CVE-2024-26149 Vyper _abi_decode Memory Overflow
Attackers can exploit an integer overflow in Vyper's _abi_decode to read memory outside array bounds, potentially compromising smart contract security.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-26149?
CVE-2024-26149 is a low-severity vulnerability in vyperlang vyper, published on 26 Feb 2024. 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. If an excessively large value is specified as the starting index for an array in `_abi_decode`, it can cause the read position to overflow. This results in the decoding of values outside the intended array bounds, potentially leading to exploitations in contracts that use arrays within `_abi_decode`. This vulnerability affects 0.3.10 and earlier versions.
Weakness: CWE-119
Which versions are affected by CVE-2024-26149?
3 open source packages ship an affected version, including vyper. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
vyper PyPI | All versions | 0.4.0 |
vyper PyPI | All versions | 0.4.0 |
vyper PyPI | All versions | 0.4.0b1 |
Products include Vyperlang Vyper.
How do I fix CVE-2024-26149?
Upgrade vyper to a fixed version for your release line: 0.4.0 or 0.4.0b1.
Is CVE-2024-26149 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-26149 exists.
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-9p8r-4xp4-gw5w, PYSEC-2024-164.