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TI-2026-30876 Aliases CVE-2026-42596GHSA-4vmc-gm8v-m35h

Gotenberg: Unauthenticated SSRF via default deny-list bypass in downloadFrom and webhook

Priority HIGH 80CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01589 75th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed gotenberg (gotenberg): 8.31.0github.com/gotenberg/gotenberg/v8 (Go): 8.32.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
gotenberggotenbergbefore 8.31.08.31.0Patch availableCNA
—github.com/gotenberg/gotenberg/v8 (Go)before 8.32.08.32.0Patch availableGHSA-4vmc-gm8v-m35h
  • gotenberg Vendorgotenberg Affected before 8.31.0 Fixed in 8.31.0 Patch available CNA
  • github.com/gotenberg/gotenberg/v8 (Go) Vendor— Affected before 8.32.0 Fixed in 8.32.0 Patch available GHSA-4vmc-gm8v-m35h

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:thecodingmachine:gotenberg:*:*:*:*:*:*:*:*before 8.31.0Vulnerablegotenberg
  • cpe:2.3:a:thecodingmachine:gotenberg:*:*:*:*:*:*:*:* Versions before 8.31.0 Vulnerable ·gotenberg

Remediation

  • Fix · CNA gotenberg (gotenberg) Fixed in 8.31.0
  • Fix · GHSA-4vmc-gm8v-m35h github.com/gotenberg/gotenberg/v8 (Go) Fixed in 8.32.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-42596
  2. 2026-10-03 Alias added: GHSA-4vmc-gm8v-m35h

References

Exploit 1

Advisory 1

Other 1

  • TI-2026-30869 Gotenberg: Unauthenticated RCE via ExifTool Metadata Key Injection CVSS 3.1CRITICAL 9.8
  • TI-2026-29063 Gotenberg vulnerable to argument injection via newlines in ExifTool metadata values CVSS 3.1CRITICAL 10.0
  • TI-2026-27588 Gotenberg has a ReDoS via extraHttpHeaders scope feature CVSS 4.0HIGH 8.7
  • TI-2026-30875 Gotenberg: Server-Side Request Forgery via Chromium URL Endpoint with Redirect-Based Deny-List Bypass CVSS 3.1HIGH 8.6
  • TI-2026-30871 Gotenberg: Server-Side Request Forgery (SSRF) in github.com/gotenberg/gotenberg/v8 CVSS 3.1HIGH 8.2
  • TI-2026-30870 Gotenberg: ExifTool group-prefix syntax bypasses dangerous-tag blocklist CVSS 3.1HIGH 8.2
See all 21 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences