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CVE-2026-42592— Gotenberg: DNS rebinding bypasses SSRF validation on Chromium URL conversion routes

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 8.32.0之前版本存在安全漏洞，该漏洞源于FilterOutboundURL DNS解析与Chromium DNS解析存在时间窗口，允许攻击者通过DNS重绑定绕过私有地址拒绝列表，访问内部服务。

CVSS 5.3 · Medium EPSS 0.25% · P15

Affected Version Matrix 1

VendorProduct Version RangeStatus
gotenberg gotenberg < 8.32.0 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
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 8.32.0之前版本存在安全漏洞，该漏洞源于FilterOutboundURL DNS解析与Chromium DNS解析存在时间窗口，允许攻击者通过DNS重绑定绕过私有地址拒绝列表，访问内部服务。
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 < 8.32.0 -

II. Public POCs for CVE-2026-42592

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III. Intelligence Information for CVE-2026-42592

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Vendor Advisories for CVE-2026-42592 (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-2026-42590 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
Same vendor: gotenberg
Same weakness: CWE-367

V. Comments for CVE-2026-42592

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