CVE-2026-27018
Gotenberg: Chromium deny-list bypass via case-insensitive URL scheme
Description
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.
INFO
Published Date :
March 30, 2026, 9:17 p.m.
Last Modified :
April 8, 2026, 3:57 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Gotenberg to version 8.29.0 or later.
- Verify the patch is applied correctly.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-27018.
| URL | Resource |
|---|---|
| https://github.com/gotenberg/gotenberg/commit/06b2b2e10c52b58135edbfe82e94d599eb0c5a11 | Patch |
| https://github.com/gotenberg/gotenberg/commit/8625a4e899eb75e6fcf46d28394334c7fd79fff5 | Patch |
| https://github.com/gotenberg/gotenberg/releases/tag/v8.29.0 | Product Release Notes |
| https://github.com/gotenberg/gotenberg/security/advisories/GHSA-jjwv-57xh-xr6r | Exploit Mitigation Vendor Advisory |
| https://github.com/gotenberg/gotenberg/security/advisories/GHSA-jjwv-57xh-xr6r | Exploit Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-27018 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-27018
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-27018 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-27018 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 08, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Added CPE Configuration OR *cpe:2.3:a:thecodingmachine:gotenberg:*:*:*:*:*:*:*:* versions up to (excluding) 8.29.0 Added Reference Type GitHub, Inc.: https://github.com/gotenberg/gotenberg/commit/06b2b2e10c52b58135edbfe82e94d599eb0c5a11 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/gotenberg/gotenberg/commit/8625a4e899eb75e6fcf46d28394334c7fd79fff5 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/gotenberg/gotenberg/releases/tag/v8.29.0 Types: Product, Release Notes Added Reference Type CISA-ADP: https://github.com/gotenberg/gotenberg/security/advisories/GHSA-jjwv-57xh-xr6r Types: Exploit, Mitigation, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/gotenberg/gotenberg/security/advisories/GHSA-jjwv-57xh-xr6r Types: Exploit, Mitigation, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Mar. 31, 2026
Action Type Old Value New Value Added Reference https://github.com/gotenberg/gotenberg/security/advisories/GHSA-jjwv-57xh-xr6r -
New CVE Received by [email protected]
Mar. 30, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-22 Added CWE CWE-918 Added Reference https://github.com/gotenberg/gotenberg/commit/06b2b2e10c52b58135edbfe82e94d599eb0c5a11 Added Reference https://github.com/gotenberg/gotenberg/commit/8625a4e899eb75e6fcf46d28394334c7fd79fff5 Added Reference https://github.com/gotenberg/gotenberg/releases/tag/v8.29.0 Added Reference https://github.com/gotenberg/gotenberg/security/advisories/GHSA-jjwv-57xh-xr6r