CVE-2026-44829: Gotenberg path traversal via Windows-style separators in ZIP entry names

CVE-2026-44829 · Severity: high · CVSS 8.8 · Published 2026-08-19

Gotenberg, a tool for converting and manipulating documents, is vulnerable to a path traversal flaw when generating ZIP files. An attacker can provide a specially crafted filename that, when processed and returned in a ZIP archive, can cause files to be written to unintended locations on a Windows user's computer during extraction. This could lead to the overwriting of sensitive system files or the placement of malicious software if a user extracts the resulting archive.

Technologies: github.com/gotenberg/gotenberg/v7 (Go), github.com/gotenberg/gotenberg/v8 (Go), Gotenberg. Vendors: Go, Gotenberg.

Quick answers

Is CVE-2026-44829 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-44829 being exploited in the wild.
How severe is CVE-2026-44829?
High severity, with a CVSS score of 8.8, published 19 August 2026.
Which products and versions are affected?
github.com/gotenberg/gotenberg/v7 (Go) SEMVER:introduced=0; github.com/gotenberg/gotenberg/v8 (Go) <= 8.32.0, SEMVER:introduced=0,fixed=8.33.0; Gotenberg <= 8.32.0.
Is there a fix for CVE-2026-44829?
Yes. github.com/gotenberg/gotenberg/v8 (Go): upgrade to 8.33.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-44829 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-44829?
Check whether you run github.com/gotenberg/gotenberg/v7 (Go), github.com/gotenberg/gotenberg/v8 (Go) or Gotenberg at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/gotenberg/gotenberg/v8 (Go): upgrade to 8.33.0 or later
    go get github.com/gotenberg/gotenberg/v8@v8.33.0

Technical details

A path traversal vulnerability exists in Gotenberg due to improper sanitization of multipart filenames containing Windows-style backslash ('\') separators. Because Gotenberg typically runs in Linux containers, 'filepath.Base' fails to strip backslashes, allowing them to persist in the internal 'diskToOriginal' map. When Gotenberg generates a ZIP archive for multi-output routes (such as /split or /convert), these backslashes are included in the ZIP entry names. When a Windows user extracts this ZIP using standard tools (Windows Explorer, 7-Zip, WinRAR), the backslashes are interpreted as path separators, allowing files to be written outside the intended extraction directory. The vulnerability is patched in version 8.33.0.

Affected products

  • Gotenberg Gotenberg <= 8.32.0

Identifiers

  • CVE-2026-44829
  • GHSA-hwc4-gmrw-5222
  • GO-2026-5443

Timeline

  • 2026-05-29: advisory: GHSA-hwc4-gmrw-5222 published
  • 2026-05-29: patched: Version 8.33.0 released

References

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