CVE-2026-32770

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Prior to 9.6.0-alpha.19 and 8.6.43, a remote attacker can crash the Parse Server by subscribing to a LiveQuery with an invalid regular expression pattern. The server process terminates when the invalid pattern reaches the regex engine during subscription matching, causing denial of service for all connected clients. The fix in 9.6.0-alpha.19 and 8.6.43 validates regular expression patterns at subscription time, rejecting invalid patterns before they are stored. Additionally, a defense-in-depth try-catch prevents any subscription matching error from crashing the server process. As a workaround, disable LiveQuery if it is not needed."}, {"lang": "es", "value": "Parse Server es un backend de c\u00f3digo abierto que puede ser desplegado en cualquier infraestructura que pueda ejecutar Node.js. Antes de 9.6.0-alpha.19 y 8.6.43, un atacante remoto puede provocar la ca\u00edda del Parse Server al suscribirse a un LiveQuery con un patr\u00f3n de expresi\u00f3n regular inv\u00e1lido. El proceso del servidor termina cuando el patr\u00f3n inv\u00e1lido llega al motor de expresiones regulares durante la coincidencia de suscripci\u00f3n, causando denegaci\u00f3n de servicio para todos los clientes conectados. La correcci\u00f3n en 9.6.0-alpha.19 y 8.6.43 valida los patrones de expresiones regulares en el momento de la suscripci\u00f3n, rechazando patrones inv\u00e1lidos antes de que sean almacenados. Adem\u00e1s, un try-catch de defensa en profundidad evita que cualquier error de coincidencia de suscripci\u00f3n provoque la ca\u00edda del proceso del servidor. Como soluci\u00f3n alternativa, deshabilite LiveQuery si no es necesario."}], "id": "CVE-2026-32770", "lastModified": "2026-06-17T10:36:21.317", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-32770", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-19T14:21:43.823652Z", "version": "2.0.3"}}]}, "published": "2026-03-18T22:16:25.343", "references": [{"source": "security-advisories@github.com", "tags": ["Issue Tracking"], "url": "https://github.com/parse-community/parse-server/pull/10197"}, {"source": "security-advisories@github.com", "tags": ["Issue Tracking"], "url": "https://github.com/parse-community/parse-server/pull/10199"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/parse-community/parse-server/security/advisories/GHSA-827p-g5x5-h86c"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-248"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.0.0,9.6.0-alpha.19)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,8.6.43)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "parse-server", "source": "cna", "vendor": "parse-community"}, "product": "parse_server", "vendor": "parse_community"}], "analysis": {"en": {"generated_at": "2026-03-19T18:24:58.924459+00:00", "value": {"mitigation_remediation": ["Upgrade Parse Server to version 9.6.0\u2011alpha.19 or newer, or 8.6.43 or newer, which validates regex patterns before storage.", "If an upgrade is not immediately possible, disable the LiveQuery feature to prevent the crash.", "Continuously monitor vendor advisories and apply any security patches as they are released."], "summary": {"action": "Immediate Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "Affected systems are versions of Parse Server prior to 9.6.0\u2011alpha.19 and 8.6.43. All releases in the 9.6.x series up through alpha.18 and the 8.6.x series through 8.6.42 are vulnerable. The affected product is parse\u2011server, open\u2011source backend software that runs on Node.js. Only deployments using these vulnerable versions and that have LiveQuery enabled are at risk.", "description_and_impact": "The vulnerability is caused by Parse Server accepting an invalid regular expression in a LiveQuery subscription without validation. When a subscriber sends a malformed regex, the pattern is processed by the regex engine, causing the server process to terminate and all connected clients to lose service. This results in a denial\u2011of\u2011service impact for the affected Parse Server instance. The weakness is a lack of input validation (CWE\u2011248).", "risk_and_exploitability": "The CVSS score is 5.9, indicating a moderate severity. The EPSS score is below 1%, so the likelihood of exploitation is low, and the vulnerability is not listed in the CISA KEV catalog. The attack vector is remote through the LiveQuery API \u2013 an attacker can craft a subscription request with an invalid regular expression and trigger the crash. Because the crash terminates the entire server process, it abruptly denies service to all current and future clients, making it a critical impact if not mitigated."}}}}, "created": "2026-03-19T08:55:22.497826+00:00", "updated": "2026-03-25T11:52:04.849182+00:00", "vendors": ["parse_community", "parse_community$PRODUCT$parse_server"]}