Gotenberg has an unauthenticated denial of service via echo.Context pool reuse in webhook async goroutine — CVE-2026-42594

Summary

## Summary The webhook middleware spawns a goroutine that holds a reference to the request's `echo.Context` after the synchronous handler returns `ErrAsyncProcess` and Echo recycles the context back to its `sync.Pool`. When a concurrent request claims the recycled context, `c.Reset()` clears the store. If the webhook goroutine reaches `hardTimeoutMiddleware` at that moment, an unchecked type assertion on a nil…

Product

go: github.com/gotenberg/gotenberg/v8

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

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