CVE-2023-30837 Vyper storage allocator overflow
An integer overflow in the Vyper storage allocator allows attackers to overwrite the contract owner variable, leading to privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-30837?
CVE-2023-30837 is a high-severity vulnerability in vyperlang vyper, published on 8 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 EVM. The storage allocator does not guard against allocation overflows in versions prior to 0.3.8. An attacker can overwrite the owner variable. This issue was fixed in version 0.3.8.
Weakness: CWE-789
Which versions are affected by CVE-2023-30837?
3 open source packages ship an affected version, including vyper. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
vyper PyPI | All versions | 0.3.8 |
vyper PyPI | All versions | 0.3.8 |
vyper PyPI | All versions | 0.3.8 |
Products include Vyperlang Vyper.
How do I fix CVE-2023-30837?
Upgrade vyper to 0.3.8 or later.
Is CVE-2023-30837 being exploited?
There is no known exploitation of CVE-2023-30837 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-mgv8-gggw-mrg6, PYSEC-2023-76.