CVE intelligence

CVE-2026-89156

Vulnerability intelligence

Published Sep 11, 2026Sources checked Oct 28, 2026

5.9MEDIUMCVSS out of 10

What this means

Review the available evidence

CVE-2026-89156 and is rated Medium severity with a CVSS score of 5.9. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: Sep 29, 2026

See the Microsoft Security Update Guide for the update that applies to your product.

Vendor-listed releases

10.48-1

CISA KEVNot listedBased on the latest collected catalog

EPSS0.3%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-89156?

PCRE2 before 10.48 has a pcre2_match out-of-bounds read after a JIT fallback when an attacker can provide invalid UTF data.

Source: NVD