{"cve":"CVE-2026-42590","nvd":{"published":"2026-05-14T16:16:22.010","modified":"2026-06-17T10:48:06.670","status":"Analyzed","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L","score":8.2},"cwes":["CWE-184"],"references":["https://github.com/gotenberg/gotenberg/security/advisories/GHSA-7v3r-m9c8-r855","https://github.com/gotenberg/gotenberg/security/advisories/GHSA-7v3r-m9c8-r855"],"products":["thecodingmachine:gotenberg"],"source":"nvd","synced_at":"2026-10-19T22:35:16.954578616+00:00"},"epss":{"cve":"CVE-2026-42590","score":0.0029,"percentile":0.21639,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-7v3r-m9c8-r855","url":"https://osv.dev/vulnerability/GHSA-7v3r-m9c8-r855","summary":"Gotenberg's ExifTool group-prefix syntax bypasses dangerous-tag blocklist","modified":"2026-07-21T13:51:55Z","packages":[{"ecosystem":"Go","name":"github.com/gotenberg/gotenberg/v8","purl":"pkg:golang/github.com/gotenberg/gotenberg/v8","ranges":["<=8.29.1"],"fixed":[]}]},{"id":"GO-2026-5234","url":"https://osv.dev/vulnerability/GO-2026-5234","summary":"Gotenberg's ExifTool group-prefix syntax bypasses dangerous-tag blocklist in github.com/gotenberg/gotenberg","modified":"2026-06-25T19:45:17.630672887Z","packages":[{"ecosystem":"Go","name":"github.com/gotenberg/gotenberg/v7","purl":"pkg:golang/github.com/gotenberg/gotenberg/v7","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/gotenberg/gotenberg/v8","purl":"pkg:golang/github.com/gotenberg/gotenberg/v8","ranges":["all versions"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}