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CVE-2026-42594— Gotenberg: Unauthenticated denial of service via echo.Context pool reuse in webhook async goroutine

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之前版本存在竞争条件问题漏洞，该漏洞源于webhook中间件在上下文回收后使用未检查的类型断言，导致空指针恐慌，造成进程崩溃。

CVSS 7.5 · High EPSS 0.38% · P29

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
gotenberg gotenberg < 8.32.0 affected
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I. Basic Information for CVE-2026-42594

Vulnerability Information
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Vulnerability Title
Gotenberg: Unauthenticated denial of service via echo.Context pool reuse in webhook async goroutine
Source: CVE Program / CVE List V5
Vulnerability Description
Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.32.0, the webhook middleware spawns a goroutine that holds a reference to the request's echo.Context after the synchronous handler returns ErrAsyncProcess and Echo recycles the context back to its sync.Pool. When a concurrent request claims the recycled context, c.Reset() clears the store. If the webhook goroutine reaches hardTimeoutMiddleware at that moment, an unchecked type assertion on a nil store entry panics outside any recover() scope, crashing the Gotenberg process. Any anonymous caller reaches the webhook path (default webhook-deny-list filters only the webhook destination, not the submitter). A single-source stress of ~24 webhook requests plus ~60 GET /version requests crashes the process in about two seconds. 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:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Vulnerability Title
Gotenberg 竞争条件问题漏洞
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之前版本存在竞争条件问题漏洞，该漏洞源于webhook中间件在上下文回收后使用未检查的类型断言，导致空指针恐慌，造成进程崩溃。
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-2026-42594

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III. Intelligence Information for CVE-2026-42594

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Vendor Advisories for CVE-2026-42594 (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-2026-42597 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-362

V. Comments for CVE-2026-42594

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