# RudderStack: Major incident: Incorrect MIME Type Headers for JavaScript SDK Plugin Artifacts

**Summary:** RudderStack reported a major incident: incorrect CDN MIME type headers (binary/octet-stream) caused modern browsers to reject JavaScript SDK plugin scripts, preventing plugin loading and losing instrumented events to RudderStack and device mode destinations. The incident started and was marked resolved at 2024-12-17 09:45 UTC, with a recorded duration of 0 min; impact varied across customers. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2024-12-17 09:45 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/flxrfp8xv79g](https://stspg.io/flxrfp8xv79g)
- [Company: RudderStack](https://rewindex.com/company/rudderstack.md)
- Versions: before (none: first archived) → after incident\_version:161/mcty7l290xdz@628a7afe29f2
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Incorrect MIME Type Headers for JavaScript SDK Plugin Artifacts
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2024-12-17 09:45 UTC
```

**5. Added: Resolved time**

```diff
+ 2024-12-17 09:45 UTC
```

**6. Added: Update** (resolved) · 2024-12-17 09:45 UTC

```diff
+ Incident Summary: RudderStack encountered an issue where JavaScript SDK plugin artifacts were served with incorrect MIME type headers (binary/octet-stream) from our CDN. This caused modern browsers to reject the scripts, resulting in plugin loading failures and a loss of instrumented events to RudderStack and device mode destinations. Impact: The issue did not affect all customers uniformly due to the nature of content distribution via the CDN. Some customers experienced the issue earlier as their regions picked up the changes, while others saw delayed or minimal impact. Resolution: The incorrect MIME type was promptly corrected to application/javascript, and normal functionality was restored. We sincerely apologize for any inconvenience caused and thank you for your understanding. If you have further questions or concerns, please contact our support team.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2024-12-17 09:45 UTC | Major incident: Incorrect MIME Type Headers for JavaScript SDK Plugin Artifacts (this change) | outage |

All RudderStack changes: [timeline](https://rewindex.com/company/rudderstack/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._


---
Canonical: https://rewindex.com/change/i5f11cceee795a6 · Markdown: https://rewindex.com/change/i5f11cceee795a6.md · JSON: https://rewindex.com/api/v1/changes/i5f11cceee795a6 · Generated 2026-10-18T03:55:40.489Z