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

CVSS 9.4 · Critical EPSS 0.07% · P21

Affected Version Matrix 1

VendorProductVersion RangeStatus
gotenberggotenberg< 8.31.0affected
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I. Basic Information for CVE-2026-42596

Vulnerability Information
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Vulnerability Title
Gotenberg: Unauthenticated SSRF via default deny-list bypass in downloadFrom and webhook
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
服务端请求伪造(SSRF)
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
gotenberggotenberg < 8.31.0 -

II. Public POCs for CVE-2026-42596

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III. Intelligence Information for CVE-2026-42596

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Same Patch Batch · gotenberg · 2026-05-14 · 10 CVEs total

CVE-2026-425899.8 CRITICALGotenberg: Unauthenticated RCE via ExifTool Metadata Key Injection
CVE-2026-425958.6 HIGHGotenberg: Server-Side Request Forgery via Chromium URL Endpoint with Redirect-Based Deny-
CVE-2026-425918.2 HIGHGotenberg: Server-Side Request Forgery (SSRF) in github.com/gotenberg/gotenberg/v8
CVE-2026-425908.2 HIGHGotenberg: ExifTool group-prefix syntax bypasses dangerous-tag blocklist
CVE-2026-408938.2 HIGHGotenberg: ExifTool Dangerous Tag Blocklist Bypass via Group-Prefixed Tag Names Allows Arb
CVE-2026-425947.5 HIGHGotenberg: Unauthenticated denial of service via echo.Context pool reuse in webhook async
CVE-2026-425975.9 MEDIUMGotenberg: Chromium URL conversion routes read arbitrary files under /tmp via file:// sche
CVE-2026-425935.3 MEDIUMGotenberg: Arbitrary PDF read via stampExpression and watermarkExpression in merge, split,
CVE-2026-425925.3 MEDIUMGotenberg: DNS rebinding bypasses SSRF validation on Chromium URL conversion routes

IV. Related Vulnerabilities

Same product: gotenberg
Same vendor: gotenberg
Same weakness: CWE-918

V. Comments for CVE-2026-42596

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