CVE-2026-4942: IBM i is Affected by Algorithm Downgrade in Transport Layer Security []
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.
Other sources
IBM i 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.
— IBM
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
IBM ito a version that resolves this vulnerability.Fixed in 7.6Patch MJ09141 - Upgrade
Upgrade
IBM ito a version that resolves this vulnerability.Fixed in 7.5Patch MJ09140 - Upgrade
Upgrade
IBM ito a version that resolves this vulnerability.Fixed in 7.4Patch MJ09139 - Upgrade
Upgrade
IBM ito a version that resolves this vulnerability.Fixed in 7.3Patch MJ09138
Event History
Frequently Asked Questions
What is the severity of CVE-2026-4942?
The severity of CVE-2026-4942 is rated as medium with a score of 5.9.
How can I fix CVE-2026-4942?
To fix CVE-2026-4942, ensure that the server configuration does not allow downgrading the TLS protocol and apply any available patches from IBM.
What impact does CVE-2026-4942 have on IBM i systems?
CVE-2026-4942 can allow a remote attacker to downgrade the TLS protocol, potentially exposing sensitive information.
Which versions of IBM i are affected by CVE-2026-4942?
CVE-2026-4942 affects IBM i versions 7.6, 7.5, 7.4, and 7.3.
Is user interaction required to exploit CVE-2026-4942?
No, user interaction is not required to exploit CVE-2026-4942 as it can be initiated remotely by an attacker.