gotenberg: critical vulnerability

gotenberg

Gotenberg is a Docker-powered stateless API for PDF files. In versions 8.30.1 and earlier, the metadata write endpoint validates metadata keys for control characters but leaves metadata values unsanitized.

Fix it

go get github.com/gotenberg/gotenberg/v8@v8.31.0

First seen: 27 Oct 2026
Last update: 27 Oct 2026, 19:18 UTC
Fixed in: github.com/gotenberg/gotenberg/v8 8.31.0
Identifiers: CVE-2026-40281
CVSS: 9.1
Source: news
On the menu as: Go

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## gotenberg: critical vulnerability
Severity: critical. Patch status: patched.
Affected: gotenberg
Fixed in: github.com/gotenberg/gotenberg/v8 8.31.0
Ids: CVE-2026-40281

Gotenberg is a Docker-powered stateless API for PDF files. In versions 8.30.1 and earlier, the metadata write endpoint validates metadata keys for control characters but leaves metadata values unsanitized.

## Steps
1. Search every lockfile and manifest (package-lock.json, yarn.lock, pnpm-lock.yaml, requirements*.txt, poetry.lock, uv.lock, composer.lock, go.sum, Cargo.lock, Gemfile.lock) for `github.com/gotenberg/gotenberg/v8`. For each hit, compare the installed version with the fix on the same major line: github.com/gotenberg/gotenberg/v8 8.31.0. If it's lower, give the exact upgrade command for the package manager this repo uses.

## Fix by release line
| Line | State | Fix | Until then |
|---|---|---|---|
| github.com/gotenberg/gotenberg/v8 <= 8.30.1 | fixed | 8.31.0 | — |

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-40281") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://github.com/gotenberg/gotenberg/commit/405f1069c026bb08f319fb5a44e5c67c33208318 https://nvd.nist.gov/vuln/detail/CVE-2026-40281
https://pwned.coffee/i/gotenberg-is-a-docker-powered-stateless-api-for-pdf-file-cve-2026-40281

Timeline

27 Oct 2026, 19:18 UTC
Fix status: unknown → patched.
27 Oct 2026
First reported.

Receipt

Exploitation: Public exploit code, no attacks reported
CISA ADP “CISA ADP rates exploitation of CVE-2026-40281 "poc" (SSVC).” source
Fix by release line: Product Affected Fixed in Source
github.com/gotenberg/gotenberg/v8 (go) <= 8.30.1 8.31.0 GitHub advisory checked 27 Oct
Score: CVSS 9.1 (critical). CVSS 3.1 9.1 (NVD) for CVE-2026-40281
Last checked: 27 Oct 2026, 19:18 UTC

Product	Affected	Fixed in	Source
github.com/gotenberg/gotenberg/v8 (go)	<= 8.30.1	8.31.0	GitHub advisory checked 27 Oct

Sources: KEV – CVE record ✓ Vendor ✓

Sources

Wrong fix version, or a source we missed? Send it back to chef@pwned.coffee with the source, and we'll correct it here.

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