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CVE-2026-42596

Thecodingmachine Gotenberg server-side request forgery (SSRF)

9.4 CRITICALPublic exploitEPSS 1.77%
  1. Published14 May 2026

Description

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 an external caller can force the server to make outbound requests to internal-only targets. This vulnerability is fixed in 8.31.0.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityLow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

Affected products

Thecodingmachine Gotenberg< 8.31.0

Remediation

Fixed in
Thecodingmachine Gotenberg≥ 8.31.0

References

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Frequently asked

Is CVE-2026-42596 being actively exploited?

CVE-2026-42596 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.77%.

How severe is CVE-2026-42596?

CVE-2026-42596 has a CVSS 3.1 base score of 9.4, rated critical. EPSS estimates a 1.77% probability of exploitation.

Which products are affected by CVE-2026-42596?

Affected products include Thecodingmachine Gotenberg.

How do I fix CVE-2026-42596?

Upgrade affected software to a fixed version, for example Thecodingmachine Gotenberg 8.31.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-42596 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.