CVE-2026-4942 IBM i is Affected by Algorithm Downgrade in Transport Layer Security []
Remote attackers can downgrade TLS protocol versions on IBM i systems, bypassing security configurations intended to disable weaker protocols.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4942?
CVE-2026-4942 is a medium-severity vulnerability in Ibm I, published on 17 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-757
Which versions are affected by CVE-2026-4942?
It affects 1 product.
Products include Ibm I.
How do I fix CVE-2026-4942?
No fix has been published for CVE-2026-4942 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-4942 being exploited?
There is no known exploitation of CVE-2026-4942 in the wild and no public exploit code.
Other vulnerabilities in Ibm I
- CVE-2026-96119 IBM i is Affected By An Improper Control of Code Generation Vulnerability in HTTP Server Administration GUI
- CVE-2026-16860 IBM i is Affected By Remote Code Execution Vulnerability []
- CVE-2026-17083 IBM i is Affected By Multiple Vulnerabilities in the Debug Server
- CVE-2026-17218 IBM i is Affected By Remote Code Execution Vulnerability in Line Printer Daemon []
- CVE-2026-17276 IBM i is Affected By Multiple Vulnerabilities in Navigator for i
Sources
Also known as GHSA-cffx-9q2g-r6hp.