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TI-2023-14445 Aliases CVE-2023-30629GHSA-w9g2-3w7p-72g9

Vyper's raw_call with outsize=0 and revert_on_failure=False returns incorrect success value

Priority MEDIUM 41CWE-670Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

Vyper is a Pythonic Smart Contract Language for the ethereum virtual machine. In versions 0.3.1 through 0.3.7, the Vyper compiler generates the wrong bytecode. Any contract that uses the `raw_call` with `revert_on_failure=False` and `max_outsize=0` receives the wrong response from `raw_call`. Depending on the memory garbage, the result can be either `True` or `False`. A patch is available and, as of time of publication, anticipated to be part of Vyper 0.3.8. As a workaround, one may always put `max_outsize>0`.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00883 59th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed vyper (PyPI): 0.3.8

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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
vyperlangvyper0.3.1 – 0.3.7—No fix listedCNA
—vyper (PyPI)0.3.1 to before 0.3.80.3.8Patch availableGHSA-w9g2-3w7p-72g9
  • vyper Vendorvyperlang Affected 0.3.1 – 0.3.7 Fixed in — No fix listed CNA
  • vyper (PyPI) Vendor— Affected 0.3.1 to before 0.3.8 Fixed in 0.3.8 Patch available GHSA-w9g2-3w7p-72g9

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:vyperlang:vyper:*:*:*:*:*:*:*:*0.3.1 to before 0.3.8Vulnerablevyperlang
  • cpe:2.3:a:vyperlang:vyper:*:*:*:*:*:*:*:* Versions 0.3.1 to before 0.3.8 Vulnerable ·vyperlang

Remediation

  • Fix · GHSA-w9g2-3w7p-72g9 vyper (PyPI) Fixed in 0.3.8 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-30629
  2. 2026-10-03 Alias added: GHSA-w9g2-3w7p-72g9

References

Exploit 1

Patch 2

Advisory 1

Other 4

  • 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-2024-21531 vyper performs double eval of the argument of sqrt 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