Vulnerability details
CVE-2026-42596
gotenberg gotenberg
Gotenberg: Unauthenticated SSRF via default deny-list bypass in downloadFrom and webhook
CVSS 3.1
9.4Critical
Official 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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.4Critical | 3.1 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| gotenberg | gotenberg | < 8.31.0 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://github.com/gotenberg/gotenberg/security/advisories/GHSA-4vmc-gm8v-m35h x_refsource_CONFIRM
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Details
- Published
- 2026-05-14
- Last updated
- 2026-05-15
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
1.58%
Probability of exploitation in 30 days
75.7%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Proof of concept
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-918Server-Side Request Forgery (SSRF)