# CVE-2026-112794: Windows Smart Card heap-based buffer overflow

Source: https://junglewise.ai/threats/cve-2026-112794-heap-based-buffer-overflow-in-windows-smart-card-allows-an  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-112794 · Severity: high · CVSS 7.8 · Published 2026-11-10

A heap-based buffer overflow exists in Windows Smart Card, a system component that manages smart card authentication and identification. An authorized local attacker can exploit this flaw to escalate their privileges and gain elevated access to the system.

Technologies: [Microsoft Windows Smart Card](https://junglewise.ai/threats/technologies/windows-smart-card). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-112794 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-112794 being exploited in the wild.

**How severe is CVE-2026-112794?** High severity, with a CVSS score of 7.8, published 10 November 2026.

**Which products and versions are affected?** Microsoft Windows Smart Card.

**Is there a fix for CVE-2026-112794?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-112794 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-112794?** Check whether you run Microsoft Windows Smart Card. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A heap-based buffer overflow in the Windows Smart Card component allows a locally authenticated attacker to write data beyond allocated buffer boundaries. The vulnerability requires prior authorization (local access) and enables privilege escalation. Microsoft has released a security update to patch this flaw.

## Affected products

- Microsoft Windows Smart Card

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-112794](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-112794)

## Related threats

- [Microsoft Windows Smart Card privilege escalation](https://junglewise.ai/threats/cve-2026-119383-use-of-uninitialized-resource-in-windows-smart-card-allows-an)
- [Microsoft Windows Smart Card heap buffer overflow](https://junglewise.ai/threats/cve-2026-118144-heap-based-buffer-overflow-in-windows-smart-card-allows-an)
- [Microsoft Windows Smart Card privilege escalation via untrusted search path](https://junglewise.ai/threats/cve-2026-69785-microsoft-windows-smart-card-privilege-escalation-via-untrusted)