CVE-2023-42460

Public Exploit
_abi_decode input not validated in complex expressions in Vyper

Description

Vyper is a Pythonic Smart Contract Language for the EVM. The `_abi_decode()` function does not validate input when it is nested in an expression. Uses of `_abi_decode()` can be constructed which allow for bounds checking to be bypassed resulting in incorrect results. This issue has not yet been fixed, but a fix is expected in release `0.3.10`. Users are advised to reference pull request #3626.

Category

5.3
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.05%
Third-Party Advisory github.com
Affected: vyperlang vyper
Published at:
Updated at:

References

Link Tags
https://github.com/vyperlang/vyper/security/advisories/GHSA-cx2q-hfxr-rj97 patch third party advisory exploit
https://github.com/vyperlang/vyper/pull/3626 patch

Frequently Asked Questions

What is the severity of CVE-2023-42460?
CVE-2023-42460 has been scored as a medium severity vulnerability.
How to fix CVE-2023-42460?
To fix CVE-2023-42460, 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-2023-42460 being actively exploited in the wild?
It is possible that CVE-2023-42460 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-2023-42460?
CVE-2023-42460 affects vyperlang vyper.
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