CVE-2023-30629

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`.

• CWE-670

• https://docs.vyperlang.org/en/v0.3.7/built-in-functions.html#raw_callProduct
• https://github.com/lidofinance/gate-seals/blob/051593e74df01a4131c485b4fda52e691cd4b7d8/contracts/GateSeal.vy#L164Product
• https://github.com/lidofinance/gate-seals/pull/5/filesPatch
• https://github.com/vyperlang/vyper/commit/851f7a1b3aa2a36fd041e3d0ed38f9355a58c8aePatch
• https://github.com/vyperlang/vyper/security/advisories/GHSA-w9g2-3w7p-72g9Exploit, Vendor Advisory
• https://docs.vyperlang.org/en/v0.3.7/built-in-functions.html#raw_callProduct
• https://github.com/lidofinance/gate-seals/blob/051593e74df01a4131c485b4fda52e691cd4b7d8/contracts/GateSeal.vy#L164Product
• https://github.com/lidofinance/gate-seals/pull/5/filesPatch
• https://github.com/vyperlang/vyper/commit/851f7a1b3aa2a36fd041e3d0ed38f9355a58c8aePatch
• https://github.com/vyperlang/vyper/security/advisories/GHSA-w9g2-3w7p-72g9Exploit, Vendor Advisory

Published

Apr 24, 2023

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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