CVE-2026-0300
Actively exploited. CVE-2026-0300 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-05-06) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2026-0300 is indexed in GitHub PoC. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
On 6 May 2026, Palo Alto published a security advisory addressing a critical vulnerability affecting PAN-OS. This vulnerability allows an unauthenticated attacker to execute arbitrary code with root privileges. Palo Alto observed limited exploitation of this vulnerability. It is strongly recommended updating affected appliances as soon as patches will be available, and to apply workarounds and mitigation in the meantime.
CSIRTS triage
- What
- An unauthenticated buffer overflow vulnerability exists in the User-ID Authentication Portal.
- Who is affected
- Deployments of PAN-OS are affected.
- Urgency
- Remediation is critical due to active exploitation and critical severity.
- Action
- Upgrade to the patched version of PAN-OS.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 98% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2026-0300 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
Advisory coverage (3)
- criticalexploitedCVE-2026-0300 PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID™ Authentication …paloalto · 2026-05-28
- critical2026-006: Critical Vulnerability in PAN-OScert-eu · 2026-05-06
- criticalexploitedCVE-2026-0300: Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerabilitycisa-kev · 2026-05-06
External references
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