Security readout for executives and security teams
Plain-English summary
CVE-2026-3006 is a high-severity WinFSP flaw where a local low-privileged attacker could potentially gain system-level access. The issue is not described as remotely exploitable, and no provided source confirms active exploitation. Business urgency depends on where WinFSP is installed and whether untrusted local users can access those systems.
Executive priority
Treat as a focused high-priority patching item, not an emergency internet-wide exposure. Prioritize assets where local users, contractors, or shared operational workflows increase privilege-escalation risk.
Technical view
The CVE describes a race condition in WinFSP 2.1.25156 and lower that could trigger a kernel heap overflow and lead to local privilege escalation. CVSS 3.1 is 7.0 with local attack vector, high complexity, low privileges required, no user interaction, unchanged scope, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to systems running WinFSP 2.1.25156 or lower. Risk is higher on shared endpoints, build systems, remote desktop hosts, or other environments where low-privileged local users are present.
Exploitation context
The source bundle does not show CISA KEV listing or any cited evidence of active exploitation. Exploitation requires local access, low privileges, and high attack complexity. Successful exploitation could grant system-level access.
Researcher notes
Key constraints are local attack vector, low privileges required, high complexity, and kernel heap overflow impact. Public evidence in the bundle is limited; avoid asserting exploit availability or detailed exploitability beyond the CVE description and CVSS vector.
Mitigation direction
- Inventory WinFSP installations and identify versions 2.1.25156 or lower.
- Review WinFSP and CSA guidance for the vendor-supported fixed release.
- Upgrade affected WinFSP deployments to an unaffected vendor-supported version.
- Prioritize systems with local multi-user access or elevated business sensitivity.
- Limit local interactive access where WinFSP cannot be updated quickly.
Validation and detection
- Check installed WinFSP versions against the affected range.
- Confirm updated systems report a version above 2.1.25156 or vendor-confirmed unaffected status.
- Review endpoint inventory for unmanaged WinFSP installations.
- Validate privileged access controls on systems that still require remediation.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-362: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-368: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-3006 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H15.9CSACVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H15.9redhat-SADPVulnerability scoring details
Base CVSS 3.1 score
7HighVector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Base CVSS 3.1 score
7HighVector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- ADP timelineredhat-SADP
Made public.
- CVE publishedCVE Program
The CVE record was published.
- ADP timelineredhat-SADP
Reported to Red Hat.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2026-04-27T03:00:56.396Z: Reported to Red Hat.
- 2026-04-27T02:35:17.773Z: Made public.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2026-043CVE reference, CSA
- https://github.com/winfsp/winfsp/releases/tag/v2.2B1CVE reference, CSA
- https://access.redhat.com/security/cve/CVE-2026-3006CVE reference, redhat-SADP · vdb-entry, x_refsource_REDHAT
- RHBZ#2463150CVE reference, redhat-SADP · issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3006.jsonCVE reference, redhat-SADP · x_sadp-csaf-vex
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Context Switching Race Condition
Context Switching Race Condition represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.