What is CVE-2026-27018?

CVE-2026-27018 is a high-severity vulnerability in Gotenberg, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-03-30.

How severe is CVE-2026-27018?

High severity. CVSS v3 base score is 7.5 out of 10.

Path Traversal in Gotenberg

CVE-2026-27018

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.

Vulnerability class: Path Traversal (Directory Traversal)

Published 2026-03-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.016 (75.3th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 75.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.016 · change: -0.001

Affected products

Gotenberg — versions < 8.29.0
Thecodingmachine Gotenberg

Weakness classification (CWE)

References

github.com/gotenberg/gotenberg/security/advisories/GHSA-jjwv-57xh-xr6r (Exploit, Mitigation, Vendor Advisory)
github.com/gotenberg/gotenberg/commit/06b2b2e10c52b58135edbfe82e94d599eb0c5a11 (Patch)
github.com/gotenberg/gotenberg/commit/8625a4e899eb75e6fcf46d28394334c7fd79fff5 (Patch)
github.com/gotenberg/gotenberg/releases/tag/v8.29.0 (Product, Release Notes)

Frequently asked questions

What is CVE-2026-27018?: CVE-2026-27018 is a high-severity vulnerability in Gotenberg, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-03-30.
How severe is CVE-2026-27018?: High severity. CVSS v3 base score is 7.5 out of 10.