CVE-2026-58317

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "TTSSH2", "vendor": "TeraTerm Project", "versions": [{"lessThanOrEqual": "3.6.1", "status": "affected", "version": "1.00 alpha1", "versionType": "semver"}]}], "source": "vultures@jpcert.or.jp"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Unsigned to Signed Conversion Error (CWE-196) vulnerability exists in TTSSH2 plugin of Tera Term provided by TeraTerm Project. When Tera Term attempts to establish an SSH connection to a server set up by an attacker, out-of-bounds read/write may occur. As a result, the contents of adjacent memory regions may be transmitted to the server, and Tera Term may behave unexpected or terminate abnormally."}, {"lang": "es", "value": "Existe una vulnerabilidad de error de conversi\u00f3n de sin signo a con signo (CWE-196) en el plugin TTSSH2 de Tera Term proporcionado por TeraTerm Project. Cuando Tera Term intenta establecer una conexi\u00f3n SSH con un servidor configurado por un atacante, puede ocurrir una lectura/escritura fuera de l\u00edmites. Como resultado, el contenido de las regiones de memoria adyacentes puede ser transmitido al servidor, y Tera Term puede comportarse de forma inesperada o terminar de forma an\u00f3mala."}], "id": "CVE-2026-58317", "lastModified": "2026-10-24T20:10:00.137", "metrics": {"cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 6.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L", "version": "3.0"}, "exploitabilityScore": 2.8, "impactScore": 3.4, "source": "vultures@jpcert.or.jp", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.1, "baseSeverity": "MEDIUM", "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": "ACTIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:L/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": "LOW", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "vultures@jpcert.or.jp", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-58317", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-17T13:06:11.360435Z", "version": "2.0.3"}}]}, "published": "2026-07-17T05:16:40.180", "references": [{"source": "vultures@jpcert.or.jp", "url": "https://jvn.jp/en/jp/JVN65294474/"}, {"source": "vultures@jpcert.or.jp", "url": "https://teratermproject.github.io/SA/JVN65294474-en.html"}, {"source": "vultures@jpcert.or.jp", "url": "https://teratermproject.github.io/SA/JVN65294474.html"}], "sourceIdentifier": "vultures@jpcert.or.jp", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-196"}], "source": "vultures@jpcert.or.jp", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.00 alpha1,3.6.1]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "TTSSH2", "source": "cna", "vendor": "TeraTerm Project"}, "product": "ttssh2", "vendor": "teraterm_project"}], "created": "2026-07-22T03:15:03.229029+00:00", "updated": "2026-08-03T03:00:04.437824+00:00", "vendors": ["teraterm_project", "teraterm_project$PRODUCT$ttssh2"]}