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CVE-2026-0288 is a high-severity memory corruption vulnerability affecting the User-ID Terminal Server Agent (TSA) component in Palo Alto Networks PAN-OS. The issue is described as multiple buffer overflow vulnerabilities, including an out-of-bounds write condition, in code that processes network traffic destined for the TSA service. An unauthenticated attacker with network access to the exposed TSA IP and port can send specially crafted traffic to trigger memory corruption. Successful exploitation can crash the affected service or device and may potentially lead to arbitrary code execution. The vulnerability affects PAN-OS deployments only when at least one Terminal Server Agent entry is configured. Panorama is not affected, and Cloud NGFW on AWS is also reported as not affected.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
23 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A PAN-OS User-ID TSA vulnerability that allows unauthenticated denial of service and possible code execution.
A PAN-OS User-ID TSA vulnerability that allows unauthenticated denial of service and possible code execution.
An out-of-bounds write vulnerability in the Palo Alto Networks User-ID Terminal Server Agent component that could allow a remote attacker to cause a denial of service or potentially execute arbitrary code.
A high-severity PAN-OS vulnerability involving multiple buffer overflows that can allow an unauthenticated network attacker to cause denial of service and potentially achieve arbitrary code execution against Palo Alto firewalls.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.