# Gotenberg: SSRF via LibreOffice document processing

Advisory record · `GHSA-2mrg-35hw-x3x9`

- **Identifiers:** `GHSA-2mrg-35hw-x3x9` · `CVE-2026-55229` · `GO-2026-5060`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-918](https://cwe.mitre.org/data/definitions/918.html)
- **Tags:** [Server-side request forgery (SSRF)](https://agentprime.io/advisories/tag/ssrf.md)
- **Published:** 18 Jun 2026
- **Updated:** 25 Jun 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 18 Jun 2026, 13:04 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `github.com/gotenberg/gotenberg/v8` (Go): affected `<8.34.0`; fixed in `8.34.0`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> GHSA-2mrg-35hw-x3x9: Gotenberg versions before 8.34.0 are affected, and the advisory reports the issue in v8.33.0 under the default configuration. An attacker who can upload a crafted DOCX file to the LibreOffice conversion endpoint can cause the server to make outbound HTTP(S) requests to attacker-chosen destinations, and can also make it embed local image files into the output. Upgrade to Gotenberg 8.34.0 or later. The source gives no workaround.

Written 7 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.015, the 74th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:07 UTC: First seen by agentprime
- 31 Oct 2026, 15:07 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-2mrg-35hw-x3x9)

## Sources

- [GitHub Advisory Database: GHSA-2mrg-35hw-x3x9](https://github.com/advisories/GHSA-2mrg-35hw-x3x9)
- [OSV: GHSA-2mrg-35hw-x3x9](https://osv.dev/vulnerability/GHSA-2mrg-35hw-x3x9)
- <https://github.com/gotenberg/gotenberg/security/advisories/GHSA-2mrg-35hw-x3x9>
- <https://github.com/gotenberg/gotenberg>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-2mrg-35hw-x3x9>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-2mrg-35hw-x3x9/>. Everything for agents: <https://agentprime.io/llms.txt>.