Is CVE-2026-58317 actively exploited?

No active exploitation of CVE-2026-58317 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-58317 be exploited remotely?

Yes. CVE-2026-58317 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-58317?

CVE-2026-58317 has a CVSS score of 5.1 (MEDIUM).

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MEDIUM

CVE-2026-58317

CWE-196Published: July 17, 2026· Updated: Jul 17, 2026

5.1

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2026-58317 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (A) is needed, which slightly reduces the risk of mass automated attacks.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionA

ScopeX

Impact

Confidentiality

Integrity

Availability

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X