What is CVE-2026-35458?

CVE-2026-35458 is a critical-severity vulnerability in Gotenberg, classified under Inefficient Regular Expression Complexity. CVSS score: 9.8/10. Published 2026-04-07.

How severe is CVE-2026-35458?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Gotenberg

CVE-2026-35458

Gotenberg is an API for converting document formats. In 8.29.1 and earlier, Gotenberg uses dlclark/regexp2 to compile user-supplied scope patterns without setting a proper timeout. Users with access to features using this logic can hang workers indefinitely.

Vulnerability class: ReDoS (Regular Expression Denial of Service)

Published 2026-04-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (47.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.001

Affected products

Gotenberg — versions <= 8.29.1
Thecodingmachine Gotenberg

Weakness classification (CWE)

CWE-1333 — Inefficient Regular Expression Complexity

References

github.com/gotenberg/gotenberg/security/advisories/GHSA-fmwg-qcqh-m992 (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-35458?: CVE-2026-35458 is a critical-severity vulnerability in Gotenberg, classified under Inefficient Regular Expression Complexity. CVSS score: 9.8/10. Published 2026-04-07.
How severe is CVE-2026-35458?: Critical severity. CVSS v3 base score is 9.8 out of 10.