CVE-2019-4256 Weak cryptography in API Connect

What is CVE-2019-4256?

CVE-2019-4256 is a medium-severity vulnerability in Ibm Api Connect, published on 29 May 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

IBM API Connect 5.0.0.0 through 5.0.8.6 uses weaker than expected cryptographic algorithms that could allow an attacker to decrypt highly sensitive information. IBM X-Force ID: 159944.

Weakness: CWE-326

Which versions are affected by CVE-2019-4256?

It affects 1 product.

Products include Ibm Api Connect.

How do I fix CVE-2019-4256?

No fix has been published for CVE-2019-4256 yet. Limit exposure of the affected software until one is available.

Is CVE-2019-4256 being exploited?

There is no known exploitation of CVE-2019-4256 in the wild and no public exploit code.

Other vulnerabilities in Ibm Api Connect

• CVE-2019-4202 Command injection in API Connect Critical 10.0
• CVE-2025-13915 Authentication bypass in IBM API Connect Critical 9.8
• CVE-2018-1469 Command injection in API Connect Critical 9.8
• CVE-2026-9074 IBM API Connect SQL Injection Critical 9.1
• CVE-2019-4008 Information disclosure in API Connect Critical 9.0

All Ibm Api Connect vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-234j-gj4m-9pxf.