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Retool: React App Builder Sandbox Installs May Fail to Install Dependencies

Impact: majorStatus: resolvedStarted Resolved (5.9 h)5 updatesSource: stspg.io (opens in new tab)
Summary

Retool reported a major React App Builder incident: downstream dependency issues could prevent sandbox installation and connection on Cloud and Self-Hosted instances. It ran from 2026-08-20 17:26 UTC to 2026-08-20 23:20 UTC (5 h 54 min); Cloud recovered at 17:30 UTC, and self-hosted fixes shipped in 4.0.12-stable and 4.43.0-edge.

Machine-written from the archived incident (Sol). Check the timeline before relying on it.

Affected components: Self Hosted On-PremiseNew app builder

Timeline of updates

  1. investigating

    Retool's app builder may fail to install and connect to a sandbox due to downstream dependency issues. This affects both Cloud and Self-Hosted Retool instances.

  2. identified

    This issue no longer affects the React App Builder on Retool Cloud. We have identified the issue for self-hosted, and are working on releasing images with a fix

  3. identified

    This issue affects Retool version 4.0.0+ (stable and edge), specifically for 1) newly-created React apps, 2) new publishes of existing React apps, and 3) cold starts of sandboxes when editing existing React apps. Existing published apps that do not get published after August 19th are unaffected. Self-hosted customers can update to 4.43.0-edge to get an immediate fix. A patch to our stable release channel is coming soon.

  4. monitoring

    Images with the fix are out: 4.0.12-stable 4.43.0-edge Our minimum release age for React app builder dependencies is 5 days, so this incident will self-resolve for any self-hosted deployments that don't upgrade on August 24th, by 7am PST. All currently affected self-hosted versions: stable: 4.0.0 - 4.0.11 edge: 4.1, 4.9, 4.16, 4.19, 4.23, 4.27, 4.31, 4.35, 4.40

  5. resolved

    This incident is resolved. Images with the fix are out: 4.0.12-stable 4.43.0-edge Our minimum release age for React app builder dependencies is 5 days, so this incident will self-resolve for any self-hosted deployments that don't upgrade on August 24th, by 7am PST. All currently affected self-hosted versions: stable: 4.0.0 - 4.0.11 edge: 4.1, 4.9, 4.16, 4.19, 4.23, 4.27, 4.31, 4.35, 4.40

Rewindex changes for this incident

Impact, status and times are the vendor’s own, as last archived. View on stspg.io (opens in new tab). Retool profile · Recent Retool incidents · Markdown · JSON