CVE-2026-82732 (GCVE-0-2026-82732)
Vulnerability from cvelistv5 – Published: 2026-09-01 02:09 – Updated: 2026-09-01 14:55
VLAI
EPSS
VEX
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
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
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ash-project/ash_typescript/sec… | relatedvendor-advisory |
| https://cna.erlef.org/cves/CVE-2026-82732.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-82732 | related |
| https://github.com/ash-project/ash_typescript/com… | patch |
Impacted products
2 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:*:*:*:*:*:*:*:* |
||
| ash-project | ash_typescript |
Affected:
546a15e1a2d7dbf1df2d5a6ee4404bc3da87852e , < 21ab6f1229a4dccdb56bc37ed437d9672a0c4a4e
(git)
cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:* |
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"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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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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