CVE-2026-39383: Gotenberg is an API-based document conversion tool

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HIGH 7.2REMOTEUPGRADE

CVE-2026-39383 is a high-severity flaw (CVSS 7.2) affecting gotenberg. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Gotenberg is an API-based document conversion tool. In version 8.29.1, an unauthenticated attacker with network access can force the server to make outbound HTTP POST requests to arbitrary internal or external destinations by supplying a crafted URL in the Gotenberg-Webhook-Url request header. The FilterDeadline function in filter.go is intended to gate outbound URLs, but when both the allow-list and deny-list are empty (the default configuration

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-05-05
Last modified	2026-07-24

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

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-05 21:16 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

thecodingmachine gotenberg UPGRADE

Affected: >= 8.29.1 and < 8.31.0

Fixed in: 8.31.0

Safe to downgrade to: a release before 8.29.1

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.

3. If no update is available yet, DOWNGRADE to a release before 8.29.1 (Debian / Ubuntu)

apt-cache madison gotenberg sudo apt install gotenberg=<VERSION_BEFORE_8.29.1> sudo apt-mark hold gotenberg

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list gotenberg sudo dnf downgrade gotenberg-<VERSION_BEFORE_8.29.1> sudo dnf versionlock add gotenberg

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-39383?

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

Is CVE-2026-39383 being exploited?

CVE-2026-39383 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-2026-39383 affect?

CVE-2026-39383 affects gotenberg. Severity is high (CVSS 7.2). Gotenberg is an API-based document conversion tool. In version 8.29.1, an unauthenticated attacker with network access can force the server to make outbound HTTP POST requests to arbitrary internal or external destinations by supplying a cr

How urgent is CVE-2026-39383?

Priority 39/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-40280 HIGH 7.5 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-2026-42596 CRITICAL 9.4 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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