CVE-2025-27104 double eval in For List Iter in Vyper

vyper is a Pythonic Smart Contract Language for the EVM. Multiple evaluation of a single expression is possible in the iterator target of a for loop. While the iterator expression cannot produce multiple writes, it can consume side effects produced in the loop body e.g. read a storage variable...

CVE-2025-27104 double eval in For List Iter in Vyper

vyper is a Pythonic Smart Contract Language for the EVM. Multiple evaluation of a single expression is possible in the iterator target of a for loop. While the iterator expression cannot produce multiple writes, it can consume side effects produced in the loop body e.g. read a storage variable...

CVE-2025-27105 AugAssign evaluation order causing OOB write within the object in Vyper

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...

CVE-2025-27105 AugAssign evaluation order causing OOB write within the object in Vyper

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...

CVE-2025-27105

CVE-2025-27105 concerns vyper, a Pythonic smart contract language for the EVM. The issue arises in AugAssign handling when the target is an access to a dynamic array (DynArray); if the right-hand side modifies the array, the target is cached and the bounds check may not be re-evaluated during the...

CVE-2025-27105 AugAssign evaluation order causing OOB write within the object in Vyper

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...

Vyper 安全漏洞

Vyper is a Pythonic smart contract language for EVM open sourced by vyperlang. A security vulnerability exists in Vyper that stems from improper boundary checking for dynamic array operations...

PT-2025-7630 · Vyper · Vyper

Name of the Vulnerable Software and Affected Versions: Vyper versions prior to 0.4.1 Description: The issue concerns the potential for multiple evaluations of a single expression in the iterator target of a for loop, which can lead to unexpected program behavior. Specifically, reads in iterators...

Vyper 安全漏洞

Vyper is a Pythonic smart contract language for EVM open sourced by vyperlang. A security vulnerability exists in Vyper that stems from multiple evaluations of an iterator expression, which could lead to abnormal program behavior...

Vyper 安全漏洞

Vyper is a Pythonic smart contract language for EVM open sourced by vyperlang. A security vulnerability exists in Vyper that stems from mishandling of the sqrt function, which could lead to incorrect calculation results...

PT-2025-7605 · Vyper · Vyper

Name of the Vulnerable Software and Affected Versions: Vyper versions prior to 0.4.1 Description: The issue arises from the improper handling of oscillating final states in the sqrt function, which uses the babylonian method to calculate square roots of decimals. This can lead to sqrt incorrectly...

CVE-2022-29255

Vyper is a Pythonic Smart Contract Language for the ethereum virtual machine. In versions prior to 0.3.4 when a calling an external contract with no return value, the contract address including side effects could be evaluated twice. This may result in incorrect outcomes for contracts. This issue...

CVE-2022-24788

Vyper is a pythonic Smart Contract Language for the ethereum virtual machine. Versions of vyper prior to 0.3.2 suffer from a potential buffer overrun. Importing a function from a JSON interface which returns bytes generates bytecode which does not clamp bytes length, potentially resulting in a...

CVE-2022-24845

Vyper is a pythonic Smart Contract Language for the ethereum virtual machine. In affected versions, the return of .returnsint128 is not validated to fall within the bounds of int128. This issue can result in a misinterpretation of the integer value and lead to incorrect behavior. As of v0.3.0,...

CVE-2022-24787

Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine. In version 0.3.1 and prior, bytestrings can have dirty bytes in them, resulting in the word-for-word comparisons giving incorrect results. Even without dirty nonzero bytes, two bytestrings can compare to equal if one en...

CVE-2024-43366

zkvyper is a Vyper compiler. Starting in version 1.3.12 and prior to version 1.5.3, since LLL IR has no Turing-incompletness restrictions, it is compiled to a loop with a much more late exit condition. It leads to a loss of funds or other unwanted behavior if the loop body contains it. However,...

CVE-2024-24561

Vyper is a pythonic Smart Contract Language for the ethereum virtual machine. In versions 0.3.10 and earlier, the bounds check for slices does not account for the ability for start + length to overflow when the values aren't literals. If a slice function uses a non-literal argument for the start ...

CVE-2024-24563

Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine. Arrays can be keyed by a signed integer, while they are defined for unsigned integers only. The typechecker doesn't throw when spotting the usage of an int as an index for an array. The typechecker allows the usage of...

CVE-2024-22419

Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine. The concat built-in can write over the bounds of the memory buffer that was allocated for it and thus overwrite existing valid data. The root cause is that the buildIR for concat doesn't properly adhere to the API of co...

Gas Manipulation Attack

vyper is vulnerable to Gas Manipulation Attack. The vulnerability is due to insufficient error handling in the Vyper Compiler, which fails to check the success flag of precompile calls EcRecover and Identity, allowing attackers to manipulate the gas, causing precompile failures without halting...