CVE-2026-93689

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.15% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 4.4% of scored records. A rank, not a probability.

NVD base score

6.8 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Awaiting Analysis. NVD last modified this record on 2026-09-22.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-09-18 15:06Z1 MO AGO

Last updated

2026-09-24 14:23Z1 MO AGO

Reserved

2026-09-18

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

Medium (CVSS 6.8)

CNA CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Weaknesses

• CWE-476NULL Pointer DereferenceBase

Data version

5.2

Document digest

de6534c94655f0de8d60a72b8d7f759e87e122c818e84bf3b2500325ece1ae01

• github.comPatch Commithttps://github.com/winfsp/winfsp/commit/b8103265ec63fa87ac264c62bb796dbc38376652patch
• github.comhttps://github.com/winfsp/winfspproduct
• github.comhttps://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/devctl.c#L68-L73technical-description
• github.comhttps://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/devctl.c#L105-L114technical-description
• github.comhttps://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/devctl.c#L146-L152technical-description
• github.comhttps://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/volume.c#L1059-L1060technical-description
• github.comwinfsp v2.2B4 Release Noteshttps://github.com/winfsp/winfsp/releases/tag/v2.2B4release-notes
• www.vulncheck.comVulnCheck Advisory: WinFsp through 2.2.26215 NULL Pointer Dereference via Fast I/Ohttps://www.vulncheck.com/advisories/winfsp-through-2.2.26215-null-pointer-dereference-via-fast-i-othird-party-advisory