GHSA-2r3x-4mrv-mcxf: Out-of-bounds Read

Published Oct 6, 2026
·
Updated

Impact When performing a function call inside a tuple or as an argument inside another function call, there is a memory corruption issue that occurs because of an incorrect pointer to the the tip of the stack.

Example code: python @internal def foo(a: uint256, b: uint256, c: uint256) -> (uint256, uint256, uint256, uint256, uint256): return 1, a, b, c, 5

@internal def foo2() -> uint256: a: uint256[10] = [6,7,8,9,10,11,12,13,15,16] return 4

@external def foo() -> (uint256, uint256, uint256, uint256, uint256): return self.foo(2, 3, self.foo2())

Please see #2186 for further information

Patches This problem was fixed in #2186, and released as a part of v0.2.6.

Affected Software

1 affected componentFixes available
pip/vyper<0.2.6
0.2.6

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade pip/vyper to a version that resolves this vulnerability.

    Fixed in 0.2.6
  2. Upgrade

    Upgrade Vyper to a version that resolves this vulnerability.

    Fixed in 0.2.6

Event History

Oct 6, 2026
Advisory Published
via GitHub·03:22 PM
Data Sourced
via GitHub·03:22 PM
DescriptionWeaknessAffected Software

Frequently Asked Questions

1

Which release includes the fix?

The fix was released in Vyper v0.2.6 as part of pull request #2186.

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