VyperApplication · Vyperlang
CVE-2024-32649
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedVyper 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceThe Vyper compiler's `sqrt` builtin has a double evaluation vulnerability in its `build_IR` function. The argument is not cached to the stack, causing it to be evaluated multiple times instead of retrieving a cached value. This only manifests as a bug when the argument contains side-effects (e.g., function calls with state changes), leading to unexpected repeated execution.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
VyperApplication
< 0.4.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check Vyper compiler versionRun `vyper --version` or check your build system to identify the installed Vyper compiler versionAffected if Version is less than 0.4.0
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Identify contracts using the sqrt builtinSearch your Vyper contract source files for usage of the `sqrt()` functionAffected if Any contract uses the sqrt builtin function
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Inspect sqrt argument for side-effectsReview each sqrt() call and examine whether its argument contains function calls, state variable access, or other expressions that could have side-effectsAffected if The argument to sqrt() contains function calls or expressions that modify state
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Verify build_IR pipeline is in useConfirm that contracts are compiled using the `build_IR` output mode (the `vyper --ir` flag or equivalent in your build system)Affected if The build_IR compilation path is being used to compile contracts containing sqrt with side-effect arguments
You are affected if you use a Vyper compiler version below 0.4.0 AND compile contracts using the sqrt builtin with arguments containing side-effects via the build_IR pipeline.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor data0.4.0
Avoid using the `sqrt` builtin with expressions containing side-effects until a patched version is released. Review existing contracts for use of `sqrt` with complex arguments. No compiler fix is currently available.
Fix this in Vyper
Scoped from the published advisory
- Consultation4.0 h
- Implementation16.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $8,960.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-32649 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2024-32649 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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