# CVE-2026-102203: RPC Runtime type confusion remote code execution

Source: https://junglewise.ai/threats/cve-2026-102203-access-of-resource-using-incompatible-type-type-confusion-in-rpc  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-102203 · Severity: high · CVSS 8.8 · Published 2026-10-13

A type confusion flaw in the RPC Runtime allows an attacker on the network to execute arbitrary code without authentication. This could enable complete compromise of affected systems, leading to data theft, system takeover, or use as a pivot point for further attacks.

Technologies: [Microsoft RPC Runtime](https://junglewise.ai/threats/technologies/rpc-runtime). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-102203 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-102203 being exploited in the wild.

**How severe is CVE-2026-102203?** High severity, with a CVSS score of 8.8, published 13 October 2026.

**Which products and versions are affected?** Microsoft RPC Runtime.

**Is there a fix for CVE-2026-102203?** 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-2026-102203 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-102203?** Check whether you run Microsoft RPC Runtime. 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 type confusion vulnerability in the RPC Runtime allows remote code execution through the network attack vector. The flaw permits an unauthenticated attacker to send specially crafted RPC requests that trigger unsafe type casting, resulting in arbitrary code execution with the privileges of the RPC service.

## Affected products

- Microsoft RPC Runtime

## Timeline

- 2026-10-13: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102203](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102203)

## Related threats

- [Microsoft RPC Runtime untrusted pointer dereference](https://junglewise.ai/threats/cve-2026-88219-untrusted-pointer-dereference-in-rpc-runtime-allows-an)
- [Microsoft RPC Runtime out-of-bounds write](https://junglewise.ai/threats/cve-2026-83910-out-of-bounds-write-in-rpc-runtime-allows-an-unauthorized)