{"cve":"CVE-2023-46232","nvd":{"published":"2023-10-25T22:15:09.477","modified":"2026-06-17T06:30:27.360","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3},"cwes":["CWE-471"],"references":["https://github.com/matter-labs/era-compiler-vyper/commit/8be305a1b9c68d0fd47dad3434224ed85944ca25","https://github.com/matter-labs/era-compiler-vyper/security/advisories/GHSA-h8jv-969m-94r4","https://github.com/matter-labs/era-system-contracts/blob/main/contracts/ImmutableSimulator.sol#L37","https://github.com/matter-labs/era-compiler-vyper/commit/8be305a1b9c68d0fd47dad3434224ed85944ca25","https://github.com/matter-labs/era-compiler-vyper/security/advisories/GHSA-h8jv-969m-94r4"],"products":["matter-labs:zkvyper"],"source":"nvd","synced_at":"2026-10-19T21:40:11.519948003+00:00"},"epss":{"cve":"CVE-2023-46232","score":0.00694,"percentile":0.52961,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}