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TI-2026-21492 Aliases CVE-2026-27018GHSA-jjwv-57xh-xr6r

Gotenberg: Chromium deny-list bypass via case-insensitive URL scheme

Priority HIGH 73CWE-22Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.

Summary

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 it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01701 77th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed gotenberg (gotenberg): 8.29.0github.com/gotenberg/gotenberg/v8 (Go): 8.29.0

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 8.29.08.29.0Patch availableCNA
—github.com/gotenberg/gotenberg/v8 (Go)before 8.29.08.29.0Patch availableGHSA-jjwv-57xh-xr6r
—github.com/gotenberg/gotenberg/v7 (Go)up to 7.10.2—No fix listedGHSA-jjwv-57xh-xr6r
  • gotenberg Vendorgotenberg Affected before 8.29.0 Fixed in 8.29.0 Patch available CNA
  • github.com/gotenberg/gotenberg/v8 (Go) Vendor— Affected before 8.29.0 Fixed in 8.29.0 Patch available GHSA-jjwv-57xh-xr6r
  • github.com/gotenberg/gotenberg/v7 (Go) Vendor— Affected up to 7.10.2 Fixed in — No fix listed GHSA-jjwv-57xh-xr6r

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:thecodingmachine:gotenberg:*:*:*:*:*:*:*:*before 8.29.0Vulnerablegotenberg
  • cpe:2.3:a:thecodingmachine:gotenberg:*:*:*:*:*:*:*:* Versions before 8.29.0 Vulnerable ·gotenberg

Remediation

  • Fix · CNA gotenberg (gotenberg) Fixed in 8.29.0
  • Fix · GHSA-jjwv-57xh-xr6r github.com/gotenberg/gotenberg/v8 (Go) Fixed in 8.29.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-27018
  2. 2026-10-03 Alias added: GHSA-jjwv-57xh-xr6r

References

Exploit 1

Patch 2

Advisory 1

Other 3

  • 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-2026-30876 Gotenberg: Unauthenticated SSRF via default deny-list bypass in downloadFrom and webhook CVSS 3.1CRITICAL 9.4
  • 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
See all 21 →

Sources

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