---
title: "GitHub Invalid custom pattern API arguments return 422: 2026-10-20 | Harbyn"
description: "GitHub Invalid custom pattern API arguments return 422, announced Oct 20, 2026."
canonical: "https://harbyn.com/changes/github/2026-10-20-updates-to-github-secret-scanning-6"
last-updated: 2026-10-25
---

# GitHub Invalid custom pattern API arguments return 422

Markdown version of <https://harbyn.com/changes/github/2026-10-20-updates-to-github-secret-scanning-6>.

Behavior change - GitHub. low severity. In effect.

Requests rejected by the scanning service for invalid arguments now return 422 instead of 500, allowing integrations to distinguish input errors from server failures.

## Facts

| Fact | Value |
| --- | --- |
| Vendor | [GitHub](https://harbyn.com/vendors/github.md) |
| Kind | Behavior change |
| Severity | low |
| Status | In effect |
| Announced | Oct 20, 2026 |
| Added to Harbyn | Oct 25, 2026 |
| Lead time | No dated deadline |
| Vendor page | <https://github.blog/changelog/2026-10-20-updates-to-github-secret-scanning> |
| Review | Reviewed by a person, extracted by a model |

## Find it in your code

```sh
npx harbyn scan
```

This change names no identifier the scanner can match line by line, so the scan tells you whether your repository uses GitHub, from its packages and API hosts. Nothing leaves your machine.

## Sources

Where this event comes from: the page we read, when we read it, and the hash of that snapshot.

- <https://github.blog/changelog/feed/> (changelog, fetched 2026-10-21 14:31 UTC, sha256 `53b365303c942fee23a6f670d1a1fb27530d96018bd40717a61a78ef7d38d365`)

## Related changes

### More from GitHub

- [Dismissal-request webhooks include request number](https://harbyn.com/changes/github/2026-10-20-updates-to-github-secret-scanning.md) (Behavior change, announced Oct 20, 2026)
- [Custom pattern alerts remain open after matching rescans](https://harbyn.com/changes/github/2026-10-20-updates-to-github-secret-scanning-3.md) (Behavior change, announced Oct 20, 2026)
- [Bypass-request API responses and webhooks include corrected metadata](https://harbyn.com/changes/github/2026-10-20-updates-to-github-secret-scanning-4.md) (Behavior change, announced Oct 20, 2026)
- [Delegated bypass push and reviewer configuration errors fixed](https://harbyn.com/changes/github/2026-10-20-updates-to-github-secret-scanning-5.md) (Behavior change, announced Oct 20, 2026)

### Changes at other vendors

- [Amazon Selling Partner API: ORDER\_CHANGE notifications add PreFulfillmentStatusChange for Amazon Autos](https://harbyn.com/changes/amazon-sp-api/2026-10-14-sp-api-updates-new-listings-items-api-ivp-values-in-eu5-jp-and-ca-stores-oct-3.md) (effective Oct 28, 2026)
- [BigCommerce: 301 redirects will apply only to storefront channels](https://harbyn.com/changes/bigcommerce/2026-10-07-301-redirects-now-apply-to-storefront-channels-only.md) (effective Nov 10, 2026)
- [Jira / Atlassian Cloud: New IP address ranges in use from January 1, 2027](https://harbyn.com/changes/atlassian-jira/2026-10-16-atlassian-cloud-adds-new-ip-address-ranges.md) (effective Jan 1, 2027)
- [Let's Encrypt: Default certificate lifetime changes to 64 days](https://harbyn.com/changes/letsencrypt/2026-10-07-64-day-certificate-lifetimes-coming-feb-2027.md) (effective Feb 10, 2027)

[All upcoming deadlines](https://harbyn.com/deadlines.md)