CVE-2026-4942
IBM i is Affected by Algorithm Downgrade in Transport Layer Security []
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.
INFO
Published Date :
July 17, 2026, 8:17 p.m.
Last Modified :
Aug. 12, 2026, 7 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 9a959283-ebb5-44b6-b705-dcc2bbced522 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Configure server to disable older TLS versions.
- Apply vendor updates for IBM i.
- Disable weak cipher suites.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-4942.
| URL | Resource |
|---|---|
| https://www.ibm.com/support/pages/node/7278992 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-4942 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-4942
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-4942 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-4942 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Aug. 12, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Added CPE Configuration OR *cpe:2.3:o:ibm:i:7.3:*:*:*:*:*:*:* *cpe:2.3:o:ibm:i:7.4:*:*:*:*:*:*:* *cpe:2.3:o:ibm:i:7.5:*:*:*:*:*:*:* *cpe:2.3:o:ibm:i:7.6:*:*:*:*:*:*:* Added Reference Type IBM Corporation: https://www.ibm.com/support/pages/node/7278992 Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 20, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-4942', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-20T13:52:40.695670Z'} -
New CVE Received by [email protected]
Jul. 17, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:2.3:a:ibm:i:7.6:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.6.0:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.5:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.5.0:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.4:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.4.0:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.3:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.3.0:*:*:*:*:*:*:*'], 'vendor': 'IBM', 'product': 'i', 'versions': [{'status': 'affected', 'version': '7.6'}, {'status': 'affected', 'version': '7.5'}, {'status': 'affected', 'version': '7.4'}, {'status': 'affected', 'version': '7.3'}]}] Added 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. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Added CWE CWE-757 Added Reference https://www.ibm.com/support/pages/node/7278992