HIGH

CVE-2026-45447

Heap Use-After-Free in the PKCS7_verify() Function

CVSS v3

8.8

HIGH

EPSS Score

2.3 %

exploit probability

CISA KEV

known exploited

Exploitation

none

SSVC status

Description

Microsoft Security Update (CVE-2026-45447)

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: 2026-06-19
MSRC Title: Heap Use-After-Free in the PKCS7_verify() Function

Frequently asked questions

What is CVE-2026-45447?

Microsoft Security Update (CVE-2026-45447)

Is CVE-2026-45447 actively exploited?

Active exploitation of CVE-2026-45447 has not been confirmed. The EPSS score is 2.3%, indicating the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-45447?

CVE-2026-45447 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is CVE-2026-45447 affecting your environment?

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