PT-2026-40112 · Microsoft · Windows Rich Text Edit+1

Published 2026-05-12 · Updated 2026-05-15 · CVE-2026-21530

Positive Technologies (AI Summary)

CVSS v3.1

6.7

Medium

Base vector

AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Windows Rich Text Edit (affected versions not specified)

Description A double free issue in Windows Rich Text Edit allows an authorized attacker to elevate privileges locally. A double free occurs when a program attempts to free the same memory location twice, which can lead to memory corruption.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Double Free

Weakness Enumeration

CWE-415

Related Identifiers

BDU:2026-06741

CVE-2026-21530

Affected Products

Windows

Windows Rich Text Edit

References · 8

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21530 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-21530 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21530 · Security Note
• https://bdu.fstec.ru/vul/2026-06741 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-21530 · Security Note
• https://twitter.com/windowsforum/status/2054255845064478835 · Twitter Post
• https://twitter.com/f1tym1/status/2055171261446214066 · Twitter Post
• https://t.me/cveNotify/163459 · Telegram Post