MEDIUM

CVE-2026-42766

Possible NULL Dereference in Password-Based CMS Decryption

CVSS v3

5.9

MEDIUM

EPSS Score

0.6 %

exploit probability

CISA KEV

known exploited

Exploitation

none

SSVC status

Description

Microsoft Security Update (CVE-2026-42766)

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2026-06-19
MSRC Title: Possible NULL Dereference in Password-Based CMS Decryption

Frequently asked questions

What is CVE-2026-42766?

Microsoft Security Update (CVE-2026-42766)

Is CVE-2026-42766 actively exploited?

Active exploitation of CVE-2026-42766 has not been confirmed. The EPSS score is 0.6%, indicating the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-42766?

CVE-2026-42766 has a CVSS v3 base score of 5.9 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

Is CVE-2026-42766 affecting your environment?

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