# CVE-2026-42597: Gotenberg SSRF and Information Disclosure in Chromium URL routes

Source: https://junglewise.ai/threats/cve-2026-42597-gotenberg-ssrf-and-information-disclosure-in-chromium-url-routes  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-14. Updated: 2026-07-21  
License: CC BY 4.0 with a link back

CVE-2026-42597 · Severity: medium · CVSS 5.9 · Published 2026-05-14

Gotenberg, a tool used to convert various document formats into PDFs, contains a vulnerability that allows unauthorized users to access files belonging to other users. By sending a specially crafted request, an attacker can browse the server's temporary storage and read documents (such as HTML, Markdown, or Office files) while they are being processed. This could lead to the exposure of sensitive information in environments where multiple users share the same Gotenberg service.

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-2026-42597 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-42597 being exploited in the wild.

**How severe is CVE-2026-42597?** Medium severity, with a CVSS score of 5.9, published 14 May 2026.

**Which products and versions are affected?** github.com/gotenberg/gotenberg/v7 (Go) <= 7.10.2, SEMVER:introduced=0, SEMVER:introduced=0,last_affected=7.10.2; github.com/gotenberg/gotenberg/v8 (Go) <= 8.31.0, SEMVER:introduced=0,fixed=8.32.0; Gotenberg <= 7.10.2, <= 8.31.0.

**Is there a fix for CVE-2026-42597?** 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-2026-42597 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-42597?** 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 vulnerability in Gotenberg's Chromium-based URL conversion and screenshot routes allows for arbitrary file reads within the /tmp directory. The application's default deny-list intentionally exempts the 'file:///tmp/' scheme to allow local asset loading for HTML/Markdown routes, which are protected by a per-request 'AllowedFilePrefixes' guard. However, the URL-based routes fail to populate this guard, causing the enforcement logic to be skipped entirely. An unauthenticated attacker can use the 'file://' scheme to enumerate Gotenberg's working directories in /tmp and exfiltrate the raw source files of other users' active conversion requests. This is a timing-based attack that affects multi-tenant deployments. The issue is addressed in version 8.32.0.

## Affected products

- Gotenberg gotenberg/gotenberg/v7 <= 7.10.2
- Gotenberg gotenberg/gotenberg/v8 <= 8.31.0

## Identifiers

- CVE-2026-42597
- GHSA-g924-cjx7-2rjw
- GO-2026-5395

## Timeline

- 2026-04-30: advisory: GitHub Advisory published
- 2026-05-07: disclosed: CVE-2026-42597 published
- 2026-07-21: patched: Advisory updated with patch information for v8.32.0

## References

- [https://api.github.com/users/adrgs](https://api.github.com/users/adrgs)
- [https://github.com/adrgs](https://github.com/adrgs)
- [https://api.github.com/users/adrgs/gists%7B/gist_id%7D](https://api.github.com/users/adrgs/gists%7B/gist_id%7D)
- [https://api.github.com/users/adrgs/repos](https://api.github.com/users/adrgs/repos)
- [https://avatars.githubusercontent.com/u/11564377?v=4](https://avatars.githubusercontent.com/u/11564377?v=4)
- [https://api.github.com/users/adrgs/events%7B/privacy%7D](https://api.github.com/users/adrgs/events%7B/privacy%7D)

## 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)