CVE-2026-77856

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Source

https://cve.org/CVERecord?id=CVE-2026-77856

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77856.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-77856

Aliases

EEF-CVE-2026-77856
GHSA-rj47-h936-4cxw

Published

2026-09-01T02:08:46.189Z

Modified

2026-09-02T03:47:32.207055373Z

Severity

8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator

Summary

Unbounded atom creation from typed struct field names in AshTypescript field selector

Details

Allocation of Resources Without Limits or Throttling vulnerability in ash-project ash_typescript allows an unauthenticated attacker to exhaust the BEAM atom table and abort the node via client-supplied typed struct field names.

resolvetypedstructfield/2 in lib/ashtypescript/rpc/fieldprocessing/fieldselector.ex looks a client-supplied field name up in the typed struct's reverse map and, when it finds no match, falls back to String.to_atom/1. Because this runs before any field-existence check, an unresolvable name mints a permanent atom rather than being rejected as unknown. Atoms are never garbage collected, so a request carrying many distinct names on a typed struct field grows the atom table until the VM aborts at its limit.

This issue affects ash_typescript: from 0.11.0 before 0.18.0.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77856.json",
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "introduced": "7c3d30896f2f9a54edea17e3787549776b1b288d"
                },
                {
                    "fixed": "0ab5c83a7df28d51a6de1fb9b859a142b2b12919"
                }
            ]
        }
    ],
    "cna_assigner": "EEF",
    "cwe_ids": [
        "CWE-770"
    ]
}

References

Affected packages

Git / github.com/ash-project/ash_typescript

Affected ranges

Type

GIT

Repo

https://github.com/ash-project/ash_typescript

Events

Introduced

a42177bfc4acd27bb2f25372da9b3de467d6bcae

Fixed

808e4b17ee821a8dac98bda5bf01da0fe1b69d41

Fixed

0ab5c83a7df28d51a6de1fb9b859a142b2b12919

Database specific

Show details

{
    "source": [
        "DESCRIPTION",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0.11.0"
        },
        {
            "fixed": "0.18.0"
        }
    ]
}

Affected versions

v0.*

v0.11.0

v0.11.1

v0.11.2

v0.11.3

v0.11.4

v0.11.5

v0.11.6

v0.12.0

v0.12.1

v0.13.0

v0.13.1

v0.13.2

v0.14.0

v0.14.1

v0.14.2

v0.14.3

v0.14.4

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-2026-77856.json"