# Materialize: Degraded availability for Cloud customers in us-west-2 due to upstream AWS credential service disruption

- Impact (vendor’s label): minor
- Status: resolved
- Started: 2026-09-03 21:12 UTC · Resolved: 2026-09-03 21:43 UTC · Duration: 31 min
- Updates: 1 · Affected components: aws/us-west-2
- [Vendor status page: https://status.materialize.com/incidents/01M1PJHPS1ETAZWAGNP4602S80](https://status.materialize.com/incidents/01M1PJHPS1ETAZWAGNP4602S80)
- [Company: Materialize](https://rewindex.com/company/materialize.md)

## Part of an outage event

- [AWS us-west-2 outage, Sep 3, 2026: 20 vendors, 20 incidents](https://rewindex.com/events/2026-09-03-aws-us-west-2)
- This incident blames AWS as the cause. (hop 1, posted −38 min vs AWS’s own post)
- Evidence: “…Degraded availability for Cloud customers in us-west-2 due to upstream AWS credential service disruption Between 21:12 UTC and 22:18 UTC on September 3, AWS experienced elevated error rates in its Sec…”

```mermaid
flowchart LR
  root["AWS us-west-2<br/>posted 21:49 UTC"]:::root
  before["Posted before AWS did<br/>3 vendors, 3 blamed AWS<br/>Materialize, Temporal Cloud, Semgrep"]:::blames
  root --> before
  h1["Within an hour<br/>4 vendors, 4 blamed AWS<br/>Dropbox, Teleport, Wiz, SurveyMonkey"]:::blames
  root --> h1
  me["Materialize (this incident)<br/>posted −38 min"]:::me
  before --- me
```

_Detected automatically from incidents that started together and named the same provider; a link means one incident named another vendor, not a confirmed cause._

## Timeline of updates

- **resolved** 2026-09-03 21:43 UTC: Between 21:12 UTC and 22:18 UTC on September 3, AWS experienced elevated error rates in its Security Token Service (STS) in the us-west-2 region, which AWS reported on its Health Dashboard. Materialize environments in that region use STS to obtain credentials for object storage access, and requests for those credentials failed or timed out during the event.   Some environments in the region experienced degraded performance during this window. Query results remained correct throughout, and no data was lost. The upstream issue was resolved by AWS at 22:18 UTC and all affected environments recovered.


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Canonical: https://rewindex.com/company/materialize/incidents/01M1PJHPS1ETAZWAGNP4602S80 · Markdown: https://rewindex.com/company/materialize/incidents/01M1PJHPS1ETAZWAGNP4602S80.md · JSON: https://rewindex.com/api/v1/companies/materialize/incidents/01M1PJHPS1ETAZWAGNP4602S80 · Generated 2026-10-19T23:15:23.709Z