CVE-2026-40958
LowCVSS 3.7Exploitation Probability (EPSS)
Low risk31th percentile - higher than 31% of all known CVEs
Summary
CVE-2026-40958 is an input validation error in Secure Access clients prior to 14.55. Attackers with intimate knowledge of and total control over the tunnel protocol can create a non-persistent DoS against their client.
Risk Assessment
The risk is that a privileged attacker can trigger a DoS attack, potentially disrupting the Secure Access client and affecting service availability.
Recommendation
It is recommended to upgrade Secure Access clients to version 14.55 or later, which includes a fix for the input validation error.
Other vulnerabilities in Secure Access
See all- CVE-2026-116768High
CVE-2026-116768 is a missing length validation vulnerability in Secure Access servers prior to 14.61. An authenticated attacker can cause a persistent denial of service when connecting for the first time.
- CVE-2026-116767High
CVE-2026-116767 is an improper input handling vulnerability in Secure Access servers prior to 14.61. An authenticated attacker can cause a persistent denial of service.
- CVE-2026-116766High
CVE-2026-116766 is an improper input handling vulnerability in Secure Access server versions between 13.0 and prior to 14.61. An attacker can cause a persistent denial of service of the server.
- CVE-2026-97717Medium
CVE-2026-97717 is a vulnerability in the proxy sub-system of Secure Access servers prior to 14.60. Authenticated attackers can send malformed data to the server and cause a persistent denial of service.
- CVE-2026-97716High
CVE-2026-97716 is a vulnerability in the connection set up sub-system of Secure Access servers prior to version 14.60. Unauthenticated attackers can send specially crafted traffic to the server and cause a persistent denial of service.
- CVE-2026-97715High
Vulnerability in the client registration process of Secure Access servers prior to version 14.60. Authenticated attackers can pass malformed data to the server and cause a persistent denial of service.
- CVE-2026-97714High
Vulnerability in the authentication sub-system of Secure Access servers prior to version 14.60. Attackers can send a malformed response during authentication and cause a persistent denial of service.
- CVE-2026-55402Medium
CVE-2026-55402 is an out of bounds read vulnerability in Secure Access servers prior to version 14.57. Attackers with an 'in the middle' position can send specially crafted data to a server causing a persistent denial of service.
- CVE-2026-55401Medium
CVE-2026-55401 is a null dereference vulnerability in the load-balancing subsystem of Secure Access servers prior to 14.57. Attackers can send an unauthenticated packet to a Secure Access server with load balancing enabled, which results in the internal load balancer crashing. After a successful attack, the Secure Access server is still able to accept connections and is still able to issue a failover to connected clients.
- CVE-2026-55400Medium
CVE-2026-55400 is an integer underflow in Secure Access servers prior to version 14.57. Attackers with an authenticated session can send specially crafted traffic to a server in a non-default configuration and cause a persistent denial of service.
Original NVD description (English source)
CVE-2026-40958 is a input validation error in Secure Access clients prior to 14.55. Attackers with intimate knowledge of and total control over the tunnel protocol can create a non-persistent DoS against their client.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

