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CVE-2026-48851

Quick assessment

Affected
PuTTY PuTTY
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.

PuTTY是Simon Tatham个人开发者的一套免费的Telnet、Rlogin和SSH客户端软件。该软件主要用于对Linux系统进行远程管理。 PuTTY 0.84之前版本存在安全漏洞，该漏洞源于使用PuTTY图标副本作为TELNET数据的信任指示，但代理认证和主会话之间未清除信任状态。

CVSS 3.1 · Low EPSS 0.29% · P19

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
PuTTY PuTTY 0.77< 0.84 affected
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I. Basic Information for CVE-2026-48851

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
PuTTY 0.77 before 0.84 uses a copy of the PuTTY icon as a trust indication for TELNET data but the trust status is not cleared between proxy authentication and the main session.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键信息的UI错误表达
Source: CVE Program / CVE List V5
Vulnerability Title
PuTTY 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PuTTY是Simon Tatham个人开发者的一套免费的Telnet、Rlogin和SSH客户端软件。该软件主要用于对Linux系统进行远程管理。 PuTTY 0.84之前版本存在安全漏洞，该漏洞源于使用PuTTY图标副本作为TELNET数据的信任指示，但代理认证和主会话之间未清除信任状态。
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
PuTTY PuTTY 0.77 ~ 0.84 -

II. Public POCs for CVE-2026-48851

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III. Intelligence Information for CVE-2026-48851

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Vendor Advisories for CVE-2026-48851 (1)

Mailing List Discussions for CVE-2026-48851 (1)

Same Patch Batch · PuTTY · 2026-05-25 · 3 CVEs total

CVE-2026-48850 3.7 LOW PuTTY 资源管理错误漏洞
CVE-2026-48852 3.7 LOW PuTTY 安全漏洞

IV. Related Vulnerabilities

Same product: PuTTY
Same vendor: PuTTY
Same weakness: CWE-451

V. Comments for CVE-2026-48851

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