CVE-2023-32058 Vyper vulnerable to integer overflow in loop

What is CVE-2023-32058?

CVE-2023-32058 is a high-severity vulnerability in vyperlang vyper, published on 11 May 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Vyper is a Pythonic smart contract language for the Ethereum virtual machine. Prior to version 0.3.8, due to missing overflow check for loop variables, by assigning the iterator of a loop to a variable, it is possible to overflow the type of the latter. The issue seems to happen only in loops of type `for i in range(a, a + N)` as in loops of type `for i in range(start, stop)` and `for i in range(stop)`, the compiler is able to raise a `TypeMismatch` when trying to overflow the variable. The problem has been patched in version 0.3.8.

Weakness: CWE-190

Which versions are affected by CVE-2023-32058?

3 open source packages ship an affected version, including vyper. It affects 1 product.

Products include Vyperlang Vyper.

How do I fix CVE-2023-32058?

Upgrade vyper to 0.3.8 or later.

Is CVE-2023-32058 being exploited?

There is no known exploitation of CVE-2023-32058 in the wild and no public exploit code.

Other vulnerabilities in vyperlang vyper

• CVE-2024-24563 Vyper array negative index vulnerability Critical 9.8
• CVE-2024-24561 Vyper bounds check on built-in `slice()` function can be overflowed Critical 9.8
• CVE-2023-39363 Vyper incorrectly allocated named re-entrancy locks Critical 9.1
• CVE-2022-24845 Integer bounds error in Vyper High 8.8
• CVE-2022-29255 Multiple evaluation of contract address in call in vyper High 8.2

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-6r8q-pfpv-7cgj, PYSEC-2023-78.