# CVE-2026-42594: Gotenberg race condition and process crash in webhook middleware

Source: https://junglewise.ai/threats/cve-2026-42594-gotenberg-race-condition-and-process-crash-in-webhook-middleware  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-14. Updated: 2026-05-16  
License: CC BY 4.0 with a link back

CVE-2026-42594 · Severity: high · CVSS 7.5 · Published 2026-05-14

Gotenberg is a specialized tool used to convert various file formats into PDFs via a web interface. A flaw in how the system handles background tasks (webhooks) allows an unauthenticated attacker to crash the entire service by sending a specific sequence of requests. This results in a denial-of-service, causing all active file conversions to fail and disrupting document processing workflows until the service is manually or automatically restarted.

Technologies: [github.com/gotenberg/gotenberg/v7 (Go)](https://junglewise.ai/threats/technologies/github-com-gotenberg-gotenberg-v7), [github.com/gotenberg/gotenberg/v8 (Go)](https://junglewise.ai/threats/technologies/github-com-gotenberg-gotenberg-v8), [Gotenberg](https://junglewise.ai/threats/technologies/gotenberg). Vendors: [Go](https://junglewise.ai/threats/vendors/go), [Gotenberg](https://junglewise.ai/threats/vendors/gotenberg).

## Quick answers

**Is CVE-2026-42594 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-42594 being exploited in the wild.

**How severe is CVE-2026-42594?** High severity, with a CVSS score of 7.5, published 14 May 2026.

**Which products and versions are affected?** github.com/gotenberg/gotenberg/v7 (Go) SEMVER:introduced=0; github.com/gotenberg/gotenberg/v8 (Go) <= 8.31.0, SEMVER:introduced=0,fixed=8.32.0; Gotenberg < 8.32.0, <= 8.31.0.

**Is there a fix for CVE-2026-42594?** Yes. github.com/gotenberg/gotenberg/v8 (Go): upgrade to 8.32.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-42594 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-42594?** Check whether you run github.com/gotenberg/gotenberg/v7 (Go), github.com/gotenberg/gotenberg/v8 (Go) or Gotenberg at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/gotenberg/gotenberg/v8 (Go): upgrade to 8.32.0 or later

  ```sh
  go get github.com/gotenberg/gotenberg/v8@v8.32.0
  ```


## Technical details

A race condition exists in the webhook middleware due to improper management of the Echo framework's context pool. When a webhook request is processed asynchronously, the middleware spawns a goroutine that retains a reference to the 'echo.Context' after the synchronous handler has already returned and recycled the context back into the 'sync.Pool'. If a concurrent request reclaims that context and resets it, the background goroutine may attempt an unchecked type assertion on a nil 'logger' entry within the 'hardTimeoutMiddleware'. Because this occurs outside of a recovery scope, it triggers a process-wide panic and crash. Attackers can reliably trigger this with a relatively low volume of concurrent webhook and status requests. The issue is resolved in version 8.32.0 by implementing guarded type assertions and better goroutine recovery.

## Affected products

- Gotenberg Gotenberg < 8.32.0

## Identifiers

- CVE-2026-42594
- GHSA-r33j-c622-r6qp
- GO-2026-5605

## Timeline

- 2026-04-30: advisory: GitHub Security Advisory published
- 2026-05-14: disclosed: NVD publication date

## References

- [https://github.com/gotenberg/gotenberg/security/advisories/GHSA-r33j-c622-r6qp](https://github.com/gotenberg/gotenberg/security/advisories/GHSA-r33j-c622-r6qp)

## Related threats

- [Gotenberg server-side request forgery in IsPublicIP IPv6 handling](https://junglewise.ai/threats/cve-2026-126799-gotenberg-8-31-0-before-8-38-0-contains-a-server-side-request)
- [Gotenberg race condition in multipart downloadFrom handling](https://junglewise.ai/threats/cve-2026-45742-gotenberg-race-condition-in-multipart-downloadfrom-handling)
- [Gotenberg SSRF deny-list bypass in IsPublicIP via IPv6 prefixes](https://junglewise.ai/threats/cve-2026-45741-gotenberg-ssrf-deny-list-bypass-in-ispublicip-via-ipv6-prefixes)
- [Gotenberg path traversal via Windows-style separators in ZIP entry names](https://junglewise.ai/threats/cve-2026-44829-gotenberg-path-traversal-via-windows-style-separators-in-zip)
- [Gotenberg SSRF and local file disclosure in LibreOffice conversion](https://junglewise.ai/threats/cve-2026-55229-gotenberg-ssrf-and-local-file-disclosure-in-libreoffice)