CVE-2024-26149: Vyper _abi_decode Memory Overflow

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-02-26 · updated 2026-06-17
Weakness: CWE-119

Description

Vyper is a pythonic Smart Contract Language for the ethereum virtual machine. If an excessively large value is specified as the starting index for an array in `_abi_decode`, it can cause the read position to overflow. This results in the decoding of values outside the intended array bounds, potentially leading to exploitations in contracts that use arrays within `_abi_decode`. This vulnerability affects 0.3.10 and earlier versions.

Affected products

vyperlang vyper: through 0.3.10

References

https://github.com/vyperlang/vyper/security/advisories/GHSA-9p8r-4xp4-gw5w
https://github.com/vyperlang/vyper/security/advisories/GHSA-9p8r-4xp4-gw5w

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