Vulnerability-Lookup

JVNDB-2026-000099

Vulnerability from jvndb - Published: 2026-07-16 14:02 - Updated:2026-07-16 14:02

Severity

6.3 (Medium) - cvssV3_0 - CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

Summary

Multiple vulnerabilities in TTSSH2 plugin of Tera Term

Details

TTSSH2 plugin of Tera Term provided by TeraTerm Project contains the following vulnerabilities:

Unsigned to Signed Conversion Error (CWE-196) - CVE-2026-58317
Improper Handling of Length Parameter Inconsistency (CWE-130) - CVE-2026-60060

CVE-2026-58317 Yukihiro Nakamura reported this vulnerability to IPA. JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership. CVE-2026-60060 TeraTerm Project reported these vulnerabilities to JPCERT/CC to notify users of the solutions through JVN.

References

Type

URL

	JVN	https://jvn.jp/en/jp/JVN65294474/index.html
	CVE	https://www.cve.org/CVERecord?id=CVE-2026-58317
	CVE	https://www.cve.org/CVERecord?id=CVE-2026-60060
	No Mapping(CWE-Other)	https://www.ipa.go.jp/en/security/vulnerabilities/cwe.html

Impacted products

Vendor

Product

TeraTerm Project

TTSSH2

Show details on JVN DB website

JSON

To clipboard

{
  "@rdf:about": "https://jvndb.jvn.jp/en/contents/2026/JVNDB-2026-000099.html",
  "dc:date": "2026-07-16T14:02+09:00",
  "dcterms:issued": "2026-07-16T14:02+09:00",
  "dcterms:modified": "2026-07-16T14:02+09:00",
  "description": "TTSSH2 plugin of Tera Term provided by TeraTerm Project contains the following vulnerabilities:\u003ca href=\u0027https://cwe.mitre.org/data/definitions/196.html\u0027 target=\u0027_blank\u0027\u003e\u003c/a\u003e\u003ca href=\u0027https://cwe.mitre.org/data/definitions/130.html\u0027 target=\u0027_blank\u0027\u003e\u003c/a\u003e\u003cul\u003e\u003cli\u003eUnsigned to Signed Conversion Error (CWE-196) - CVE-2026-58317\u003c/li\u003e\u003cli\u003eImproper Handling of Length Parameter Inconsistency (CWE-130) - CVE-2026-60060\u003c/li\u003e\u003c/ul\u003eCVE-2026-58317\r\nYukihiro Nakamura reported this vulnerability to IPA.\r\nJPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.\r\n\r\nCVE-2026-60060\r\nTeraTerm Project reported these vulnerabilities to JPCERT/CC to notify users of the solutions through JVN.",
  "link": "https://jvndb.jvn.jp/en/contents/2026/JVNDB-2026-000099.html",
  "sec:cpe": {
    "#text": "cpe:/a:tera_term_project:ttssh2",
    "@product": "TTSSH2",
    "@vendor": "TeraTerm Project",
    "@version": "2.2"
  },
  "sec:cvss": {
    "@score": "6.3",
    "@severity": "Medium",
    "@type": "Base",
    "@vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L",
    "@version": "3.0"
  },
  "sec:identifier": "JVNDB-2026-000099",
  "sec:references": [
    {
      "#text": "https://jvn.jp/en/jp/JVN65294474/index.html",
      "@id": "JVN#65294474",
      "@source": "JVN"
    },
    {
      "#text": "https://www.cve.org/CVERecord?id=CVE-2026-58317",
      "@id": "CVE-2026-58317",
      "@source": "CVE"
    },
    {
      "#text": "https://www.cve.org/CVERecord?id=CVE-2026-60060",
      "@id": "CVE-2026-60060",
      "@source": "CVE"
    },
    {
      "#text": "https://www.ipa.go.jp/en/security/vulnerabilities/cwe.html",
      "@id": "CWE-Other",
      "@title": "No Mapping(CWE-Other)"
    }
  ],
  "title": "Multiple vulnerabilities in TTSSH2 plugin of Tera Term"
}

CVE-2026-58317 (GCVE-0-2026-58317)

Vulnerability from cvelistv5 – Published: 2026-07-17 04:14 – Updated: 2026-07-17 04:14

Summary

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.

Severity

6.3 (Medium)


                        
                          CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

5.1 (Medium)


                        
                          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

CWE

CWE-196 - Unsigned to signed conversion error

Assigner

jpcert

References

3 references

URL	Tags
https://teratermproject.github.io/SA/JVN65294474-…
https://teratermproject.github.io/SA/JVN65294474.html
https://jvn.jp/en/jp/JVN65294474/

Impacted products

1 product

Vendor	Product	Version
TeraTerm Project	TTSSH2	Affected: 1.00 alpha1 , ≤ 3.6.1 (semver)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "TTSSH2",
          "vendor": "TeraTerm Project",
          "versions": [
            {
              "lessThanOrEqual": "3.6.1",
              "status": "affected",
              "version": "1.00 alpha1",
              "versionType": "semver"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_0": {
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L",
            "version": "3.0"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en-US",
              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV4_0": {
            "baseScore": 5.1,
            "baseSeverity": "MEDIUM",
            "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",
            "version": "4.0"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en-US",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-196",
              "description": "Unsigned to signed conversion error",
              "lang": "en-US",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-17T04:14:03.592Z",
        "orgId": "ede6fdc4-6654-4307-a26d-3331c018e2ce",
        "shortName": "jpcert"
      },
      "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/"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "ede6fdc4-6654-4307-a26d-3331c018e2ce",
    "assignerShortName": "jpcert",
    "cveId": "CVE-2026-58317",
    "datePublished": "2026-07-17T04:14:03.592Z",
    "dateReserved": "2026-07-10T02:15:08.138Z",
    "dateUpdated": "2026-07-17T04:14:03.592Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-60060 (GCVE-0-2026-60060)

Vulnerability from cvelistv5 – Published: 2026-07-17 04:13 – Updated: 2026-07-17 04:13

Summary

Improper Handling of Length Parameter Inconsistency (CWE-130) 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.

Severity

6.3 (Medium)


                        
                          CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

5.1 (Medium)


                        
                          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

CWE

CWE-130 - Improper handling of length parameter inconsistency

Assigner

jpcert

References

3 references

URL	Tags
https://teratermproject.github.io/SA/JVN65294474-…
https://teratermproject.github.io/SA/JVN65294474.html
https://jvn.jp/en/jp/JVN65294474/

Impacted products

1 product

Vendor	Product	Version
TeraTerm Project	TTSSH2	Affected: 1.00 alpha1 , ≤ 3.6.1 (semver)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "TTSSH2",
          "vendor": "TeraTerm Project",
          "versions": [
            {
              "lessThanOrEqual": "3.6.1",
              "status": "affected",
              "version": "1.00 alpha1",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Improper Handling of Length Parameter Inconsistency (CWE-130) 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."
        }
      ],
      "metrics": [
        {
          "cvssV3_0": {
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L",
            "version": "3.0"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en-US",
              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV4_0": {
            "baseScore": 5.1,
            "baseSeverity": "MEDIUM",
            "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",
            "version": "4.0"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en-US",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-130",
              "description": "Improper handling of length parameter inconsistency",
              "lang": "en-US",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-17T04:13:38.109Z",
        "orgId": "ede6fdc4-6654-4307-a26d-3331c018e2ce",
        "shortName": "jpcert"
      },
      "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/"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "ede6fdc4-6654-4307-a26d-3331c018e2ce",
    "assignerShortName": "jpcert",
    "cveId": "CVE-2026-60060",
    "datePublished": "2026-07-17T04:13:38.109Z",
    "dateReserved": "2026-07-10T02:15:09.033Z",
    "dateUpdated": "2026-07-17T04:13:38.109Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

JVNDB-2026-000099

CVE-2026-58317 (GCVE-0-2026-58317)

CVE-2026-60060 (GCVE-0-2026-60060)

Tags

Sightings

Nomenclature