Vulnerability in Matter-Labs Era-Compiler-Vyper
CVE-2023-46232
era-compiler-vyper is the EraVM Vyper compiler for zkSync Era, a layer 2 rollup that uses zero-knowledge proofs to scale Ethereum. Prior to era-compiler-vype version 1.3.10, a bug prevented the initialization of the first immutable variable for Vyper contracts meeting certain criteria. The problem arises when there is a String or Array with more 256-bit words allocated than initialized. It results in the second word’s index unset, that is effectively set to 0, so the first immutable value with the actual 0 index is overwritten in the ImmutableSimulator. Version 1.3.10 fixes this issue by setting all indexes in advance. The problem will go away, but it will get more expensive if the user allocates a lot of uninitialized space, e.g. `String[4096]`. Upgrading and redeploying affected contracts is the only way of working around the issue.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.006 (44.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Matter-Labs Era-Compiler-Vyper — versions < 1.3.10
- Matter-Labs Zkvyper
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2023-46232?
- CVE-2023-46232 is a medium-severity vulnerability in Matter-Labs Era-Compiler-Vyper, classified under Modification of Assumed-Immutable Data (MAID). CVSS score: 5.3/10. Published 2023-10-25.
- How severe is CVE-2023-46232?
- Medium severity. CVSS v3 base score is 5.3 out of 10.