# Gotenberg has an SSRF deny-list bypass in IsPublicIP via IPv6 6to4 / NAT64 / site-local prefixes

Advisory record · `GHSA-86m8-88fq-xfxp`

- **Identifiers:** `GHSA-86m8-88fq-xfxp` · `CVE-2026-45741` · `GO-2026-5244`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-184](https://cwe.mitre.org/data/definitions/184.html) · [CWE-918](https://cwe.mitre.org/data/definitions/918.html)
- **Tags:** [Server-side request forgery (SSRF)](https://agentprime.io/advisories/tag/ssrf.md) · [CWE-184](https://agentprime.io/advisories/tag/cwe-184.md)
- **Published:** 29 May 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 29 May 2026, 16:50 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 `<=8.32.0`; no fixed version yet

## Machine-written summary

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

> Gotenberg versions up to and including 8.32.0 contain a flaw in the IsPublicIP check, which wrongly treats some IPv6 addresses (6to4, NAT64, and deprecated site-local prefixes) as public. An unauthenticated attacker who controls a DNS AAAA record may be able to reach internal destinations such as cloud metadata services, and the Chromium URL conversion route can return the response contents. No fix is listed; as a workaround, restrict outbound requests to trusted hosts or block these IPv6 prefixes at the network level.

Written 1 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:H/PR:N/UI:N/S:C/C:H/I:L/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0037, the 31st percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:13 UTC: First seen by agentprime
- 31 Oct 2026, 14:13 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-86m8-88fq-xfxp)

## Sources

- [GitHub Advisory Database: GHSA-86m8-88fq-xfxp](https://github.com/advisories/GHSA-86m8-88fq-xfxp)
- [OSV: GHSA-86m8-88fq-xfxp](https://osv.dev/vulnerability/GHSA-86m8-88fq-xfxp)
- <https://github.com/gotenberg/gotenberg/security/advisories/GHSA-86m8-88fq-xfxp>
- <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-86m8-88fq-xfxp>, 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-86m8-88fq-xfxp/>. Everything for agents: <https://agentprime.io/llms.txt>.