CVE-2026-66795

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

0.32% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 24.2% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Awaiting Analysis. NVD last modified this record on 2026-09-01.

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

2026-08-17 20:45Z17 DAYS AGO

Last updated

2026-09-01 21:24Z2 DAYS AGO

Reserved

2026-07-27

Assigning CNA

redhat

Record state

PUBLISHED

Severity

Critical (CVSS 9.9)

CNA CVSS vector

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

Weaknesses

• CWE-295Improper Certificate ValidationBase

Data version

5.2

Document digest

6c703a9a7a1f64e4904b5d48324071016748131d395bc1210edc7797c6d2e28b

• access.redhat.comRHSA-2026:59556https://access.redhat.com/errata/RHSA-2026:59556vendor-advisoryx_refsource_REDHAT
• access.redhat.comRHSA-2026:59557https://access.redhat.com/errata/RHSA-2026:59557vendor-advisoryx_refsource_REDHAT
• access.redhat.comRHSA-2026:59558https://access.redhat.com/errata/RHSA-2026:59558vendor-advisoryx_refsource_REDHAT
• access.redhat.comRHSA-2026:59559https://access.redhat.com/errata/RHSA-2026:59559vendor-advisoryx_refsource_REDHAT
• access.redhat.comRHSA-2026:59579https://access.redhat.com/errata/RHSA-2026:59579vendor-advisoryx_refsource_REDHAT
• access.redhat.comRHSA-2026:59593https://access.redhat.com/errata/RHSA-2026:59593vendor-advisoryx_refsource_REDHAT
• access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-66795vdb-entryx_refsource_REDHAT
• bugzilla.redhat.comRHBZ#2507540https://bugzilla.redhat.com/show_bug.cgi?id=2507540issue-trackingx_refsource_REDHAT