9.4

CVE-2026-42596: Gotenberg: Unauthenticated SSRF via default deny-list bypass in downloadFrom and webhook

Analyzed
AliasesGHSA-4vmc-gm8v-m35hGO-2026-5132
Published 14-05-2026Last modified 15-05-2026

Vulnerability summary

CVE-2026-42596 is a critical (CVSS 9.4) Server-Side Request Forgery vulnerability in gotenberg. EPSS estimates a 1.59% chance of exploitation in the next 30 days, higher than 75.6% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Prioritisepublic exploit

Public exploit (GitHub, Date unknown)

Source freshness unavailable

How is this decided?
CVSS score
9.4/10
010
Critical · v3.1 (CVE.org)
EPSS score
1.59%
0%100%
Low · -0.18 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:21483-1

Timeline

  1. 14-05-2026
    PublishedVulnerability first disclosed.
  2. 15-05-2026
    Last modifiedVulnerability information updated.

Description

Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.31.0, the default deny-lists used by Gotenberg's downloadFrom feature and webhook feature are bypassable. Because the filter is regex-based and case-sensitive, an unauthenticated attacker can supply URLs such as http://[::ffff:127.0.0.1]:... and reach loopback or private HTTP services that the default deny-list is intended to block. This crosses a real security boundary because an external caller can force the server to make outbound requests to internal-only targets. This vulnerability is fixed in 8.31.0.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

1.59%

Chance of exploitation in the next 30 days

Percentile

76%

Versus all other CVEs

30-day change

Decrease -0.18 pp

From 1.77% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • githubUnverified

    Gotenberg

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Github.com/gotenberg/gotenberg2 products
  • v7All versions (No fix recorded)
  • v8< 8.32.0
Gotenberg1 product
Thecodingmachine1 product

3 vendors · 4 products

References

3 links