https://feed.craftedsignal.io/products/vyper-0.4.0b1-through-0.5.0b1/Trending threats, MITRE ATT&CK coverage, and detection metadata. Fed continuously.Hugoenhello@craftedsignal.iohello@craftedsignal.ioThu, 22 Oct 2026 03:53:10 +0000https://feed.craftedsignal.io/favicon-32x32.pnghttps://feed.craftedsignal.io/3232https://feed.craftedsignal.io/favicon.svghttps://feed.craftedsignal.io/briefs/2026-10-vyper-compiler-vulnerability/Thu, 22 Oct 2026 03:53:10 +0000hello@craftedsignal.iohttps://feed.craftedsignal.io/briefs/2026-10-vyper-compiler-vulnerability/Vyper versions 0.4.0b1 through 0.5.0b1 miscompile unfoldable constants and omitted default arguments from imported modules, potentially allowing attacker-influenced input to corrupt validation or accounting logic.<p>Vyper versions 0.4.0b1 through 0.5.0b1 contain a compiler flaw where unfoldable constants and omitted default arguments from imported modules are resolved in the function's scope rather than at declaration. This occurs because 'parse_Name' incorrectly resolves these names. When a contract parameter, local, or loop variable shares a name with such an imported constant or default argument, attacker-influenced input can replace the intended value. This may include out-of-range values for narrow types (e.g., uint8), resulting in corrupted validation or accounting logic. The CVSS v3.1 base score is 8.4.</p> highadvisory