CVE-2026-82732 (GCVE-0-2026-82732)

Vulnerability from cvelistv5 – Published: 2026-09-01 02:09 – Updated: 2026-09-01 14:55
VLAI
Title
Declared argument constraints not enforced on AshTypescript typed controller routes
Summary
Improper Input Validation vulnerability in ash-project ash_typescript allows a remote attacker to submit argument values outside a declared allowlist or bound on typed-controller routes. AshTypescript.TypedController.RequestHandler in lib/ash_typescript/typed_controller/request_handler.ex calls Ash.Type.cast_input/3 and treats an {:ok, cast} result as fully validated. In Ash these are separate steps: cast_input/3 only coerces the term, while every constraint declared on the argument is applied by Ash.Type.apply_constraints/3, which this path never calls. Constraints such as one_of, max_length, min and max, and match are therefore inert, so a value outside a declared allowlist is accepted and passed to the route handler. Codegen renders the same constraints into the generated TypeScript types, so an allowlist appears enforced to a TypeScript caller while any other HTTP client ignores it. Empty-string to nil normalization also lives in apply_constraints, so the allow_nil?: false check accepts "" for a required argument. Where a constraint gates a role, a status, or a sort direction, this becomes a privilege or state-machine bypass. This issue affects ash_typescript: from 0.15.0 before 0.18.0.
Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-01 14:54 UTC
CWE
  • CWE-20 - Improper Input Validation
Assigner
EEF CNA under the mitre root
CNA scorecard A 97/100 over 314 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
ash-project ash_typescript Affected: 0.15.0 , < 0.18.0 (semver)
    cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*
Create a notification for this product.
ash-project ash_typescript Affected: 546a15e1a2d7dbf1df2d5a6ee4404bc3da87852e , < 21ab6f1229a4dccdb56bc37ed437d9672a0c4a4e (git)
    cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Peter Ullrich Peter Ullrich Torkild Gundersen Kjevik / Ash Project Jonatan Männchen / EEF
Show details on NVD website
To clipboard 

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                    "role": "CISA Coordinator",
                    "timestamp": "2026-09-01T14:54:31.577510Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-09-01T14:54:45.893Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "references": [
              {
                "tags": [
                  "exploit"
                ],
                "url": "https://github.com/ash-project/ash_typescript/security/advisories/GHSA-f7fq-hwq6-jhvv"
              }
            ],
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "collectionURL": "https://repo.hex.pm",
              "cpes": [
                "cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*"
              ],
              "defaultStatus": "unaffected",
              "modules": [
                "\u0027Elixir.AshTypescript.TypedController.RequestHandler\u0027"
              ],
              "packageName": "ash_typescript",
              "packageURL": "pkg:hex/ash_typescript",
              "product": "ash_typescript",
              "programFiles": [
                "lib/ash_typescript/typed_controller/request_handler.ex"
              ],
              "programRoutines": [
                {
                  "name": "\u0027Elixir.AshTypescript.TypedController.RequestHandler\u0027:cast_arguments/2"
                },
                {
                  "name": "\u0027Elixir.AshTypescript.TypedController.RequestHandler\u0027:handle/4"
                }
              ],
              "repo": "https://github.com/ash-project/ash_typescript",
              "vendor": "ash-project",
              "versions": [
                {
                  "lessThan": "0.18.0",
                  "status": "affected",
                  "version": "0.15.0",
                  "versionType": "semver"
                }
              ]
            },
            {
              "collectionURL": "https://github.com",
              "cpes": [
                "cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*"
              ],
              "defaultStatus": "unaffected",
              "modules": [
                "\u0027Elixir.AshTypescript.TypedController.RequestHandler\u0027"
              ],
              "packageName": "ash-project/ash_typescript",
              "packageURL": "pkg:github/ash-project/ash_typescript",
              "product": "ash_typescript",
              "programFiles": [
                "lib/ash_typescript/typed_controller/request_handler.ex"
              ],
              "programRoutines": [
                {
                  "name": "\u0027Elixir.AshTypescript.TypedController.RequestHandler\u0027:cast_arguments/2"
                },
                {
                  "name": "\u0027Elixir.AshTypescript.TypedController.RequestHandler\u0027:handle/4"
                }
              ],
              "repo": "https://github.com/ash-project/ash_typescript",
              "vendor": "ash-project",
              "versions": [
                {
                  "lessThan": "21ab6f1229a4dccdb56bc37ed437d9672a0c4a4e",
                  "status": "affected",
                  "version": "546a15e1a2d7dbf1df2d5a6ee4404bc3da87852e",
                  "versionType": "git"
                }
              ]
            }
          ],
          "configurations": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "\u003cp\u003eThe application exposes an AshTypescript typed controller over HTTP with at least one route argument carrying a \u003ccode\u003econstraints\u003c/code\u003e declaration that gates application behaviour.\u003c/p\u003e"
                },
                {
                  "base64": false,
                  "type": "text/markdown",
                  "value": "The application exposes an AshTypescript typed controller over HTTP with at least one route argument carrying a `constraints` declaration that gates application behaviour."
                }
              ],
              "value": "The application exposes an AshTypescript typed controller over HTTP with at least one route argument carrying a constraints declaration that gates application behaviour."
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "0.18.0",
                      "versionStartIncluding": "0.15.0",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ],
              "operator": "AND"
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "finder",
              "value": "Peter Ullrich"
            },
            {
              "lang": "en",
              "type": "reporter",
              "value": "Peter Ullrich"
            },
            {
              "lang": "en",
              "type": "remediation developer",
              "value": "Torkild Gundersen Kjevik / Ash Project"
            },
            {
              "lang": "en",
              "type": "coordinator",
              "value": "Jonatan M\u00e4nnchen / EEF"
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "\u003cp\u003eImproper Input Validation vulnerability in ash-project ash_typescript allows a remote attacker to submit argument values outside a declared allowlist or bound on typed-controller routes.\u003c/p\u003e\n\u003cp\u003e\u003ccode\u003eAshTypescript.TypedController.RequestHandler\u003c/code\u003e in \u003ccode\u003elib/ash_typescript/typed_controller/request_handler.ex\u003c/code\u003e calls \u003ccode\u003eAsh.Type.cast_input/3\u003c/code\u003e and treats an \u003ccode\u003e{:ok, cast}\u003c/code\u003e result as fully validated. In Ash these are separate steps: \u003ccode\u003ecast_input/3\u003c/code\u003e only coerces the term, while every constraint declared on the argument is applied by \u003ccode\u003eAsh.Type.apply_constraints/3\u003c/code\u003e, which this path never calls. Constraints such as \u003ccode\u003eone_of\u003c/code\u003e, \u003ccode\u003emax_length\u003c/code\u003e, \u003ccode\u003emin\u003c/code\u003e and \u003ccode\u003emax\u003c/code\u003e, and \u003ccode\u003ematch\u003c/code\u003e are therefore inert, so a value outside a declared allowlist is accepted and passed to the route handler. Codegen renders the same constraints into the generated TypeScript types, so an allowlist appears enforced to a TypeScript caller while any other HTTP client ignores it. Empty-string to \u003ccode\u003enil\u003c/code\u003e normalization also lives in \u003ccode\u003eapply_constraints\u003c/code\u003e, so the \u003ccode\u003eallow_nil?: false\u003c/code\u003e check accepts \u003ccode\u003e\"\"\u003c/code\u003e for a required argument.\u003c/p\u003e\n\u003cp\u003eWhere a constraint gates a role, a status, or a sort direction, this becomes a privilege or state-machine bypass.\u003c/p\u003e\n\u003cp\u003eThis issue affects ash_typescript: from 0.15.0 before 0.18.0.\u003c/p\u003e"
                },
                {
                  "base64": false,
                  "type": "text/markdown",
                  "value": "Improper Input Validation vulnerability in ash-project ash_typescript allows a remote attacker to submit argument values outside a declared allowlist or bound on typed-controller routes.\n\n`AshTypescript.TypedController.RequestHandler` in `lib/ash_typescript/typed_controller/request_handler.ex` calls `Ash.Type.cast_input/3` and treats an `{:ok, cast}` result as fully validated. In Ash these are separate steps: `cast_input/3` only coerces the term, while every constraint declared on the argument is applied by `Ash.Type.apply_constraints/3`, which this path never calls. Constraints such as `one_of`, `max_length`, `min` and `max`, and `match` are therefore inert, so a value outside a declared allowlist is accepted and passed to the route handler. Codegen renders the same constraints into the generated TypeScript types, so an allowlist appears enforced to a TypeScript caller while any other HTTP client ignores it. Empty-string to `nil` normalization also lives in `apply_constraints`, so the `allow_nil?: false` check accepts `\"\"` for a required argument.\n\nWhere a constraint gates a role, a status, or a sort direction, this becomes a privilege or state-machine bypass.\n\nThis issue affects ash_typescript: from 0.15.0 before 0.18.0."
                }
              ],
              "value": "Improper Input Validation vulnerability in ash-project ash_typescript allows a remote attacker to submit argument values outside a declared allowlist or bound on typed-controller routes.\n\nAshTypescript.TypedController.RequestHandler in lib/ash_typescript/typed_controller/request_handler.ex calls Ash.Type.cast_input/3 and treats an {:ok, cast} result as fully validated. In Ash these are separate steps: cast_input/3 only coerces the term, while every constraint declared on the argument is applied by Ash.Type.apply_constraints/3, which this path never calls. Constraints such as one_of, max_length, min and max, and match are therefore inert, so a value outside a declared allowlist is accepted and passed to the route handler. Codegen renders the same constraints into the generated TypeScript types, so an allowlist appears enforced to a TypeScript caller while any other HTTP client ignores it. Empty-string to nil normalization also lives in apply_constraints, so the allow_nil?: false check accepts \"\" for a required argument.\n\nWhere a constraint gates a role, a status, or a sort direction, this becomes a privilege or state-machine bypass.\n\nThis issue affects ash_typescript: from 0.15.0 before 0.18.0."
            }
          ],
          "impacts": [
            {
              "capecId": "CAPEC-153",
              "descriptions": [
                {
                  "lang": "en",
                  "value": "CAPEC-153 Input Data Manipulation"
                }
              ]
            }
          ],
          "metrics": [
            {
              "cvssV4_0": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "PRESENT",
                "attackVector": "NETWORK",
                "baseScore": 6.3,
                "baseSeverity": "MEDIUM",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
                "version": "4.0",
                "vulnAvailabilityImpact": "NONE",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "LOW",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-20",
                  "description": "CWE-20 Improper Input Validation",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-09-01T02:09:15.070Z",
            "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
            "shortName": "EEF"
          },
          "references": [
            {
              "tags": [
                "related",
                "vendor-advisory"
              ],
              "url": "https://github.com/ash-project/ash_typescript/security/advisories/GHSA-f7fq-hwq6-jhvv"
            },
            {
              "tags": [
                "related"
              ],
              "url": "https://cna.erlef.org/cves/CVE-2026-82732.html"
            },
            {
              "tags": [
                "related"
              ],
              "url": "https://osv.dev/vulnerability/EEF-CVE-2026-82732"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/ash-project/ash_typescript/commit/21ab6f1229a4dccdb56bc37ed437d9672a0c4a4e"
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "Declared argument constraints not enforced on AshTypescript typed controller routes"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "assignerShortName": "EEF",
        "cveId": "CVE-2026-82732",
        "datePublished": "2026-09-01T02:09:15.070Z",
        "dateReserved": "2026-08-31T00:59:10.001Z",
        "dateUpdated": "2026-09-01T14:55:02.304Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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