CVE-2026-45742
HighCVSS 7.5Summary
Gotenberg from version 8.10.0 until 8.33.0 has a race condition in the newContext function in pkg/modules/api/context.go, where multiple goroutines concurrently write to shared maps and slices. A crafted multipart request with many downloadFrom entries can trigger a fatal 'concurrent map writes' runtime error and terminate the process. The default configuration allows unauthenticated remote attacks, leading to denial of service. This issue is fixed in version 8.33.0.
Risk Assessment
A remote attack can crash the document conversion service, leading to unavailability for users and disruption of business processes.
Recommendation
Update Gotenberg to version 8.33.0 or later.
Original NVD description (English source)
Gotenberg is a Docker-powered stateless API for PDF files. From 8.10.0 until 8.33.0, the newContext function in pkg/modules/api/context.go starts one errgroup.Go goroutine for each multipart downloadFrom entry and allows those goroutines to concurrently write to the shared ctx.files, ctx.diskToOriginal, and ctx.filesByField maps and slices. Go maps and slices are not safe for concurrent mutation, so a crafted multipart request containing many downloadFrom entries can trigger a data race and terminate the process with a fatal concurrent map writes runtime error. The default configuration enables downloadFrom and disables authentication, allowing an unauthenticated remote attacker to crash an exposed conversion service and cause a denial of service. This issue is fixed in version 8.33.0.