Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applicationsUpgrade vyper
to version 0.4.0 or higher.
vyper is a Pythonic Smart Contract Language for the EVM.
Affected versions of this package are vulnerable to Classic Buffer Overflow via the concat
built-in function. An attacker can alter the contract's intended behavior, that may overwrite valid data, leading to unexpected outcomes.
@internal
def bar() -> uint256:
sss: String[2] = concat("a", "b")
return 1
@external
def foo() -> int256:
a: int256 = -1
b: uint256 = self.bar()
return a
@external
def __init__():
i = -1
s: String[2] = concat("a", "b")
@external
def foo() -> int256:
return i