Bug 2565614

Summary: CVE-2020-37287 vyper: vyper: Data corruption via complex type function arguments [fedora-all]
Product: [Fedora] Fedora Reporter: TEJ RATHI <trathi>
Component: vyperAssignee: Peter Lemenkov <lemenkov>
Status: CLOSED CURRENTRELEASE QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: lemenkov
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["4ced4a44-e3c9-496d-8244-fabb4de24a25"]}
Fixed In Version: vyper-0.2.6 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-11-03 07:42:44 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2557978    

Description TEJ RATHI 2026-11-03 07:37:58 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

Vyper before 0.2.6 contains a call stack corruption vulnerability that causes incorrect function outputs when complex types with non-base members are passed as arguments. Contracts passing multi-dimensional arrays or structs to internal or external functions receive corrupted values because the compiler assumed each subtype size is 32.
Comment 1 Peter Lemenkov 2026-11-03 07:42:44 UTC 
This was fixed upstream in vyper 0.2.6 (GHSA-4v7v-gqf9-ww2g / VVE-2020-0003, published 2020-10-10).

All Fedora releases ship vyper 0.4.3, which already contains the fix and is not affected.