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    CVE-2026-42590

    Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.30.0, The ExifTool metadata write blocklist in Gotenberg can be bypassed using ExifTool's group-prefix syntax, enabling arbitrary file rename, move, hardlink, and symlink creation on the server. ExifTool supports group-prefix syntax where File:FileName is processed identically to FileName -- the prefix is stripped by SetNewValue in Writer.pl before tag matching. The safeKeyPattern regex (^[a-zA-Z0-9\-_.:]+$) allows colons, so prefixed tag names pass validation. Any prefix works: File:FileName, System:Directory, a:HardLink, etc. Additionally, FilePermissions, FileUserID, and FileGroupID pseudo-tags are not blocked at all and can modify file attributes without any prefix. This vulnerability is fixed in 8.30.0.

    Published:May 14, 2026
    Last Modified:May 18, 2026
    EPS:May 14, 2026
    EPSS Score:0.00052
    CVSS Score:8.2

    Affected Products

    Vendor
    Gotenberg
    Product
    Gotenberg
    Vendor
    Thecodingmachine
    Product
    Gotenberg

    Exploits

    https://github.com/gotenberg/gotenberg/security/advisories/GHSA-7v3r-m9c8-r855https://github.com/gotenberg/gotenberg/security/advisories/GHSA-7v3r-m9c8-r855

    Related CVEs

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    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