CVE-2026-0773

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{"affected": [{"affectedData": [{"defaultStatus": "unknown", "product": "Upsonic", "vendor": "Upsonic", "versions": [{"status": "affected", "version": "0.52.1"}]}], "source": "zdi-disclosures@trendmicro.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Upsonic Cloudpickle Deserialization of Untrusted Data Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Upsonic. Authentication is not required to exploit this vulnerability.\n\nThe specific flaw exists within the add_tool endpoint, which listens on TCP port 7541 by default. The issue results from the lack of proper validation of user-supplied data, which can result in deserialization of untrusted data. An attacker can leverage this vulnerability to execute code in the context of the service account. Was ZDI-CAN-26845."}, {"lang": "es", "value": "Vulnerabilidad de Ejecuci\u00f3n Remota de C\u00f3digo por Deserializaci\u00f3n de Datos No Confiables en Upsonic Cloudpickle. Esta vulnerabilidad permite a atacantes remotos ejecutar c\u00f3digo arbitrario en instalaciones afectadas de Upsonic. La autenticaci\u00f3n no es requerida para explotar esta vulnerabilidad.\n\nLa falla espec\u00edfica existe dentro del endpoint add_tool, que escucha en el puerto TCP 7541 por defecto. El problema resulta de la falta de validaci\u00f3n adecuada de los datos proporcionados por el usuario, lo que puede resultar en la deserializaci\u00f3n de datos no confiables. Un atacante puede aprovechar esta vulnerabilidad para ejecutar c\u00f3digo en el contexto de la cuenta de servicio. Fue ZDI-CAN-26845."}], "id": "CVE-2026-0773", "lastModified": "2026-06-17T10:11:21.457", "metrics": {"cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.0"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "zdi-disclosures@trendmicro.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-0773", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-01-23T16:25:30.243448Z", "version": "2.0.3"}}]}, "published": "2026-01-23T04:16:04.493", "references": [{"source": "zdi-disclosures@trendmicro.com", "url": "https://www.zerodayinitiative.com/advisories/ZDI-26-042/"}], "sourceIdentifier": "zdi-disclosures@trendmicro.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-502"}], "source": "zdi-disclosures@trendmicro.com", "type": "Secondary"}]}

{}

{"analysis": {"en": {"generated_at": "2026-04-18T03:15:17.481124+00:00", "value": {"mitigation_remediation": ["Update to the latest patched version of Upsonic that resolves the deserialization issue", "If an immediate update is not possible, block or restrict inbound traffic to TCP port 7541 using a firewall or network ACL", "Disable the add_tool endpoint or remove the service if it is not required for operational purposes", "Apply an upstream patch from the vendor or use a custom wrapper that sanitizes incoming payloads before deserialization"], "summary": {"action": "Immediate Patch", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "The flaw affects all installations of Upsonic\u2019s Upsonic product. No specific version range is provided in the advisory, so any deployment running the vulnerable add_tool endpoint contains the vulnerability.", "description_and_impact": "An attacker can send specially crafted data to the add_tool endpoint of Upsonic\u2019s service, which listens on TCP port 7541. The server deserializes the payload without validating it, allowing execution of arbitrary code in the service account context. This flaw is a classic deserialization weakness (CWE\u2011502) that can compromise confidentiality, integrity, and availability of the affected system. The vulnerability requires no authentication, giving remote attackers full control over the target once the endpoint is reachable.", "risk_and_exploitability": "The CVSS score of 9.8 marks this flaw as Critical, confirming the potential for complete system compromise. Although the EPSS score is below 1\u202f%, indicating a low current exploitation probability, the lack of authentication and remote reachability means this vulnerability can be abused once traffic to port 7541 is allowed. The advisory does not place it in the KEV catalog, but the high severity and remote nature warrant urgent attention. Exploitation requires only network access to the service port; no additional credentials or local privileges are needed."}}}}, "created": "2026-01-23T10:26:57.619056+00:00", "updated": "2026-04-18T03:15:35.438306+00:00", "vendors": ["upsonic", "upsonic$PRODUCT$upsonic"]}