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CVE-2026-4942— IBM i is Affected by Algorithm Downgrade in Transport Layer Security []

Quick assessment

Affected
IBM i
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.

IBM i是美国IBM公司的一个国产服务器操作系统。 IBM i存在加密问题漏洞，该漏洞源于选择明文算法（CWE-757），可能导致远程攻击者发送特制消息并降级传输层安全性协议（TLS）到服务器配置中禁用的版本。

CVSS 5.9 · Medium EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 4

VendorProduct Version RangeStatus
IBM i 7.6 affected
7.5 affected
7.4 affected
7.3 affected
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I. Basic Information for CVE-2026-4942

Vulnerability Information
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Vulnerability Title
IBM i is Affected by Algorithm Downgrade in Transport Layer Security []
Source: CVE Program / CVE List V5
Vulnerability Description
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to send a specifically crafted message and downgrade the Transport Layer Security (TLS) protocol to a version disabled in the server configuration.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在会话协商时选择低安全性的算法(算法降级)
Source: CVE Program / CVE List V5
Vulnerability Title
IBM i 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
IBM i是美国IBM公司的一个国产服务器操作系统。 IBM i存在加密问题漏洞，该漏洞源于选择明文算法（CWE-757），可能导致远程攻击者发送特制消息并降级传输层安全性协议（TLS）到服务器配置中禁用的版本。
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
IBM i 7.6 cpe:2.3:a:ibm:i:7.6:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-4942

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III. Intelligence Information for CVE-2026-4942

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Vendor Advisories for CVE-2026-4942 (1)

Same Patch Batch · IBM · 2026-07-17 · 34 CVEs total

CVE-2026-8476 9.9 CRITICAL Disk Cache Deserialization Remote Code Execution Vulnerability
CVE-2026-8481 9.9 CRITICAL Remote Code Execution via Code Validation Endpoint
CVE-2026-8635 9.9 CRITICAL Arbitrary Code Execution in Python Interpreter Component
CVE-2026-9135 9.9 CRITICAL Policies Component Dynamic CodeInput Fields Bypass Custom Component Validation
CVE-2026-8859 9.9 CRITICAL Path Traversal in APIRequest Component via Content-Disposition Header
CVE-2026-13446 9.8 CRITICAL Langflow is affected by remote code execution, denial of service, path traversal, and expo
CVE-2026-8505 9.8 CRITICAL Authentication Bypass in Webhook Endpoints Allowed Unauthorized Flow Execution
CVE-2026-9202 9.8 CRITICAL Unauthenticated User Registration Could Lead to Remote Code Execution
CVE-2026-9198 9.8 CRITICAL Unauthenticated Remote Code Execution via Auto-Login Bypass and Code Validation
CVE-2026-9103 9.8 CRITICAL Unauthenticated Superuser Token Issuance via Auto-Login Endpoint
CVE-2026-15091 9.3 CRITICAL Multiple Vulnerabilities in IBM Engineering AI hub.
CVE-2026-14499 8.8 HIGH Langflow is affected by remote code execution, denial of service, path traversal, and expo
CVE-2026-7667 8.8 HIGH Path Traversal Vulnerability in API Request Component Content-Disposition Header Processin
CVE-2026-7755 8.8 HIGH MCP Server Configuration Validator Bypass via File Upload API
CVE-2026-8056 8.8 HIGH Parameter Injection Vulnerability in API Graph Execution Engine
CVE-2026-13445 8.1 HIGH Langflow is affected by remote code execution, denial of service, path traversal, and expo
CVE-2026-13473 8.1 HIGH IBM Storage Protect Client is vulnerable to Heap-Based Buffer Overflow
CVE-2026-13448 8.1 HIGH Langflow is affected by remote code execution, denial of service, path traversal, and expo
CVE-2026-9762 7.8 HIGH IBM® Data Server driver for JDBC and SQLJ is vulnerable to remote code execution when jdbc
CVE-2026-7754 7.7 HIGH SSRF Protection Configuration Vulnerability

Showing top 20 of 34 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: i
Same vendor: IBM
Same weakness: CWE-757

V. Comments for CVE-2026-4942

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