CVE-2026-82732

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Source
https://cve.org/CVERecord?id=CVE-2026-82732
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82732.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-82732
Aliases
Published
2026-09-01T02:09:15.070Z
Modified
2026-09-02T03:47:32.251545582Z
Severity
  • 6.3 (Medium) CVSS_V4 - 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 CVSS Calculator
Summary
Declared argument constraints not enforced on AshTypescript typed controller routes
Details

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/ashtypescript/typedcontroller/requesthandler.ex calls Ash.Type.castinput/3 and treats an {:ok, cast} result as fully validated. In Ash these are separate steps: castinput/3 only coerces the term, while every constraint declared on the argument is applied by Ash.Type.applyconstraints/3, which this path never calls. Constraints such as oneof, maxlength, 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 applyconstraints, so the allownil?: 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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82732.json",
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "introduced": "546a15e1a2d7dbf1df2d5a6ee4404bc3da87852e"
                },
                {
                    "fixed": "21ab6f1229a4dccdb56bc37ed437d9672a0c4a4e"
                }
            ]
        }
    ],
    "cna_assigner": "EEF",
    "cwe_ids": [
        "CWE-20"
    ]
}
References

Affected packages

Git / github.com/ash-project/ash_typescript

Affected ranges

Type
GIT
Repo
https://github.com/ash-project/ash_typescript
Events
Introduced
fb4cc367b85b68d90b99be692dcbbbfc248c1adb
Fixed
808e4b17ee821a8dac98bda5bf01da0fe1b69d41
Fixed
21ab6f1229a4dccdb56bc37ed437d9672a0c4a4e
Database specific
Show details 
{
    "source": [
        "DESCRIPTION",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0.15.0"
        },
        {
            "fixed": "0.18.0"
        }
    ]
}

Affected versions

v0.*
v0.15.0
v0.15.1
v0.15.2
v0.15.3

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82732.json"