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CVE-2021-41121

Memory corruption in Vyper

HIGH
8.8
CVSS Score
Published: October 6, 2021 at 05:10 PM UTC
Updated: June 17, 2026 at 04:07 AM UTC
1 product affected across 1 vendorVyper

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Severity
HIGH8.8
Exploit prediction
EPSS 1%

Description

Vyper is a Pythonic Smart Contract Language for the EVM. In affected versions when performing a function call inside a literal struct, there is a memory corruption issue that occurs because of an incorrect pointer to the the top of the stack. This issue has been resolved in version 0.3.0.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Vyper· Vyperlangpypi
95%
v < 0.3.0
Affected range stops below 0.3.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/vyperlang/vyper/pull/2447
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://github.com/vyperlang/vyper/security/advisories/GHSA-xv8x-pr4h-73jv

CVSS

8.8HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-119

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