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.
CVE-2023-46232
This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 46% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
- Lower severity and no public exploit yet
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 5.3
- EG Score
- 5.3(medium)
- EPSS
- 42.9%
- KEV
- Not listed
Published
October 25, 2023
Last Modified
June 17, 2026
References (6)
- security-advisories@githubhttps://github.com/matter-labs/era-compiler-vyper/commit/8be305a1b9c68d0fd47dad3434224ed85944ca25
- security-advisories@githubhttps://github.com/matter-labs/era-compiler-vyper/security/advisories/GHSA-h8jv-969m-94r4
- security-advisories@githubhttps://github.com/matter-labs/era-system-contracts/blob/main/contracts/ImmutableSimulator.sol#L37
- af854a3a-2127-422b-91ae-364da2661108https://github.com/matter-labs/era-compiler-vyper/commit/8be305a1b9c68d0fd47dad3434224ed85944ca25
- af854a3a-2127-422b-91ae-364da2661108https://github.com/matter-labs/era-compiler-vyper/security/advisories/GHSA-h8jv-969m-94r4
- af854a3a-2127-422b-91ae-364da2661108https://github.com/matter-labs/era-system-contracts/blob/main/contracts/ImmutableSimulator.sol#L37
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 9× in last 7d / 45× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
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- 2026-05-24 15:04 UTCEG score recompute
- 2026-05-23 17:35 UTCOSV refresh
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