CVE-2026-27018: Gotenberg is an API for converting document formats

Q: How do I fix CVE-2026-27018?

gotenberg: upgrade to 8.29.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-27018 being exploited?

CVE-2026-27018 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-2026-27018 affect?

CVE-2026-27018 affects gotenberg. Severity is high (CVSS 7.5). Gotenberg is an API for converting document formats. Prior to version 8.29.0, the fix introduced for CVE-2024-21527 can be bypassed using mixed-case or uppercase URL schemes. This issue has been patched in version 8.29.0.

Q: How urgent is CVE-2026-27018?

Priority 56/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-27018 is a high-severity flaw (CVSS 7.5) affecting gotenberg. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Gotenberg is an API for converting document formats. Prior to version 8.29.0, the fix introduced for CVE-2024-21527 can be bypassed using mixed-case or uppercase URL schemes. This issue has been patched in version 8.29.0.

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	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-22, CWE-918
Published	2026-03-30
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

2026-03-30 21:17 UTCPublished CVE record published
2026-06-17 10:26 UTCUpdated Record last modified

thecodingmachine gotenberg UPGRADE

Affected: < 8.29.0

Fixed in: 8.29.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 8.29.0 (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 · 8.29.0 · vulnerable: < 8.29.0 · source

go get github.com/gotenberg/gotenberg/v8@v8.29.0 go list -m github.com/gotenberg/gotenberg/v8

Go · github.com/gotenberg/gotenberg/v7 · NO FIX YET · vulnerable: <= 7.10.2 · source

Fedora ELN · perl-Encode · FIXED · 3.25-528.eln159 · FEDORA-2026-79991d0238 · source

sudo dnf upgrade --advisory=FEDORA-2026-79991d0238

Fedora 46 · fonttools · FIXED · 4.68.0-1.fc46 · FEDORA-2026-65d6c01c75 · source

sudo dnf upgrade --advisory=FEDORA-2026-65d6c01c75

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-2026-27018?

gotenberg: upgrade to 8.29.0. Exact commands for each OS are on this page.

Is CVE-2026-27018 being exploited?

CVE-2026-27018 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-2026-27018 affect?

CVE-2026-27018 affects gotenberg. Severity is high (CVSS 7.5). Gotenberg is an API for converting document formats. Prior to version 8.29.0, the fix introduced for CVE-2024-21527 can be bypassed using mixed-case or uppercase URL schemes. This issue has been patched in version 8.29.0.

How urgent is CVE-2026-27018?

Priority 56/100. 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-2026-39383 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-2026-42596 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

References

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