Vulnerability-Lookup

GHSA-88F2-FPV8-89Q2

Vulnerability from github – Published: 2026-09-03 19:06 – Updated: 2026-09-03 19:06

Summary

Orval: RCE via servers[].url -> unescaped request-URL template literal (with getBaseUrlFromSpecification)

Details

Summary

When Orval is configured with output.baseUrl.getBaseUrlFromSpecification: true, it bakes the spec's servers[0].url into the generated request URL as a template literal without escaping the backtick. A server URL containing a backtick closes the template literal and injects a concatenation expression evaluated when the generated URL/request function is called, executing attacker-controlled code. Verified on Orval 8.19.0 (fetch client); survives default OpenAPI validation.

Details

return `http://api.x/` + (globalThis.X = require("fs").writeFileSync("/marker","pwned")) + `/v1/u`;

Prerequisite: the documented getBaseUrlFromSpecification: true option (takes the base URL from the OpenAPI servers block). This is the same output sink as the route-path case (request-URL template literal) reached via the server url field. Distinct from Orval's published CVEs (CVE-2026-22785 summary/MCP, CVE-2026-23947 / CVE-2026-25141 x-enumDescriptions, CVE-2026-24132 const/mock).

PoC

reproduce.sh (+ make_spec.py) attached: generates a fetch client with getBaseUrlFromSpecification: true, bundles it, calls the functions, and shows a marker written. Verified on 8.19.0.

Impact

With that option enabled, code execution in any environment that calls a client generated from an attacker-controlled or attacker-influenced OpenAPI description.

Suggested fix

Escape the server URL before emitting it into the URL template literal (escape backtick and ${), or build the base URL with an encoder that treats it as data; validate the URL. maintainer-report.txt make_spec.py reproduce.sh

Severity

9.3 (Critical)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "orval"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.21.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-62682"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94",
      "CWE-116",
      "CWE-1336"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-03T19:06:52Z",
    "nvd_published_at": "2026-08-19T18:16:54Z",
    "severity": "CRITICAL"
  },
  "details": "### Summary\n\nWhen Orval is configured with `output.baseUrl.getBaseUrlFromSpecification: true`, it bakes the spec\u0027s `servers[0].url` into the generated request URL as a template literal without escaping the backtick. A server URL containing a backtick closes the template literal and injects a concatenation expression evaluated when the generated URL/request function is called, executing attacker-controlled code. Verified on Orval 8.19.0 (fetch client); survives default OpenAPI validation.\n\n### Details\n\n```ts\nreturn `http://api.x/` + (globalThis.X = require(\"fs\").writeFileSync(\"/marker\",\"pwned\")) + `/v1/u`;\n```\n\nPrerequisite: the documented `getBaseUrlFromSpecification: true` option (takes the base URL from the OpenAPI servers block). This is the same output sink as the route-path case (request-URL template literal) reached via the server `url` field. Distinct from Orval\u0027s published CVEs (CVE-2026-22785 summary/MCP, CVE-2026-23947 / CVE-2026-25141 x-enumDescriptions, CVE-2026-24132 const/mock).\n\n### PoC\n\n`reproduce.sh` (+ `make_spec.py`) attached: generates a fetch client with `getBaseUrlFromSpecification: true`, bundles it, calls the functions, and shows a marker written. Verified on 8.19.0.\n\n### Impact\n\nWith that option enabled, code execution in any environment that calls a client generated from an attacker-controlled or attacker-influenced OpenAPI description.\n\n### Suggested fix\n\nEscape the server URL before emitting it into the URL template literal (escape backtick and `${`), or build the base URL with an encoder that treats it as data; validate the URL.\n[maintainer-report.txt](https://github.com/user-attachments/files/29396562/maintainer-report.txt)\n[make_spec.py](https://github.com/user-attachments/files/29396563/make_spec.py)\n[reproduce.sh](https://github.com/user-attachments/files/29396564/reproduce.sh)",
  "id": "GHSA-88f2-fpv8-89q2",
  "modified": "2026-09-03T19:06:52Z",
  "published": "2026-09-03T19:06:52Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/orval-labs/orval/security/advisories/GHSA-88f2-fpv8-89q2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-62682"
    },
    {
      "type": "WEB",
      "url": "https://github.com/orval-labs/orval/pull/3692"
    },
    {
      "type": "WEB",
      "url": "https://github.com/orval-labs/orval/commit/8ef1bfdf3f9bcaf9dabfbe2e42887f1c0e159ab6"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/orval-labs/orval"
    },
    {
      "type": "WEB",
      "url": "https://github.com/orval-labs/orval/releases/tag/v8.21.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Orval: RCE via servers[].url -\u003e unescaped request-URL template literal (with getBaseUrlFromSpecification)"
}

CVE-2026-62682 (GCVE-0-2026-62682)

Vulnerability from cvelistv5 – Published: 2026-08-19 17:40 – Updated: 2026-08-19 18:19

Title

Orval: RCE via servers[].url -> unescaped request-URL template literal (with getBaseUrlFromSpecification)

Summary

Orval generates type-safe JavaScript clients in TypeScript from OpenAPI v3 and Swagger v2 specifications. Prior to 8.21.0, an unescaped backtick in servers[0].url is emitted into request URL template literals generated when output.baseUrl.getBaseUrlFromSpecification is enabled without safe encoding. This permits attacker-controlled JavaScript to be evaluated when a generated request or URL-builder function is called, resulting in code execution in the developer, CI, test, or application environment. The affected code is packages/core/src/getters/route.ts function getFullRoute. This issue is fixed in version 8.21.0.

Severity

9.3 (Critical)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-19 18:18 UTC

CWE

CWE-94 - Improper Control of Generation of Code ('Code Injection')
CWE-116 - Improper Encoding or Escaping of Output
CWE-1336 - Improper Neutralization of Special Elements Used in a Template Engine

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/orval-labs/orval/security/advi…	x_refsource_CONFIRM
https://github.com/orval-labs/orval/pull/3692	x_refsource_MISC
https://github.com/orval-labs/orval/commit/8ef1bf…	x_refsource_MISC
https://github.com/orval-labs/orval/releases/tag/…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
orval-labs	orval	Affected: < 8.21.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-62682",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-19T18:18:29.754822Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-19T18:19:27.462Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/orval-labs/orval/security/advisories/GHSA-88f2-fpv8-89q2"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "orval",
          "vendor": "orval-labs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 8.21.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Orval generates type-safe JavaScript clients in TypeScript from OpenAPI v3 and Swagger v2 specifications. Prior to 8.21.0, an unescaped backtick in servers[0].url is emitted into request URL template literals generated when output.baseUrl.getBaseUrlFromSpecification is enabled without safe encoding. This permits attacker-controlled JavaScript to be evaluated when a generated request or URL-builder function is called, resulting in code execution in the developer, CI, test, or application environment. The affected code is packages/core/src/getters/route.ts function getFullRoute. This issue is fixed in version 8.21.0."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-94",
              "description": "CWE-94: Improper Control of Generation of Code (\u0027Code Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-116",
              "description": "CWE-116: Improper Encoding or Escaping of Output",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-1336",
              "description": "CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T17:40:17.061Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/orval-labs/orval/security/advisories/GHSA-88f2-fpv8-89q2",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/orval-labs/orval/security/advisories/GHSA-88f2-fpv8-89q2"
        },
        {
          "name": "https://github.com/orval-labs/orval/pull/3692",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/orval-labs/orval/pull/3692"
        },
        {
          "name": "https://github.com/orval-labs/orval/commit/8ef1bfdf3f9bcaf9dabfbe2e42887f1c0e159ab6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/orval-labs/orval/commit/8ef1bfdf3f9bcaf9dabfbe2e42887f1c0e159ab6"
        },
        {
          "name": "https://github.com/orval-labs/orval/releases/tag/v8.21.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/orval-labs/orval/releases/tag/v8.21.0"
        }
      ],
      "source": {
        "advisory": "GHSA-88f2-fpv8-89q2",
        "discovery": "UNKNOWN"
      },
      "title": "Orval: RCE via servers[].url -\u003e unescaped request-URL template literal (with getBaseUrlFromSpecification)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-62682",
    "datePublished": "2026-08-19T17:40:17.061Z",
    "dateReserved": "2026-07-14T20:22:04.395Z",
    "dateUpdated": "2026-08-19T18:19:27.462Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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.

Action not permitted

GHSA-88F2-FPV8-89Q2

Summary

Details

PoC

Impact

Suggested fix

CVE-2026-62682 (GCVE-0-2026-62682)

Tags

Sightings

Nomenclature