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CVE-2026-42590— Gotenberg: ExifTool group-prefix syntax bypasses dangerous-tag blocklist

Quick assessment

Affected
gotenberg gotenberg
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Gotenberg是Gotenberg开源的一个开发人员友好的 API。用于将多种文档格式转换为 PDF 文件。 Gotenberg 8.30.0之前版本存在安全漏洞，该漏洞源于ExifTool元数据写入黑名单可被绕过，允许攻击者利用组前缀语法实现任意文件重命名、移动、硬链接和符号链接创建。

CVSS 8.2 · High EPSS 0.29% · P22

Possible ATT&CK Techniques 1 AI

T1564.001 · Hidden Files and Directories

Affected Version Matrix 1

VendorProduct Version RangeStatus
gotenberg gotenberg < 8.30.0 affected
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I. Basic Information for CVE-2026-42590

Vulnerability Information
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Vulnerability Title
Gotenberg: ExifTool group-prefix syntax bypasses dangerous-tag blocklist
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不完整的黑名单
Source: CVE Program / CVE List V5
Vulnerability Title
Gotenberg 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Gotenberg是Gotenberg开源的一个开发人员友好的 API。用于将多种文档格式转换为 PDF 文件。 Gotenberg 8.30.0之前版本存在安全漏洞，该漏洞源于ExifTool元数据写入黑名单可被绕过，允许攻击者利用组前缀语法实现任意文件重命名、移动、硬链接和符号链接创建。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
gotenberg gotenberg < 8.30.0 -

II. Public POCs for CVE-2026-42590

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III. Intelligence Information for CVE-2026-42590

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Vendor Advisories for CVE-2026-42590 (1)

Same Patch Batch · gotenberg · 2026-05-14 · 10 CVEs total

CVE-2026-42589 9.8 CRITICAL Gotenberg: Unauthenticated RCE via ExifTool Metadata Key Injection
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-2026-40893 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
Same vendor: gotenberg
Same weakness: CWE-184

V. Comments for CVE-2026-42590

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