PT-2026-32753 · Microsoft · Windows Client Side Caching Driver+1

Chengbin Wang · Published 2026-04-14 · Updated 2026-04-17 · CVE-2026-26176

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

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

Name of the Vulnerable Software and Affected Versions Windows Client Side Caching driver (csc.sys) (affected versions not specified)

Description A heap-based buffer overflow in the Windows Client Side Caching driver (csc.sys) allows an authorized attacker to elevate privileges locally. A heap-based buffer overflow occurs when an application writes more data to a heap-allocated memory block than it can hold, potentially leading to arbitrary code execution or system crashes.

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

LPE

Heap Based Buffer Overflow

Weakness Enumeration

CWE-122

Related Identifiers

BDU:2026-05340

CVE-2026-26176

Affected Products

Windows

Windows Client Side Caching Driver

References · 7

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26176 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-26176 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-26176 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-26176 · Security Note
• https://bdu.fstec.ru/vul/2026-05340 · Security Note
• https://twitter.com/CVEnew/status/2044358615159427118 · Twitter Post
• https://twitter.com/cbwang505/status/2044972193717879045 · Twitter Post