Gotenberg up to 8.32.0 Filename context.go filepath.Base path traversal

Summaryinfo

A vulnerability, which was classified as very critical, was found in Gotenberg up to 8.32.0. This impacts the function filepath.Base of the file pkg/modules/api/context.go of the component Filename Handler. Executing a manipulation can lead to path traversal. The identification of this vulnerability is CVE-2026-44829. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as very critical was found in Gotenberg up to 8.32.0. This vulnerability affects the function filepath.Base of the file pkg/modules/api/context.go of the component Filename Handler. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-23. The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Gotenberg is a Docker-powered stateless API for PDF files. In 8.32.0 and earlier, filename handling in pkg/modules/api/context.go uses filepath.Base on Linux, which does not treat backslashes as path separators, so a multipart filename containing Windows-style parent directory components survives sanitization. The original filename flows through ctx.diskToOriginal and the multi-output PDF routes into archives.FilesFromDisk and archives.Zip.Archive as the generated zip entry name. A remote attacker can submit a name such as ........\Windows\System32\evil.pdf through an upload or an upstream downloadFrom Content-Disposition header, and a Windows archive extractor can write the resulting file outside the intended extraction directory. The affected paths include /forms/pdfengines/split and other multi-output PDF, LibreOffice, and conversion routes, and exploitation can cause arbitrary file writes on a downstream Windows system when a user or process extracts the returned archive. This issue is fixed in version 8.33.0.

The advisory is available at github.com. This vulnerability was named CVE-2026-44829 since 05/07/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/19/2026). This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 8.33.0 eliminates this vulnerability.

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Productinfo

Name

• Gotenberg

Version

• 8.0
• 8.1
• 8.2
• 8.3
• 8.4
• 8.5
• 8.6
• 8.7
• 8.8
• 8.9
• 8.10
• 8.11
• 8.12
• 8.13
• 8.14
• 8.15
• 8.16
• 8.17
• 8.18
• 8.19
• 8.20
• 8.21
• 8.22
• 8.23
• 8.24
• 8.25
• 8.26
• 8.27
• 8.28
• 8.29
• 8.30
• 8.31
• 8.32.0

Website

• Product: https://github.com/gotenberg/gotenberg/

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