CVE-2026-42589— Gotenberg: Unauthenticated RCE via ExifTool Metadata Key Injection
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I. Basic Information for CVE-2026-42589
Vulnerability Information
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Vulnerability Title
Gotenberg: Unauthenticated RCE via ExifTool Metadata Key Injection
Source: NVD (National Vulnerability Database)
Vulnerability Description
Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.31.0, Gotenberg's /forms/pdfengines/metadata/write HTTP endpoint accepts a JSON metadata object and passes its keys directly to ExifTool via the go-exiftool library. No validation is performed on key characters. A \n embedded in a JSON key splits the ExifTool stdin stream into a new argument line, allowing an attacker to inject arbitrary ExifTool flags — including -if, which evaluates Perl expressions. This achieves unauthenticated OS command execution in a single HTTP request. The response is HTTP 200 with a valid PDF, making the attack transparent to basic monitoring. This vulnerability is fixed in 8.31.0.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: NVD (National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-42589
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Same Patch Batch · gotenberg · 2026-05-14 · 10 CVEs total
| CVE-2026-42596 | 9.4 CRITICAL | Gotenberg: Unauthenticated SSRF via default deny-list bypass in downloadFrom and webhook |
| CVE-2026-42595 | 8.6 HIGH | Gotenberg: Server-Side Request Forgery via Chromium URL Endpoint with Redirect-Based Deny- |
| CVE-2026-42591 | 8.2 HIGH | Gotenberg: Server-Side Request Forgery (SSRF) in github.com/gotenberg/gotenberg/v8 |
| CVE-2026-42590 | 8.2 HIGH | Gotenberg: ExifTool group-prefix syntax bypasses dangerous-tag blocklist |
| CVE-2026-40893 | 8.2 HIGH | Gotenberg: ExifTool Dangerous Tag Blocklist Bypass via Group-Prefixed Tag Names Allows Arb |
| CVE-2026-42594 | 7.5 HIGH | Gotenberg: Unauthenticated denial of service via echo.Context pool reuse in webhook async |
| CVE-2026-42597 | 5.9 MEDIUM | Gotenberg: Chromium URL conversion routes read arbitrary files under /tmp via file:// sche |
| CVE-2026-42593 | 5.3 MEDIUM | Gotenberg: Arbitrary PDF read via stampExpression and watermarkExpression in merge, split, |
| CVE-2026-42592 | 5.3 MEDIUM | Gotenberg: DNS rebinding bypasses SSRF validation on Chromium URL conversion routes |
IV. Related Vulnerabilities
Same product: gotenberg
- CVE-2026-42590
Gotenberg: ExifTool group-prefix syntax bypasses dangerous-t - CVE-2026-42597
Gotenberg: Chromium URL conversion routes read arbitrary fil - CVE-2026-42595
Gotenberg: Server-Side Request Forgery via Chromium URL Endp - CVE-2026-42594
Gotenberg: Unauthenticated denial of service via echo.Contex - CVE-2026-42593
Gotenberg: Arbitrary PDF read via stampExpression and waterm
Same vendor: gotenberg
- CVE-2026-42590
Gotenberg: ExifTool group-prefix syntax bypasses dangerous-t - CVE-2026-42597
Gotenberg: Chromium URL conversion routes read arbitrary fil - CVE-2026-42595
Gotenberg: Server-Side Request Forgery via Chromium URL Endp - CVE-2026-42594
Gotenberg: Unauthenticated denial of service via echo.Contex - CVE-2026-42593
Gotenberg: Arbitrary PDF read via stampExpression and waterm
Same weakness: CWE-78
V. Comments for CVE-2026-42589
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