Vulnerability Snapshot
CVE-2026-0300 is rated CRITICAL — exploitation is trivial or already observed in the wild and impact is severe. Patch immediately, not on the next maintenance window.
Affected technology: PAN-OS.
Executive Summary
CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2026-0300 Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability This type of vulnerability is a frequent attack vector for malicious cyber actors and poses significant risks to the federal enterprise. Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities established the KEV Catalog
Source
How Vulnios Detects This
Vulnios scans for this vulnerability using Trivy and Grype for SBOM-based CVE matching and Vulnios CVE feed continuous monitoring against your asset inventory. Run a scan against your environment to see whether you are exposed; findings are linked back to the original CVE record so triage starts with the patch path already known.
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Affected Products
Related Threat Alerts
- Rapid7 Blog Advisory — May 6, 2026
- Palo Alto Networks warns of firewall RCE zero-day exploited in attacks
- Palo Alto PAN-OS Flaw Under Active Exploitation Enables Remote Code Execution
- Palo Alto Networks to Patch Zero-Day Exploited to Hack Firewalls
- Cybersecurity M&A Roundup: 33 Deals Announced in April 2026
- AI Can Autonomously Hack Cloud Systems With Minimal Oversight: Researchers
Frequently Asked Questions
What is CVE-2026-0300?
CVE-2026-0300 is a critical-severity vulnerability tracked under the Common Vulnerabilities and Exposures program. CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2026-0300 Palo Alto Networks PAN-OS Out-of-bounds Write Vulnera
Am I affected?
Check whether your environment runs PAN-OS. If you operate any of those, treat yourself as in scope until you have evidence otherwise. A Vulnios scan will identify the exact assets carrying the affected version.
How urgent is the response?
Critical: do not wait for your normal patch cycle. Verify exposure today, apply the vendor patch immediately, and add detection rules for any post-exploit indicators.
How do I remediate?
Apply the vendor patch listed in the upstream advisory linked under Sources. If the patch is not yet available, follow the vendor-supplied workaround (often a config flag or feature disable) and add detections for the published exploit pattern in your SIEM. Re-scan after the patch lands to confirm the finding clears.
Where can I track exploitation activity?
Watch CISA's Known Exploited Vulnerabilities catalog for CVE-2026-0300. Cross-reference with public exploit databases and your own SIEM/IDS for indicator-of-compromise patterns. Vulnios tracks KEV status automatically and surfaces it on the asset findings view.
How does Vulnios help with this?
Vulnios continuously cross-references your asset inventory against the live CVE feed (NVD, vendor advisories, CISA KEV, and curated OSINT). When a new CVE matches your environment, you get a prioritized finding with the severity, KEV status, exploit-prediction (EPSS), and a direct path to the vendor patch. You can start a free scan from the homepage.
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