CVE-2026-55398 is a memory management vulnerability in Absolute Security Secure Access software versions before 14.55. Exploitation requires an attacker to have intimate knowledge of and total control over the tunnel protocol, enabling them to trigger a non-persistent denial-of-service condition on the server. The vulnerability relates to improper resource handling (CWE-400) and potentially unsafe memory operations (CWE-119). No known exploits are reported in the wild, and no official remediation level or patch information is currently provided.

Successful exploitation results in a non-persistent denial-of-service against the Secure Access server, potentially disrupting service availability. There is no indication of privilege escalation, data confidentiality loss, or integrity compromise. The attack requires no privileges or user interaction but does require detailed protocol control by the attacker.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or remediation level is provided, monitor Absolute Security's advisories for updates. Until a patch is available, restrict access to the tunnel protocol to trusted entities to reduce the risk of exploitation.