CVE-2025-27105

Public Exploit
AugAssign evaluation order causing OOB write within the object in Vyper

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.

Category

2.3
CVSS
Severity: Low
CVSS 4.0 •
CVSS 3.1 •
EPSS 0.08%
Vendor Advisory github.com
Affected: vyperlang vyper
Published at:
Updated at:

References

Link Tags
https://github.com/vyperlang/vyper/security/advisories/GHSA-4w26-8p97-f4jp vendor advisory exploit

Frequently Asked Questions

What is the severity of CVE-2025-27105?
CVE-2025-27105 has been scored as a low severity vulnerability.
How to fix CVE-2025-27105?
To fix CVE-2025-27105, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-27105 being actively exploited in the wild?
It is possible that CVE-2025-27105 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-27105?
CVE-2025-27105 affects vyperlang vyper.
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