CVE-2025-26622 sqrt doesn't define rounding behavior in Vyper
The Vyper compiler's sqrt function may return incorrectly rounded results, potentially affecting smart contract logic accuracy.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-26622?
CVE-2025-26622 is a low-severity vulnerability in vyperlang vyper, published on 21 Feb 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
vyper is a Pythonic Smart Contract Language for the EVM. Vyper `sqrt()` builtin uses the babylonian method to calculate square roots of decimals. Unfortunately, improper handling of the oscillating final states may lead to sqrt incorrectly returning rounded up results. This issue is being addressed and a fix is expected in version 0.4.1. Users are advised to upgrade as soon as the patched release is available. There are no known workarounds for this vulnerability.
Weakness: CWE-682
Which versions are affected by CVE-2025-26622?
3 open source packages ship an affected version, including vyper. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
vyper PyPI | All versions | 0.4.1 |
vyper PyPI | All versions | 0.4.1 |
vyper PyPI | All versions | 0.4.1 |
Products include Vyperlang Vyper.
How do I fix CVE-2025-26622?
Upgrade vyper to 0.4.1 or later.
Is CVE-2025-26622 being exploited?
There is no known exploitation of CVE-2025-26622 in the wild and no public exploit code.
Other vulnerabilities in vyperlang vyper
- CVE-2024-24563 Vyper array negative index vulnerability
- CVE-2024-24561 Vyper bounds check on built-in `slice()` function can be overflowed
- CVE-2023-39363 Vyper incorrectly allocated named re-entrancy locks
- CVE-2022-24845 Integer bounds error in Vyper
- CVE-2022-29255 Multiple evaluation of contract address in call in vyper
Sources
Also known as GHSA-2p94-8669-xg86, PYSEC-2025-29.