{"id":"CVE-2026-44829","aliases":["GHSA-hwc4-gmrw-5222","GO-2026-5443"],"url":"https://o3.security/vulnerability/CVE-2026-44829","summary":"Gotenberg: Path traversal in zip entry name via Windows-style separators in upload filename","details":"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.","published":"2026-08-19T14:35:06.966Z","modified":"2026-08-21T03:46:46.428269209Z","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L"},"epss":{"score":0.00377,"percentile":0.31025,"asOf":"2026-08-20"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/gotenberg/gotenberg/v8","fixedVersion":"8.33.0"}],"fix":{"url":"https://github.com/gotenberg/gotenberg/commit/93d0103585372433e18b351bb16edf4c383932d3","label":"gotenberg/gotenberg@93d0103"},"references":[{"type":"WEB","url":"https://github.com/gotenberg/gotenberg/releases/tag/v8.33.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44829.json"},{"type":"ADVISORY","url":"https://github.com/gotenberg/gotenberg/security/advisories/GHSA-hwc4-gmrw-5222"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44829"},{"type":"REPORT","url":"https://github.com/gotenberg/gotenberg/issues/662"},{"type":"FIX","url":"https://github.com/gotenberg/gotenberg/commit/93d0103585372433e18b351bb16edf4c383932d3"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-21T03:46:46.428269209Z"}}