CVE-2024-32481 — Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine

Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. Starting in version 0.3.8 and prior to version 0.4.0b1, when looping over a `range` of the form `range(start, start + N)`, if `start` is negative, the execution will always revert. This issue is caused

01What is this vulnerability?

Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. Starting in version 0.3.8 and prior to version 0.4.0b1, when looping over a `range` of the form `range(start, start + N)`, if `start` is negative, the execution will always revert. This issue is caused by an incorrect assertion inserted by the code generation of the range `stmt.parse_For_range()`. The issue arises when…

02Affected products

Vendor	Product	Versions
vyperlang	vyper	>= 0.3.8, < 0.4.0b1

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

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

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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: 2024-04-25T17:00:54.082Z
• Last modified: 2024-08-02T02:13:39.300Z

09References

• github.com — https://github.com/vyperlang/vyper/security/advisories/GHSA-ppx5-q359-pvwj
• github.com — https://github.com/vyperlang/vyper/commit/3de1415ee77a9244eb04bdb695e249d3ec9ed8…
• github.com — https://github.com/vyperlang/vyper/commit/5319cfbe14951e007ccdb323257e5ada869b35…
• github.com — https://github.com/vyperlang/vyper/blob/9136169468f317a53b4e7448389aa315f90b95ba…