Vulnerability · Published May 14, 2026 · Assigned by GitHub_M
CVE-2026-42594Gotenberg: Unauthenticated denial of service via echo.Context pool reuse in webhook async goroutine
High 7.5
In plain English
A high-severity race condition in gotenberg from gotenberg. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 29% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.32.0, 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 store entry panics outside any recover() scope, crashing the Gotenberg process. Any anonymous caller reaches the webhook path (default webhook-deny-list filters only the webhook destination, not the submitter). A single-source stress of ~24 webhook requests plus ~60 GET /version requests crashes the process in about two seconds. This vulnerability is fixed in 8.32.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/gotenberg/gotenberg/v7 | no fix listed | GO-2026-5605 |
| Go | github.com/gotenberg/gotenberg/v8 | 8.32.0 | GHSA-r33j-c622-r6qp |
| Go | github.com/gotenberg/gotenberg/v8 | 8.32.0 | GO-2026-5605 |
Affected products (as reported)
Weakness: CWE-362 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/gotenberg/gotenberg/security/advisories/GHSA-r33j-c622-r6qp x_refsource_CONFIRM