{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-34211", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-26T15:57:52.324Z", "datePublished": "2026-04-06T15:10:42.261Z", "dateUpdated": "2026-04-07T14:09:53.356Z"}, "containers": {"cna": {"title": "SandboxJS: Stack overflow DoS via deeply nested expressions in recursive descent parser", "problemTypes": [{"descriptions": [{"cweId": "CWE-674", "lang": "en", "description": "CWE-674: Uncontrolled Recursion", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 6.9, "baseSeverity": "MEDIUM", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/nyariv/SandboxJS/security/advisories/GHSA-8pfc-jjgw-6g26", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/nyariv/SandboxJS/security/advisories/GHSA-8pfc-jjgw-6g26"}], "affected": [{"vendor": "nyariv", "product": "SandboxJS", "versions": [{"version": "< 0.8.36", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-04-06T15:10:42.261Z"}, "descriptions": [{"lang": "en", "value": "SandboxJS is a JavaScript sandboxing library. Prior to 0.8.36, the @nyariv/sandboxjs parser contains unbounded recursion in the restOfExp function and the lispify/lispifyExpr call chain. An attacker can crash any Node.js process that parses untrusted input by supplying deeply nested expressions (e.g., ~2000 nested parentheses), causing a RangeError: Maximum call stack size exceeded that terminates the process. This vulnerability is fixed in 0.8.36."}], "source": {"advisory": "GHSA-8pfc-jjgw-6g26", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-04-07T14:08:58.449756Z", "id": "CVE-2026-34211", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"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": "2026-04-07T14:09:53.356Z"}}]}}

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.8.36)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "SandboxJS", "source": "cna", "vendor": "nyariv"}, "product": "sandboxjs", "vendor": "nyariv"}], "analysis": {"en": {"generated_at": "2026-04-06T17:38:39.842026+00:00", "value": {"mitigation_remediation": ["Update the npm package to @nyariv/sandboxjs@0.8.36 or newer.", "Restrict or sanitize input to prevent deeply nested expressions before passing them to the parser.", "Monitor Node.js processes for unexpected Termination (RangeError) and apply the patch as soon as possible."], "summary": {"action": "Immediate Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "The vulnerability affects the Nyariv SandboxJS library prior to version 0.8.36. Any Node.js application that loads this library and parses user-supplied input is susceptible.", "description_and_impact": "A stack overflow occurs in the SandboxJS parser when it encounters deeply nested expressions during evaluation, causing a RangeError that terminates the Node.js process. The flaw is a classic instance of uncontrolled recursion as classified by CWE-674 and results in service disruption for any process that processes untrusted input through SandboxJS.", "risk_and_exploitability": "The CVSS score of 6.9 indicates moderate severity. No EPSS data is available, and the issue is not listed in the CISA KEV catalog. An attacker can exploit the flaw by sending a crafted payload containing a large number of nested parentheses or similar constructs, forcing the parser to recurse until the maximum call stack size is exceeded."}}}}, "created": "2026-04-06T20:14:13.411079+00:00", "updated": "2026-04-06T21:32:26.690365+00:00", "vendors": ["nyariv", "nyariv$PRODUCT$sandboxjs"]}