MEDIUM

CVE-2026-31789

Heap Buffer Overflow in Hexadecimal Conversion

CVSS v3

7.3

MEDIUM

EPSS Score

0.0 %

exploit probability

CISA KEV

known exploited

Exploitation

none

SSVC status

Description

Microsoft Security Update (CVE-2026-31789)

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Published: 2026-05-07
MSRC Title: Heap Buffer Overflow in Hexadecimal Conversion

Frequently asked questions

What is CVE-2026-31789?

Microsoft Security Update (CVE-2026-31789)

Is CVE-2026-31789 actively exploited?

Active exploitation of CVE-2026-31789 has not been confirmed. The EPSS score is 0.0%, indicating the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-31789?

CVE-2026-31789 has a CVSS v3 base score of 7.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

Is CVE-2026-31789 affecting your environment?

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