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Gotenberg: Unauthenticated denial of service via echo.Context pool reuse in webhook async goroutine

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-42594
Confirmed fixed CVEs
Not specified
Updated in this feed
6 Nov 2026, 01:13 UTC · Revision 1

Source evidence

Gotenberg: Unauthenticated denial of service via echo.Context pool reuse in webhook async goroutine

core-osv · Original source

Published 14 May 2026, 15:32 UTC

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.

osv:CVE-2026-42594
Complete source record
{
  "id": "1b84f2ee26f6e196a4e38df41382a0c17522c90d9610e54e8eb95f3fcf5be5ae",
  "url": "https://osv.dev/vulnerability/CVE-2026-42594",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Gotenberg: Unauthenticated denial of service via echo.Context pool reuse in webhook async goroutine",
    "summary": "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.",
    "evidence": "osv:CVE-2026-42594",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-42594",
      "aliases": [
        "CVE-2026-42594",
        "GHSA-r33j-c622-r6qp",
        "GO-2026-5605"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/gotenberg/gotenberg",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
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                {
                  "fixed": "fe1b0020b8f211575559e6cf7e5ef6cc5a0545ca"
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              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
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                      {
                        "fixed": "8.32.0"
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                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:thecodingmachine:gotenberg:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
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                      {
                        "fixed": "8.32.0"
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                    "source": "CPE_RANGE"
                  }
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              }
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          ],
          "versions": [
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42594.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.708528635Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42594.json",
        "https://github.com/gotenberg/gotenberg/security/advisories/GHSA-r33j-c622-r6qp",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-42594"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-362"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42594.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-42594",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 513748,
  "published_at": "2026-05-14T15:32:32.308+00:00"
}