CVE-2026-58317

MEDIUM 6.3

CVSS Score

6.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	teraterm project
Product	ttssh2
Published	Jul 17, 2026

Stay Ahead of the Next One

Get instant alerts for teraterm project ttssh2

Be the first to know when new medium vulnerabilities affecting teraterm project ttssh2 are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

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

Affected Versions

TeraTerm Project / TTSSH2

1.00 alpha1 ≤ 3.6.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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