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CVE-2026-58317 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

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

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:4.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

CNA: [email protected]CVSS-B:6.3 MEDIUMVector:CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://jvn.jp/en/jp/JVN65294474/	[email protected]	AdvisoryBundleRemedy
https://teratermproject.github.io/SA/JVN65294474-en.html	[email protected]	AdvisoryRemedyVendor
https://teratermproject.github.io/SA/JVN65294474.html	[email protected]	AdvisoryRemedyVendor

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-196	Unsigned to Signed Conversion Error	[email protected]

Affected Products

Product	Versions
TeraTerm Project TTSSH2	>= 1.00 alpha1, <= 3.6.1
CPE cpe:2.3:a:tera_term_project:tera_term:::::::: Remediation Upgrade: 3.6.2moderate effort

Change History

2 change records found show changes

Date	Action	Recorded By
Jul 17, 2026	CVE Modified	CISA-ADP
Jul 17, 2026	New CVE Received	[email protected]