssign statements by first caching the target location to avoid double evaluation. However, in the case when target is an acce...
How severe is CVE-2025-27105?
CVE-2025-27105 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2025-27105?
Check the references section above for vendor advisories and patch information. Affected products include: Vyperlang Vyper.