Description
Vyper is the Pythonic Programming Language for the Ethereum Virtual Machine. In versions up to and including 0.4.2rc1, the `slice()` builtin can elide side effects when the output length is 0, and the source bytestring is a builtin (`msg.data` or `<address>.code`). The reason is that for these source locations, the check that `length >= 1` is skipped. The result is that a 0-length bytestring constructed with slice can be passed to `make_byte_array_copier`, which elides evaluation of its source argument when the max length is 0. The impact is that side effects in the `start` argument may be elided when the `length` argument is 0, e.g. `slice(msg.data, self.do_side_effect(), 0)`. The fix in pull request 4645 disallows any invocation of `slice()` with length 0, including for the ad hoc locations discussed in this advisory. The fix is expected to be part of version 0.4.2.
INFO
Published Date :
2025-05-15T17:38:58.487Z
Last Modified :
2025-05-15T18:33:29.976Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2025-47774 vulnerability.
| Vendors | Products |
|---|---|
| Vyperlang |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2025-47774.
