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TI-2024-21531 Aliases CVE-2024-32649GHSA-5jrj-52x8-m64h

vyper performs double eval of the argument of sqrt

Priority MEDIUM 63CWE-95Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-95.

Summary

Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. In versions 0.3.10 and prior, using the `sqrt` builtin can result in double eval vulnerability when the argument has side-effects. It can be seen that the `build_IR` function of the `sqrt` builtin doesn't cache the argument to the stack. As such, it can be evaluated multiple times (instead of retrieving the value from the stack). No vulnerable production contracts were found. Additionally, double evaluation of side-effects should be easily discoverable in client tests. As such, the impact is low. As of time of publication, no fixed versions are available.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00451 39th percentileScored 2026-11-07
Fix Fixed vyper (PyPI): 0.4.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
vyperlangvyperup to 0.3.10—No fix listedCNA
—vyper (PyPI)before 0.4.00.4.0Patch availableGHSA-5jrj-52x8-m64h
  • vyper Vendorvyperlang Affected up to 0.3.10 Fixed in — No fix listed CNA
  • vyper (PyPI) Vendor— Affected before 0.4.0 Fixed in 0.4.0 Patch available GHSA-5jrj-52x8-m64h

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:vyperlang:vyper:*:*:*:*:*:python:*:*before 0.4.0Vulnerablevyperlang
  • cpe:2.3:a:vyperlang:vyper:*:*:*:*:*:python:*:* Versions before 0.4.0 Vulnerable ·vyperlang

Remediation

  • Fix · GHSA-5jrj-52x8-m64h vyper (PyPI) Fixed in 0.4.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2024-32649
  2. 2026-10-03 Alias added: GHSA-5jrj-52x8-m64h

References

Advisory 2

Other 3

  • TI-2024-16182 Vyper bounds check on built-in `slice()` function can be overflowed CVSS 3.1CRITICAL 9.8
  • TI-2024-14992 concat built-in can corrupt memory in vyper CVSS 3.1CRITICAL 9.8
  • TI-2024-16184 Vyper array negative index vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2022-08657 Integer bounds error in Vyper CVSS 3.1CRITICAL 9.8
  • TI-2022-11796 Multiple evaluation of contract address in call in vyper CVSS 3.1HIGH 8.2
  • TI-2024-21527 vyper performs incorrect topic logging in raw_log CVSS 3.1MEDIUM 5.3
See all 37 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences