CVE Catalog

CVE-2026-58317

MediumCVSS 6.3
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.32%

24th percentile - higher than 24% of all known CVEs

Summary

An Unsigned to Signed Conversion Error (CWE-196) vulnerability exists in the TTSSH2 plugin of Tera Term. When Tera Term attempts to establish an SSH connection to an attacker-controlled server, out-of-bounds read/write may occur.

Risk Assessment

An attacker could exploit this vulnerability to read adjacent memory contents, potentially leaking sensitive data. It may also cause Tera Term to behave unexpectedly or terminate abnormally, disrupting administrative work.

Recommendation

Update the TTSSH2 plugin to the latest version provided by the TeraTerm Project. Until updated, avoid establishing SSH connections to untrusted servers.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS