Is CVE-2026-58317 in the CISA KEV catalog?

No. CVE-2026-58317 is not currently on the CISA Known Exploited Vulnerabilities list.

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

CVE-2026-58317 has a CVSS v3 base score of 6.3 (MEDIUM).

What is the EPSS score for CVE-2026-58317?

CVE-2026-58317 has an EPSS score of 0.32% (24th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2026-58317?

No published fix for CVE-2026-58317 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2026-58317

MEDIUM

6.3

CVSS v3

NVD

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.

CWE-196

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

TridentStack Control tracks known vulnerabilities across your Windows, macOS, and Linux fleet and shows the fix as soon as one is published. See how it works

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityLow

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

Exploit Intelligence

0.32%probability of exploitation in 30 days

24thpercentile

Low risk: more likely to be exploited than 24% of all known CVEs.

References

Other references3

Related Vulnerabilities

Other CWE-196 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-7067	High	7.5	4.3%	-	Fix
CVE-2020-13545	High	7.8	1.6%	-	-
CVE-2022-36025	Critical	9.1	0.9%	-	Fix
CVE-2026-14454	Critical	9.8	0.4%	-	Fix
CVE-2023-0185	Medium	6.7	0.2%	-	Fix
CVE-2026-34155	Medium	5.3	0.1%	-	Fix

Embed a live status badge for CVE-2026-58317

Markdown

[![CVE-2026-58317](https://tridentstack.com/cve/badge/CVE-2026-58317.svg)](https://tridentstack.com/cve/CVE-2026-58317)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-58317"><img src="https://tridentstack.com/cve/badge/CVE-2026-58317.svg" alt="CVE-2026-58317"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

See how it works Start freeThis CVE lookup is free and always will be.

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-17.