CVE-2026-17467: IBM Cloud Pak Weak Cryptography Vulnerability

CVE-2026-17467 Overview

CVE-2026-17467 affects IBM Cloud Pak for Data System (Yosemite 1.0) version 3.0.5.2. The product uses weak or deprecated cryptographic protocols, which could allow a remote attacker to obtain sensitive information from network communications. The weakness is classified under CWE-327: Use of a Broken or Risky Cryptographic Algorithm.

Critical Impact
A network-based attacker can intercept or decrypt confidential data exchanged with the affected system without requiring authentication or user interaction.

Affected Products

IBM Cloud Pak for Data System (Yosemite 1.0)
Version 3.0.5.2
Deployments relying on the platform's default cryptographic configuration

Discovery Timeline

2026-09-14 - CVE-2026-17467 published to the National Vulnerability Database (NVD)
2026-09-16 - Last updated in NVD database

Technical Details for CVE-2026-17467

Vulnerability Analysis

The vulnerability stems from IBM Cloud Pak for Data System accepting weak or deprecated cryptographic protocols during network communication. Protocols such as SSLv3, TLS 1.0, or TLS 1.1 and outdated cipher suites do not provide sufficient confidentiality guarantees. An attacker positioned on the network can leverage known cryptographic weaknesses to decrypt captured traffic.

The issue is exploitable remotely without authentication or user interaction. Because the flaw resides in the transport layer, any sensitive data in transit including credentials, tokens, and business data may be exposed. Integrity impact is limited, but confidentiality loss is significant for enterprise workloads running on the platform.

Root Cause

The root cause is the platform's continued support for cryptographic algorithms and protocol versions that no longer meet modern security requirements. This is a classic [CWE-327] weakness where downgrade attacks, cipher substitution, or known plaintext attacks become feasible against captured sessions.

Attack Vector

Exploitation requires network access to the target system. An attacker performs a man-in-the-middle position on the communication path or captures ciphertext for offline analysis. By forcing negotiation of the weakest supported protocol or cipher, the attacker recovers plaintext from session data. See the IBM Support Document for vendor guidance.

No verified public exploit code is available for this vulnerability. The mechanism follows the well-documented pattern of downgrade attacks against legacy TLS implementations.

Detection Methods for CVE-2026-17467

Indicators of Compromise

TLS handshakes negotiating SSLv3, TLS 1.0, or TLS 1.1 with the Cloud Pak for Data System endpoint
Cipher suites containing RC4, 3DES, MD5, or export-grade key exchange in session logs
Repeated protocol downgrade attempts from a single source address

Detection Strategies

Inspect TLS traffic to and from Cloud Pak for Data System nodes using a network sensor that logs negotiated protocol version and cipher suite
Correlate application access logs with TLS metadata to identify sessions established over deprecated protocols
Run periodic external scans with tools such as nmap --script ssl-enum-ciphers or testssl.sh against exposed endpoints

Monitoring Recommendations

Alert on any TLS session negotiated below TLS 1.2 against affected systems
Track certificate and cipher suite inventory changes across the Cloud Pak deployment
Forward TLS negotiation telemetry into a centralized data lake for retrospective hunting

How to Mitigate CVE-2026-17467

Immediate Actions Required

Apply the fix referenced in the IBM Support Document for Cloud Pak for Data System (Yosemite 1.0) 3.0.5.2
Inventory all Cloud Pak for Data System nodes and confirm which accept deprecated TLS versions
Restrict network exposure of management and data interfaces to trusted segments until patched

Patch Information

IBM has published remediation guidance in support document node/7286491. Administrators should follow the vendor advisory to update the affected components and reconfigure TLS settings. Verify post-patch that only TLS 1.2 or TLS 1.3 with modern cipher suites are accepted.

Workarounds

Disable SSLv3, TLS 1.0, and TLS 1.1 at the platform and load-balancer layer
Remove RC4, 3DES, EXPORT, and NULL ciphers from the allowed cipher list
Enforce HTTP Strict Transport Security (HSTS) on web-facing services fronting Cloud Pak for Data System
Terminate TLS at a hardened reverse proxy that enforces modern cryptographic policy

bash

# Configuration example: restrict a reverse proxy in front of Cloud Pak for Data System
# nginx snippet enforcing TLS 1.2+ and modern ciphers
ssl_protocols TLSv1.2 TLSv1.3;
ssl_ciphers ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305;
ssl_prefer_server_ciphers on;
add_header Strict-Transport-Security "max-age=63072000; includeSubDomains" always;