{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-58317","assignerOrgId":"ede6fdc4-6654-4307-a26d-3331c018e2ce","state":"PUBLISHED","assignerShortName":"jpcert","dateReserved":"2026-07-10T02:15:08.138Z","datePublished":"2026-07-17T04:14:03.592Z","dateUpdated":"2026-07-17T13:06:39.880Z"},"containers":{"cna":{"affected":[{"vendor":"TeraTerm Project","product":"TTSSH2","defaultStatus":"unaffected","versions":[{"version":"1.00 alpha1","status":"affected","versionType":"semver","lessThanOrEqual":"3.6.1"}]}],"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."}],"problemTypes":[{"descriptions":[{"description":"Unsigned to signed conversion error","lang":"en-US","cweId":"CWE-196","type":"CWE"}]}],"references":[{"url":"https://teratermproject.github.io/SA/JVN65294474-en.html"},{"url":"https://teratermproject.github.io/SA/JVN65294474.html"},{"url":"https://jvn.jp/en/jp/JVN65294474/"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en-US","value":"GENERAL"}],"cvssV3_0":{"version":"3.0","baseSeverity":"MEDIUM","baseScore":6.3,"vectorString":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L"}},{"format":"CVSS","scenarios":[{"lang":"en-US","value":"GENERAL"}],"cvssV4_0":{"version":"4.0","baseSeverity":"MEDIUM","baseScore":5.1,"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"}}],"providerMetadata":{"orgId":"ede6fdc4-6654-4307-a26d-3331c018e2ce","shortName":"jpcert","dateUpdated":"2026-07-17T04:14:03.592Z"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-17T13:06:11.360435Z","id":"CVE-2026-58317","options":[{"Exploitation":"none"},{"Automatable":"no"},{"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":"2026-07-17T13:06:39.880Z"}}]}}