{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-77856", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-08-30T17:30:01.406Z", "datePublished": "2026-09-01T02:08:46.189Z", "dateUpdated": "2026-09-01T14:49:22.592Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.AshTypescript.Rpc.FieldProcessing.FieldSelector'", "'Elixir.AshTypescript.Rpc'"], "packageName": "ash_typescript", "packageURL": "pkg:hex/ash_typescript", "product": "ash_typescript", "programFiles": ["lib/ash_typescript/rpc/field_processing/field_selector.ex", "lib/ash_typescript/rpc.ex"], "programRoutines": [{"name": "'Elixir.AshTypescript.Rpc.FieldProcessing.FieldSelector':resolve_typed_struct_field/2"}, {"name": "'Elixir.AshTypescript.Rpc':run_action/3"}], "repo": "https://github.com/ash-project/ash_typescript", "vendor": "ash-project", "versions": [{"lessThan": "0.18.0", "status": "affected", "version": "0.11.0", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.AshTypescript.Rpc.FieldProcessing.FieldSelector'", "'Elixir.AshTypescript.Rpc'"], "packageName": "ash-project/ash_typescript", "packageURL": "pkg:github/ash-project/ash_typescript", "product": "ash_typescript", "programFiles": ["lib/ash_typescript/rpc/field_processing/field_selector.ex", "lib/ash_typescript/rpc.ex"], "programRoutines": [{"name": "'Elixir.AshTypescript.Rpc.FieldProcessing.FieldSelector':resolve_typed_struct_field/2"}, {"name": "'Elixir.AshTypescript.Rpc':run_action/3"}], "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": "<p>The application exposes an AshTypescript RPC endpoint over HTTP and has at least one resource field backed by an <code>Ash.TypedStruct</code>, so that client-supplied names reach <code>resolve_typed_struct_field/2</code>.</p>"}, {"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": "<p>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.</p>\n<p><code>resolve_typed_struct_field/2</code> in <code>lib/ash_typescript/rpc/field_processing/field_selector.ex</code> looks a client-supplied field name up in the typed struct's reverse map and, when it finds no match, falls back to <code>String.to_atom/1</code>. 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.</p>\n<p>This issue affects ash_typescript: from 0.11.0 before 0.18.0.</p>"}, {"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'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.\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'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.\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": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-09-01T02:08:46.189Z"}, "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"}, "adp": [{"references": [{"url": "https://github.com/ash-project/ash_typescript/security/advisories/GHSA-rj47-h936-4cxw", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-01T14:49:00.470737Z", "id": "CVE-2026-77856", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-01T14:49:22.592Z"}}]}}

{}

{"affected": [{"affectedData": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.AshTypescript.Rpc.FieldProcessing.FieldSelector'", "'Elixir.AshTypescript.Rpc'"], "packageName": "ash_typescript", "packageURL": "pkg:hex/ash_typescript", "product": "ash_typescript", "programFiles": ["lib/ash_typescript/rpc/field_processing/field_selector.ex", "lib/ash_typescript/rpc.ex"], "programRoutines": [{"name": "'Elixir.AshTypescript.Rpc.FieldProcessing.FieldSelector':resolve_typed_struct_field/2"}, {"name": "'Elixir.AshTypescript.Rpc':run_action/3"}], "repo": "https://github.com/ash-project/ash_typescript", "vendor": "ash-project", "versions": [{"lessThan": "0.18.0", "status": "affected", "version": "0.11.0", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.AshTypescript.Rpc.FieldProcessing.FieldSelector'", "'Elixir.AshTypescript.Rpc'"], "packageName": "ash-project/ash_typescript", "packageURL": "pkg:github/ash-project/ash_typescript", "product": "ash_typescript", "programFiles": ["lib/ash_typescript/rpc/field_processing/field_selector.ex", "lib/ash_typescript/rpc.ex"], "programRoutines": [{"name": "'Elixir.AshTypescript.Rpc.FieldProcessing.FieldSelector':resolve_typed_struct_field/2"}, {"name": "'Elixir.AshTypescript.Rpc':run_action/3"}], "repo": "https://github.com/ash-project/ash_typescript", "vendor": "ash-project", "versions": [{"lessThan": "0ab5c83a7df28d51a6de1fb9b859a142b2b12919", "status": "affected", "version": "7c3d30896f2f9a54edea17e3787549776b1b288d", "versionType": "git"}]}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}], "cveTags": [], "descriptions": [{"lang": "en", "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'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.\n\nThis issue affects ash_typescript: from 0.11.0 before 0.18.0."}], "id": "CVE-2026-77856", "lastModified": "2026-09-01T15:17:27.610", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-77856", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-01T14:49:00.470737Z", "version": "2.0.3"}}]}, "published": "2026-09-01T03:16:51.500", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://cna.erlef.org/cves/CVE-2026-77856.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/ash-project/ash_typescript/commit/0ab5c83a7df28d51a6de1fb9b859a142b2b12919"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/ash-project/ash_typescript/security/advisories/GHSA-rj47-h936-4cxw"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://osv.dev/vulnerability/EEF-CVE-2026-77856"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/ash-project/ash_typescript/security/advisories/GHSA-rj47-h936-4cxw"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.11.0,0.18.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "ash_typescript", "source": "cna", "vendor": "ash-project"}, "product": "ash_typescript", "vendor": "ash-project"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7c3d30896f2f9a54edea17e3787549776b1b288d,0ab5c83a7df28d51a6de1fb9b859a142b2b12919)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "ash_typescript", "source": "cna", "vendor": "ash-project"}, "product": "ash_typescript", "vendor": "ash-project"}], "created": "2026-09-01T03:30:04.427722+00:00", "updated": "2026-09-01T14:16:03.068694+00:00", "vendors": ["ash-project", "ash-project$PRODUCT$ash_typescript"]}