CVE-2026-42596: Gotenberg is a Docker-powered stateless API for PDF files

Q: How do I fix CVE-2026-42596?

gotenberg: upgrade to 8.31.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-42596 being exploited?

CVE-2026-42596 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-42596 affect?

CVE-2026-42596 affects gotenberg. Severity is critical (CVSS 9.4). Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.31.0, the default deny-lists used by Gotenberg's downloadFrom feature and webhook feature are bypassable. Because the filter is regex-based and case-sensitive, an unauthe

Q: How urgent is CVE-2026-42596?

Priority 67/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

This week

CRITICAL 9.4REMOTEWATCHLISTUPGRADE

CVE-2026-42596 is a critical-severity flaw (CVSS 9.4) affecting gotenberg. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.31.0, the default deny-lists used by Gotenberg's downloadFrom feature and webhook feature are bypassable. Because the filter is regex-based and case-sensitive, an unauthenticated attacker can supply URLs such as http://[::ffff:127.0.0.1]:... and reach loopback or private HTTP services that the default deny-list is intended to block. This crosses a real security boundary because

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.4 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-05-14
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: thecodingmachine

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-14 16:16 UTCPublished CVE record published
2026-06-17 10:48 UTCUpdated Record last modified

thecodingmachine gotenberg UPGRADE

Affected: < 8.31.0

Fixed in: 8.31.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy gotenberg || rpm -q gotenberg || gotenberg --version

2. UPGRADE to 8.31.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade gotenberg

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade gotenberg

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Go · github.com/gotenberg/gotenberg/v8 · FIXED · 8.32.0 · vulnerable: <= 8.30.1 · source

go get github.com/gotenberg/gotenberg/v8@v8.32.0 go list -m github.com/gotenberg/gotenberg/v8

Fedora 46 · proftpd · FIXED · 1.3.9e-1.fc46 · FEDORA-2026-fc0d87d66e · source

sudo dnf upgrade --advisory=FEDORA-2026-fc0d87d66e

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/gotenberg/gotenberg/security/advisories/GHSA-4vmc-gm8v-m35h
Nuclei scan template: Gotenberg < 8.31.0 - Server-Side Request Forgery

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42596?

gotenberg: upgrade to 8.31.0. Exact commands for each OS are on this page.

Is CVE-2026-42596 being exploited?

CVE-2026-42596 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42596 affect?

CVE-2026-42596 affects gotenberg. Severity is critical (CVSS 9.4). Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.31.0, the default deny-lists used by Gotenberg's downloadFrom feature and webhook feature are bypassable. Because the filter is regex-based and case-sensitive, an unauthe

How urgent is CVE-2026-42596?

Priority 67/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Docker vulnerabilities

Related CVEs

CVE-2026-40280 HIGH 7.5 UPGRADE Gotenberg is an API-based document conversion tool
CVE-2026-39383 HIGH 7.2 UPGRADE Gotenberg is an API-based document conversion tool
CVE-2026-42597 MEDIUM 5.9 UPGRADE Gotenberg is a Docker-powered stateless API for PDF files
CVE-2026-42595 HIGH 8.6 UPGRADE Gotenberg is a Docker-powered stateless API for PDF files
CVE-2026-42594 HIGH 7.5 UPGRADE Gotenberg is a Docker-powered stateless API for PDF files

References

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