CVE-2023-30629 — Vyper is a Pythonic Smart Contract Language for the ethereum virtual machine

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 fro

01What is this vulnerability?

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…

02Affected products

Vendor	Product	Versions
vyperlang	vyper	>= 0.3.1, <= 0.3.7

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-04-24T21:58:00.227Z
• Last modified: 2025-02-12T16:35:42.775Z

09References

• github.com — https://github.com/vyperlang/vyper/security/advisories/GHSA-w9g2-3w7p-72g9
• github.com — https://github.com/lidofinance/gate-seals/pull/5/files
• github.com — https://github.com/vyperlang/vyper/commit/851f7a1b3aa2a36fd041e3d0ed38f9355a58c8…
• docs.vyperlang.org — https://docs.vyperlang.org/en/v0.3.7/built-in-functions.html#raw_call
• github.com — https://github.com/lidofinance/gate-seals/blob/051593e74df01a4131c485b4fda52e691…