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[Japanese]
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JVNDB-2026-000099
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Multiple vulnerabilities in TTSSH2 plugin of Tera Term
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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.
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CVSS V3 Severity:
Base Metrics 6.3 (Medium) [IPA Score]
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: Required
- Scope: Unchanged
- Confidentiality Impact: Low
- Integrity Impact: Low
- Availability Impact: Low
CVSS v4 Severity
Base Metrics: 5.1 (Medium) [IPA Score]
- Access Vector (AV): Network
- Attack Complexity (AC): Low
- Attack Requirements (AT): None
- Privileges Required (PR): None
- User Interaction (UI): Active
Vulnerable System Impact
- Confidentiality Impact (VC): Low
- Integrity Impact (VI): Low
- Availability Impact (VA): Low
Subsequent System Impact
- Confidentiality Impact (SC): None
- Integrity Impact (SI): None
- Availability Impact (SA): None
The above CVSS base scores have been assigned for CVE-2026-58317
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CVSS v3 Severity
Base Metrics: 6.3(Medium) [IPA Score]
- Access Vector : Network
- Attack Complexity : Low
- Privileges Required : None
- User Interaction : Required
- Scope : Unchanged
- Confidentiality Impact : Low
- Integrity Impact : Low
- Availability Impact : Low
CVSS v4 Severity
Base Metrics: 5.1 (Medium) [IPA Score]
- Access Vector (AV): Network
- Attack Complexity (AC): Low
- Attack Requirements (AT): None
- Privileges Required (PR): None
- User Interaction (UI): Active
Vulnerable System Impact
- Confidentiality Impact (VC): Low
- Integrity Impact (VI): Low
- Availability Impact (VA): Low
Subsequent System Impact
- Confidentiality Impact (SC): None
- Integrity Impact (SI): None
- Availability Impact (SA): None
The above CVSS base scores have been assigned for CVE-2026-60060
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TeraTerm Project
- TTSSH2 1.00 alpha1 to 3.6.1
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For information regarding the versions of Tera Term that include the affected TTSSH2, refer to the information provided by the developer.
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The following conditions may occur when Tera Term attempts to establish an SSH connection to a server set up by an attacker:- An out-of-bounds read may result in data from adjacent memory being treated as part of an incoming packet.
- An out-of-bounds write may occur. The attacker cannot freely control the value written; only a temporary null-byte ('\0') write followed by restoration of the original value is possible.
As a result, the contents of adjacent memory regions may be transmitted to the server, and Tera Term may behave unexpected or terminate abnormally.
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[Update the Software]
Update the software to the latest version in the Tera Term 5 series according to the information provided by the developer.
The developer has released the following version to address these vulnerabilities: - TTSSH2 3.6.2 (Tera Term 5.6.2)
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TeraTerm Project
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- No Mapping(CWE-Other) [IPA Evaluation]
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- CVE-2026-58317
- CVE-2026-60060
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- JVN : JVN#65294474
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- [2026/07/16]
Web page was published
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