CVE-2026-77856 (GCVE-0-2026-77856)
Vulnerability from cvelistv5 – Published: 2026-09-01 02:08 – Updated: 2026-09-01 14:49
VLAI
EPSS
VEX
Title
Unbounded atom creation from typed struct field names in AshTypescript field selector
Summary
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.
resolve_typed_struct_field/2 in lib/ash_typescript/rpc/field_processing/field_selector.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.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-01 14:49 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ash-project/ash_typescript/sec… | relatedvendor-advisory |
| https://cna.erlef.org/cves/CVE-2026-77856.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-77856 | related |
| https://github.com/ash-project/ash_typescript/com… | patch |
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| ash-project | ash_typescript |
Affected:
0.11.0 , < 0.18.0
(semver)
cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:* |
||
| ash-project | ash_typescript |
Affected:
7c3d30896f2f9a54edea17e3787549776b1b288d , < 0ab5c83a7df28d51a6de1fb9b859a142b2b12919
(git)
cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:* |
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"repo": "https://github.com/ash-project/ash_typescript",
"vendor": "ash-project",
"versions": [
{
"lessThan": "0ab5c83a7df28d51a6de1fb9b859a142b2b12919",
"status": "affected",
"version": "7c3d30896f2f9a54edea17e3787549776b1b288d",
"versionType": "git"
}
]
}
],
"configurations": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eThe application exposes an AshTypescript RPC endpoint over HTTP and has at least one resource field backed by an \u003ccode\u003eAsh.TypedStruct\u003c/code\u003e, so that client-supplied names reach \u003ccode\u003eresolve_typed_struct_field/2\u003c/code\u003e.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "The application exposes an AshTypescript RPC endpoint over HTTP and has at least one resource field backed by an `Ash.TypedStruct`, so that client-supplied names reach `resolve_typed_struct_field/2`."
}
],
"value": "The application exposes an AshTypescript RPC endpoint over HTTP and has at least one resource field backed by an Ash.TypedStruct, so that client-supplied names reach resolve_typed_struct_field/2."
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*",
"versionEndExcluding": "0.18.0",
"versionStartIncluding": "0.11.0",
"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\u003eAllocation 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.\u003c/p\u003e\n\u003cp\u003e\u003ccode\u003eresolve_typed_struct_field/2\u003c/code\u003e in \u003ccode\u003elib/ash_typescript/rpc/field_processing/field_selector.ex\u003c/code\u003e looks a client-supplied field name up in the typed struct\u0027s reverse map and, when it finds no match, falls back to \u003ccode\u003eString.to_atom/1\u003c/code\u003e. 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.\u003c/p\u003e\n\u003cp\u003eThis issue affects ash_typescript: from 0.11.0 before 0.18.0.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "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.\n\n`resolve_typed_struct_field/2` in `lib/ash_typescript/rpc/field_processing/field_selector.ex` looks a client-supplied field name up in the typed struct\u0027s 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.\n\nThis issue affects ash_typescript: from 0.11.0 before 0.18.0."
}
],
"value": "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.\n\nresolve_typed_struct_field/2 in lib/ash_typescript/rpc/field_processing/field_selector.ex looks a client-supplied field name up in the typed struct\u0027s 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.\n\nThis issue affects ash_typescript: from 0.11.0 before 0.18.0."
}
],
"impacts": [
{
"capecId": "CAPEC-130",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-130 Excessive Allocation"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"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:N/VA:H/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-770",
"description": "CWE-770 Allocation of Resources Without Limits or Throttling",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-01T02:08:46.189Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
},
"references": [
{
"tags": [
"related",
"vendor-advisory"
],
"url": "https://github.com/ash-project/ash_typescript/security/advisories/GHSA-rj47-h936-4cxw"
},
{
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-77856.html"
},
{
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-77856"
},
{
"tags": [
"patch"
],
"url": "https://github.com/ash-project/ash_typescript/commit/0ab5c83a7df28d51a6de1fb9b859a142b2b12919"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Unbounded atom creation from typed struct field names in AshTypescript field selector"
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-77856",
"datePublished": "2026-09-01T02:08:46.189Z",
"dateReserved": "2026-08-30T17:30:01.406Z",
"dateUpdated": "2026-09-01T14:49:22.592Z",
"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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