Summary
Vyper: Call stack corruption when passing complex type containing non-base type members as argument
Please see #2183 for further information
Impact
When we pass a multi-dimensional array (like [[1, 2], [3, 4]]) as an argument to internal/external functions we get incorrect output. This is due to a stack management issue, because it was assumed that the size of each subtype of an array/struct is 32, which is not always correct.
Example code:
@internal
def test_input(arr: int128[2][1], i: int128) -> (int128[2][1], int128):
return arr, i
@external
def test_values(arr: int128[2][1], i: int128) -> (int128[2][1], int128):
return self.test_input(arr, i)
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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This problem was fixed in #2184, and released as a part of v0.2.6.
Frequently Asked Questions
- What is GHSA-4V7V-GQF9-WW2G? GHSA-4V7V-GQF9-WW2G is a medium-severity security vulnerability in vyper (pip), affecting versions < 0.2.6. It is fixed in 0.2.6.
- Which versions of vyper are affected by GHSA-4V7V-GQF9-WW2G? vyper (pip) versions < 0.2.6 is affected.
- Is there a fix for GHSA-4V7V-GQF9-WW2G? Yes. GHSA-4V7V-GQF9-WW2G is fixed in 0.2.6. Upgrade to this version or later.
- Is GHSA-4V7V-GQF9-WW2G exploitable, and should I be worried? Whether GHSA-4V7V-GQF9-WW2G is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether GHSA-4V7V-GQF9-WW2G is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix GHSA-4V7V-GQF9-WW2G? Upgrade
vyperto 0.2.6 or later.