CVE-2026-58317
Medium
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.
SeverityMedium
CVSS5.1
Exploit probability—
ProductTTSSH2
PublishedJul 17, 2026
First seenJul 17, 2026
Weakness typeCWE-196CWE-196
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| TeraTerm Project TTSSH2 | 1.00 alpha1 ≤ v ≤ 3.6.1 | — |
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