CVE-2025-47774 - Vyper Uninitialized Side Effect Elision in Slice Builtin

CVE-2025-47774 - Vyper Uninitialized Side Effect Elision in Slice Builtin

https://cvefeed.io/rssfeed/latest.atom / Thu, 05/15/2025 - 20:40
CVE ID : CVE-2025-47774
Published : May 15, 2025, 6:15 p.m. | 24 minutes ago
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 `
.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.
Severity: 0.0 | NA
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