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VulnerabilitiesMay 21, 2026

‼️CVE-2026-0300: PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID...

PAN-OS User-ID Authentication Portal has an unauthenticated buffer overflow vulnerability (CVE-2026-0300).

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Summary

A buffer overflow vulnerability exists in the User-ID Authentication Portal of PAN-OS, identified as CVE-2026-0300. The vulnerability can be triggered by unauthenticated users. A proof-of-concept exploit is publicly available.

Indicators of Compromise

  • cve — CVE-2026-0300

Entities

PAN-OS (product)Palo Alto (vendor)