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    CVE-2026-42596

    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.

    Published:May 14, 2026
    Last Modified:May 18, 2026
    EPS:May 14, 2026
    EPSS Score:0.00064
    CVSS Score:9.4

    Affected Products

    Vendor
    Gotenberg
    Product
    Gotenberg
    Vendor
    Thecodingmachine
    Product
    Gotenberg

    Exploits

    https://github.com/gotenberg/gotenberg/security/advisories/GHSA-4vmc-gm8v-m35hhttps://github.com/gotenberg/gotenberg/security/advisories/GHSA-4vmc-gm8v-m35h

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-664 Server Side Request Forgery

    Related CVEs

    CVE-2026-44829 (CVSS 8.8) — Gotenberg is a Docker-powered stateless API for PDF files. In 8.32.0 and earlier, filename handling in pkg/mod…
    CVE-2026-45742 (CVSS 7.5) — Gotenberg is a Docker-powered stateless API for PDF files. From 8.10.0 until 8.33.0, the newContext function i…
    CVE-2026-45741 (CVSS 7.5) — Gotenberg is a Docker-powered stateless API for PDF files. In 8.32.0 and earlier, the IsPublicIP function in p…
    CVE-2026-55229 (CVSS 7.5) — Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.34.0, Gotenberg's /forms/libreoffice/con…
    CVE-2026-42590 (CVSS 8.2) — Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.30.0, The ExifTool metadata write blockl…
    CVE-2026-42597 (CVSS 5.9) — Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.32.0, the /forms/chromium/convert/url an…
    CVE-2026-42595 (CVSS 8.6) — Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.32.0, Gotenberg's Chromium URL-to-PDF en…
    CVE-2026-42594 (CVSS 7.5) — Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.32.0, the webhook middleware spawns a go…
    CVE-2026-42593 (CVSS 5.3) — Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.32.0, pdfengines/merge, pdfengines/split…
    CVE-2026-42592 (CVSS 5.3) — Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.32.0, FilterOutboundURL resolves the hos…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High