CVE-2026-0300

Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability

Added to CISA KEV: 2026-05-06

By FixTheVuln Team Sources: CISA KEV Catalog, NVD
CVSS 9.3 — CRITICAL ACTIVE
CWE-787

Description

Palo Alto Networks PAN-OS contains an out-of-bounds write vulnerability in the User-ID Authentication Portal (aka...

Required Action

Fix: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Until the vendor releases an official fix, the following workaround should be implemented: - Restrict User-ID Authentication Portal access to only trusted zones. - Disable User-ID Authentication Portal if not required.

References

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Frequently Asked Questions

What is CVE-2026-0300?

CVE-2026-0300 (Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability) is a vulnerability with a CVSS score of 9.3 (CRITICAL). Palo Alto Networks PAN-OS contains an out-of-bounds write vulnerability in the User-ID Authentication Portal (aka...

How do I fix CVE-2026-0300?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Until the vendor releases an official fix, the following workaround should be implemented: - Restrict User-ID Authentication Portal access to only trusted zones. - Disable User-ID Authentication Portal if not required.

How severe is CVE-2026-0300?

CVE-2026-0300 has a CVSS score of 9.3, classified as CRITICAL. This vulnerability is in the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been actively exploited in the wild.

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