CVE-2026-42592— Gotenberg: DNS rebinding bypasses SSRF validation on Chromium URL conversion routes
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I. Basic Information for CVE-2026-42592
Vulnerability Information
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Vulnerability Title
Gotenberg: DNS rebinding bypasses SSRF validation on Chromium URL conversion routes
Source: NVD (National Vulnerability Database)
Vulnerability Description
Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.32.0, FilterOutboundURL resolves the hostname, checks the resolved IPs against the private-address deny-list, and returns only the error. It discards the resolved addresses. Chromium later performs its own DNS resolution when it navigates to the URL. An attacker who controls DNS for a hostname with a short TTL returns a public IP on the first query (Gotenberg allows) and a private IP on the second query (Chromium connects to the attacker-chosen internal address). The CDP Fetch.requestPaused handler re-checks the URL but runs its own DNS resolution, leaving a timing window before Chromium's actual TCP connect. The rendered internal service response returns to the caller as a PDF. This vulnerability is fixed in 8.32.0.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: NVD (National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-42592
| # | POC Description | Source Link | Shenlong Link |
|---|
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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-2026-42590 | 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, |
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-367
V. Comments for CVE-2026-42592
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