Gotenberg: Path traversal in zip entry name via Windows-style separators in upload filename
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Low · High · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| gotenberg | gotenberg | before 8.33.0 | 8.33.0 | Patch available | CNA |
| — | github.com/gotenberg/gotenberg/v8 (Go) | before 8.33.0 | 8.33.0 | Patch available | GHSA-hwc4-gmrw-5222 |
- gotenberg Vendorgotenberg Affected before 8.33.0 Fixed in 8.33.0 Patch available CNA
- github.com/gotenberg/gotenberg/v8 (Go) Vendor— Affected before 8.33.0 Fixed in 8.33.0 Patch available GHSA-hwc4-gmrw-5222
Remediation
- Fix · CNA gotenberg (gotenberg) Fixed in 8.33.0
- Fix · GHSA-hwc4-gmrw-5222 github.com/gotenberg/gotenberg/v8 (Go) Fixed in 8.33.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-44829
- 2026-10-03 Alias added: GHSA-hwc4-gmrw-5222
References
Other 5
- https://github.com/gotenberg/gotenberg/security/advisories/GHSA-hwc4-gmrw-5222
- https://github.com/gotenberg/gotenberg/issues/662
- https://github.com/gotenberg/gotenberg/commit/93d0103585372433e18b351bb16edf4c383932d3
- https://github.com/gotenberg/gotenberg/releases/tag/v8.33.0
- https://github.com/gotenberg/gotenberg
More gotenberg vulnerabilities
- TI-2026-30869 Gotenberg: Unauthenticated RCE via ExifTool Metadata Key Injection CVSS 3.1CRITICAL 9.8
- TI-2026-29063 Gotenberg vulnerable to argument injection via newlines in ExifTool metadata values CVSS 3.1CRITICAL 10.0
- TI-2026-30876 Gotenberg: Unauthenticated SSRF via default deny-list bypass in downloadFrom and webhook CVSS 3.1CRITICAL 9.4
- TI-2026-27588 Gotenberg has a ReDoS via extraHttpHeaders scope feature CVSS 4.0HIGH 8.7
- TI-2026-30875 Gotenberg: Server-Side Request Forgery via Chromium URL Endpoint with Redirect-Based Deny-List Bypass CVSS 3.1HIGH 8.6
- TI-2026-30871 Gotenberg: Server-Side Request Forgery (SSRF) in github.com/gotenberg/gotenberg/v8 CVSS 3.1HIGH 8.2
Sources
- CVE-2026-44829 · CVE Program
- CVE-2026-44829 · NVD
- FIRST EPSS
- GHSA-hwc4-gmrw-5222 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences