Out-of-bounds write in Palo Alto PAN-OS - CVE-2026-0288
Published: July 10, 2026
Vulnerability identifier: #VU137301
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-0288
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Palo Alto Networks, Inc.
Affected software:
Palo Alto PAN-OS
Palo Alto PAN-OS
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service or execute arbitrary code.
The vulnerability exists due to out-of-bounds write in the User-ID Terminal Server Agent (TSA) component when handling network traffic. A remote attacker can send specially crafted network traffic to cause a denial of service or execute arbitrary code.
This issue only affects devices with at least one Terminal Server Agent entry configured. Panorama is not impacted.
How to mitigate CVE-2026-0288
Install security update from vendor's website.