Tenable disclosed a critical path traversal vulnerability, tracked as CVE-2026-15265, affecting Tenable/Nessus Agent on Linux, Windows, and macOS. The flaw allows a privileged attacker to write arbitrary files outside the intended plugin directory, creating a path to remote code execution. The issue affects version 11.2.0 and 11.1.3 and earlier, and has been classified under CWE-22 and CWE-347 with high impact to confidentiality, integrity, and availability.
Tenable released fixes in versions 11.2.1 and 11.1.4, and the Canadian Centre for Cyber Security issued advisory AV26-705 urging organizations to review Tenable’s guidance and apply updates. CISA enrichment cited in vulnerability tracking data indicates no known exploitation so far, but assessed the technical impact as total, reinforcing the need for rapid patching across exposed agent deployments.

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3 events from the most recent confirmed update back to the earliest known activity.
The Canadian Centre for Cyber Security published advisory AV26-705 highlighting Tenable's July 14 advisory and urging users and administrators to review it and apply updates. The notice identified the issue as a critical path traversal vulnerability affecting Nessus Agent.
CISA added Stakeholder-Specific Vulnerability Categorization data for CVE-2026-15265 on July 14, 2026. The entry indicated no known exploitation, non-automatable exploitation, and total technical impact.
Tenable published a security advisory on July 14, 2026 for a critical path traversal vulnerability affecting Nessus Agent/Tenable Agent. The flaw affects version 11.2.0 and earlier and 11.1.3 and earlier, and fixed versions 11.2.1 and 11.1.4 were made available.
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