ZDI-26-622: Microsoft Windows IKEv2 AES-GCM Decryption Integer Underflow Remote Code Execution Vulnerability

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Sep 8, 2026 · Catalog

   Detected

   This vulnerability allows remote attackers to execute arbitrary code on affected installations of Microsoft Windows. Authentication is not required to exploit this vulnerability, but only systems with specific IPsec configurations are vulnerable. The ZDI has assigned a CVSS rating of 8.1. The following CVEs are assigned: CVE-2026-50696.

Sources

• CVE.orgVulnerability recordCVE-2026-50696

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-50696

  30-day exploitation probability 1.2%

  first.org
• Zero Day InitiativeCoordinated disclosureZDI-26-622

  This vulnerability allows remote attackers to execute arbitrary code on affected installations of Microsoft Windows. Authentication is not required to exploit this vulnerability, but only systems with specific IPsec configurations are vulnerable. The ZDI has assigned a CVSS rating of 8.1. The following CVEs are assigned: CVE-2026-50696.

  zerodayinitiative.com