PYSEC-2026-2028 Vyper's `slice()` may elide side-effects when output length is 0

Impact 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:...

CVE-2025-47774

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...