CVE-2026-53426

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Any application that passes untrusted input to the <tt>{:json, ...}</tt> source of <tt>MDEx.parse_document</tt> is exposed to an unauthenticated denial-of-service.</p><p>This issue affects mdex from 0.4.3 before 0.13.2.</p>"}], "value": "Allocation of Resources Without Limits or Throttling vulnerability in leandrocp MDEx allows Excessive Allocation.\n\nMDEx.parse_document/2 accepts a {:json, json} source. In lib/mdex.ex, the private json_to_node/1 function passes the attacker-controlled node_type value to Module.concat/1, which calls String.to_atom/1 and interns a brand-new atom for every distinct value. Atoms are never garbage collected on the BEAM, so a crafted JSON document carrying a unique node_type at each (deeply nested) node mints one permanent atom per node.\n\nA single document can intern hundreds of thousands of atoms, and a large enough document exhausts the default atom table (around 1,048,576 atoms) and aborts the entire Erlang VM, taking down every process on the node. 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The {:markdown, ...} source is not affected.", "supportingMedia": [{"type": "text/html", "value": "<p>Do not pass untrusted or attacker-controlled input to the <tt>{:json, ...}</tt> source of <tt>MDEx.parse_document/2</tt>. The <tt>{:markdown, ...}</tt> source is not affected.</p>", "base64": false}]}], "x_generator": {"engine": "cvelib 1.8.0"}, "descriptions": [{"lang": "en", "value": "Allocation of Resources Without Limits or Throttling vulnerability in leandrocp MDEx allows Excessive Allocation.\n\nMDEx.parse_document/2 accepts a {:json, json} source. In lib/mdex.ex, the private json_to_node/1 function passes the attacker-controlled node_type value to Module.concat/1, which calls String.to_atom/1 and interns a brand-new atom for every distinct value. Atoms are never garbage collected on the BEAM, so a crafted JSON document carrying a unique node_type at each (deeply nested) node mints one permanent atom per node.\n\nA single document can intern hundreds of thousands of atoms, and a large enough document exhausts the default atom table (around 1,048,576 atoms) and aborts the entire Erlang VM, taking down every process on the node. Any application that passes untrusted input to the {:json, ...} source of MDEx.parse_document is exposed to an unauthenticated denial-of-service.\n\nThis issue affects mdex from 0.4.3 before 0.13.2.", "supportingMedia": [{"type": "text/html", "value": "<p>Allocation of Resources Without Limits or Throttling vulnerability in leandrocp MDEx allows Excessive Allocation.</p><p><tt>MDEx.parse_document/2</tt> accepts a <tt>{:json, json}</tt> source. In <tt>lib/mdex.ex</tt>, the private <tt>json_to_node/1</tt> function passes the attacker-controlled <tt>node_type</tt> value to <tt>Module.concat/1</tt>, which calls <tt>String.to_atom/1</tt> and interns a brand-new atom for every distinct value. Atoms are never garbage collected on the BEAM, so a crafted JSON document carrying a unique <tt>node_type</tt> at each (deeply nested) node mints one permanent atom per node.</p><p>A single document can intern hundreds of thousands of atoms, and a large enough document exhausts the default atom table (around 1,048,576 atoms) and aborts the entire Erlang VM, taking down every process on the node. Any application that passes untrusted input to the <tt>{:json, ...}</tt> source of <tt>MDEx.parse_document</tt> is exposed to an unauthenticated denial-of-service.</p><p>This issue affects mdex from 0.4.3 before 0.13.2.</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-770", "description": "CWE-770 Allocation of Resources Without Limits or Throttling"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "0.13.2", "versionStartIncluding": "0.4.3"}], "operator": "AND"}], "operator": "OR"}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-06-29T19:11:32.605Z"}}}, "cveMetadata": {"cveId": "CVE-2026-53426", "state": "PUBLISHED", "dateUpdated": "2026-06-29T20:49:48.817Z", "dateReserved": "2026-06-09T11:01:47.529Z", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "datePublished": "2026-06-29T19:11:32.605Z", "assignerShortName": "EEF"}, "dataVersion": "5.2"}

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In lib/mdex.ex, the private json_to_node/1 function passes the attacker-controlled node_type value to Module.concat/1, which calls String.to_atom/1 and interns a brand-new atom for every distinct value. Atoms are never garbage collected on the BEAM, so a crafted JSON document carrying a unique node_type at each (deeply nested) node mints one permanent atom per node.\n\nA single document can intern hundreds of thousands of atoms, and a large enough document exhausts the default atom table (around 1,048,576 atoms) and aborts the entire Erlang VM, taking down every process on the node. Any application that passes untrusted input to the {:json, ...} source of MDEx.parse_document is exposed to an unauthenticated denial-of-service.\n\nThis issue affects mdex from 0.4.3 before 0.13.2."}, {"lang": "es", "value": "Vulnerabilidad de Asignaci\u00f3n de Recursos Sin L\u00edmites ni Limitaci\u00f3n en leandrocp MDEx permite Asignaci\u00f3n Excesiva.\n\nMDEx.parse_document/2 acepta una fuente {:json, json}. En lib/mdex.ex, la funci\u00f3n privada json_to_node/1 pasa el valor node_type controlado por el atacante a Module.concat/1, que llama a String.to_atom/1 e interna un \u00e1tomo completamente nuevo por cada valor distinto. Los \u00e1tomos nunca se recolectan como basura en BEAM, por lo que un documento JSON manipulado que lleva un node_type \u00fanico en cada nodo (profundamente anidado) crea un \u00e1tomo permanente por nodo.\n\nUn solo documento puede internar cientos de miles de \u00e1tomos, y un documento lo suficientemente grande agota la tabla de \u00e1tomos predeterminada (alrededor de 1.048.576 \u00e1tomos) y aborta toda la VM de Erlang, derribando cada proceso en el nodo. Cualquier aplicaci\u00f3n que pase entrada no confiable a la fuente {:json, ...} de MDEx.parse_document est\u00e1 expuesta a una denegaci\u00f3n de servicio no autenticada.\n\nEste problema afecta a mdex desde 0.4.3 antes de 0.13.2."}], "id": "CVE-2026-53426", "lastModified": "2026-10-25T21:10:00.770", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "LOCAL", "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": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/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-2026-53426", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-29T20:49:38.921685Z", "version": "2.0.3"}}]}, "published": "2026-06-29T20:17:38.473", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://cna.erlef.org/cves/CVE-2026-53426.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/leandrocp/mdex/commit/00fddf444220a1f1cc0af0a1cab6738804878387"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/leandrocp/mdex/security/advisories/GHSA-923r-7vf4-5vw8"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://osv.dev/vulnerability/EEF-CVE-2026-53426"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Deferred", "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": "[0.4.3,0.13.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cbb59a3f792dbc343873adec3466f49c853dc309,00fddf444220a1f1cc0af0a1cab6738804878387)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "mdex", "vendor": "leandrocp"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.4.3,0.13.2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "mdex", "source": "cna", "vendor": "leandrocp"}, "product": "mdex", "vendor": "leandrocp"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cbb59a3f792dbc343873adec3466f49c853dc309,00fddf444220a1f1cc0af0a1cab6738804878387)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "mdex", "source": "cna", "vendor": "leandrocp"}, "product": "mdex", "vendor": "leandrocp"}], "created": "2026-06-29T20:30:03.230295+00:00", "updated": "2026-06-30T00:15:05.007273+00:00", "vendors": ["leandrocp", "leandrocp$PRODUCT$mdex"]}