CVE-2026-0257 · netVigilance record NV26-0123
Palo Alto Networks PAN-OS Authentication Bypass
past due ransomware
What to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA deadline 2026-06-01 · passed 3 months ago · applies to US federal civilian agencies; used elsewhere as a reference SLA
What happened
Palo Alto Networks PAN-OS contains an authentication bypass vulnerability that allows attackers to bypass security restrictions and establish an unauthorized VPN connection.
Who is affected
Palo Alto Networks PAN-OS. Affected version ranges are listed in the vendor advisory and the NVD entry linked under Sources.
Weakness class: CWE-565.
Timeline
- Added to CISA KEVExploitation in the wild confirmed by CISA
- CISA remediation deadlinepassed 3 months ago
Sources
- NVD entry for CVE-2026-0257 nvd.nist.gov/vuln/detail/CVE-2026-0257
- CISA Known Exploited Vulnerabilities catalog www.cisa.gov/known-exploited-vulnerabilities-catalog
- security.paloaltonetworks.com security.paloaltonetworks.com/CVE-2026-0257
- nvd.nist.gov nvd.nist.gov/vuln/detail/CVE-2026-0257