CVE-2026-4740

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.15% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 4.6% of scored records. A rank, not a probability.

NVD base score

8.2 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-08-25.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-04-07 14:30Z4 MO AGO

Last updated

2026-08-25 12:05Z10 DAYS AGO

Reserved

2026-03-24

Assigning CNA

redhat

Record state

PUBLISHED

Severity

High (CVSS 8.2)

CNA CVSS vector

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Weaknesses

• CWE-295Improper Certificate ValidationBase

Data version

5.2

Document digest

170789357510861ba6f96182b0532ebc0a423c35bb086003e2a30a74e803f842

• access.redhat.comRHSA-2026:11414https://access.redhat.com/errata/RHSA-2026:11414vendor-advisoryx_refsource_REDHAT
• access.redhat.comRHSA-2026:13542https://access.redhat.com/errata/RHSA-2026:13542vendor-advisoryx_refsource_REDHAT
• access.redhat.comRHSA-2026:13853https://access.redhat.com/errata/RHSA-2026:13853vendor-advisoryx_refsource_REDHAT
• access.redhat.comRHSA-2026:8218https://access.redhat.com/errata/RHSA-2026:8218vendor-advisoryx_refsource_REDHAT
• access.redhat.comRHSA-2026:9848https://access.redhat.com/errata/RHSA-2026:9848vendor-advisoryx_refsource_REDHAT
• access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-4740vdb-entryx_refsource_REDHAT
• blog.arfevrier.frhttps://blog.arfevrier.fr/open-cluster-management-cross-cluster-escape/
• bugzilla.redhat.comRHBZ#2450590https://bugzilla.redhat.com/show_bug.cgi?id=2450590issue-trackingx_refsource_REDHAT
• security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4740.jsonx_sadp-csaf-vex