Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-58317

Quick assessment

Affected
TeraTerm Project TTSSH2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

TeraTerm Project TTSSH2是TeraTerm Project组织的一款SSH通信软件。 TeraTerm Project TTSSH2 1.00 alpha1版本及3.6.1及之前版本存在数字错误漏洞，该漏洞源于无符号到有符号转换错误，当Tera Term尝试建立SSH连接到攻击者设置的服务器时，可能发生越界读取/写入，导致相邻内存区域内容传输到服务器，并且Tera Term可能出现意外行为或异常终止。

AI Predicted 5.9 Difficulty: Moderate EPSS 0.32% · P23

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
TeraTerm Project TTSSH2 1.00 alpha1≤ 3.6.1 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-58317

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
无符号至有符号转换错误
Source: CVE Program / CVE List V5
Vulnerability Title
TeraTerm Project TTSSH2 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TeraTerm Project TTSSH2是TeraTerm Project组织的一款SSH通信软件。 TeraTerm Project TTSSH2 1.00 alpha1版本及3.6.1及之前版本存在数字错误漏洞，该漏洞源于无符号到有符号转换错误，当Tera Term尝试建立SSH连接到攻击者设置的服务器时，可能发生越界读取/写入，导致相邻内存区域内容传输到服务器，并且Tera Term可能出现意外行为或异常终止。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
TeraTerm Project TTSSH2 1.00 alpha1 ~ 3.6.1 -

II. Public POCs for CVE-2026-58317

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-58317

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-58317 (1)

Security Blog Posts for CVE-2026-58317 (2)

IV. Related Vulnerabilities

Same product: TTSSH2
Same vendor: TeraTerm Project
Same weakness: CWE-196

V. Comments for CVE-2026-58317

No comments yet

Leave a comment