What’s Vulnerable › Vulnerabilities

CVE-2026-27018: Gotenberg: Chromium deny-list bypass via case-insensitive URL scheme

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-30 · updated 2026-06-17
• Weakness: CWE-22

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.

Affected products

• gotenberg: before 8.29.0 — fixed in 8.29.0

How to fix

Upgrade to a fixed version: gotenberg 8.29.0. Check the vendor advisory for mitigations.

References

• https://github.com/gotenberg/gotenberg/commit/06b2b2e10c52b58135edbfe82e94d599eb0c5a11
• https://github.com/gotenberg/gotenberg/commit/8625a4e899eb75e6fcf46d28394334c7fd79fff5
• https://github.com/gotenberg/gotenberg/releases/tag/v8.29.0
• https://github.com/gotenberg/gotenberg/security/advisories/GHSA-jjwv-57xh-xr6r
• https://github.com/gotenberg/gotenberg/security/advisories/GHSA-jjwv-57xh-xr6r

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