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    CVE-2026-40280

    Gotenberg is an API-based document conversion tool. In versions 8.30.1 and earlier, the default private-IP deny-lists for the --webhook-deny-list and --api-download-from-deny-list flags use a case-sensitive regular expression (^https?://) to match URL schemes. Because Go's net/url.Parse() normalizes the scheme to lowercase before establishing the outbound TCP connection, an attacker can bypass the deny-list by simply capitalizing part of the URL scheme (e.g., HTTP://, HTTPS://, or Http://). This allows unauthenticated requests to reach internal network services, including private IP ranges, loopback addresses, and cloud instance metadata endpoints such as HTTP://169.254.169.254/latest/meta-data/. This bypasses the same security control that was patched in CVE-2026-27018. This issue has been fixed in version 8.31.0.

    Published:May 5, 2026
    Last Modified:May 8, 2026
    EPS:May 5, 2026
    EPSS Score:0.00039
    CVSS Score:7.5

    Affected Products

    Vendor
    Gotenberg
    Product
    Gotenberg
    Vendor
    Thecodingmachine
    Product
    Gotenberg

    Exploits

    https://github.com/gotenberg/gotenberg/security/advisories/GHSA-5q7p-7jgv-ww56https://github.com/gotenberg/gotenberg/security/advisories/GHSA-5q7p-7jgv-ww56

    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