CVE-2026-40953 Heap overflow in Secure Access clients
Local administrators can cause a denial of service in Secure Access clients via a heap overflow in certificate parsing.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-40953?
CVE-2026-40953 is a medium-severity memory corruption vulnerability in Absolute Secure Access, published on 15 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
CVE-2026-40953 is a heap overflow in the certificate parsing function of Secure Access clients prior to 14.55. Attackers with local access and administrator permissions can create a denial of service attack against the client over which they have control.
Weakness: CWE-787
Which versions are affected by CVE-2026-40953?
It affects 1 product.
Products include Absolute Secure Access.
How do I fix CVE-2026-40953?
No fix has been published for CVE-2026-40953 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-40953 being exploited?
There is no known exploitation of CVE-2026-40953 in the wild and no public exploit code.
Other vulnerabilities in Absolute Secure Access
- CVE-2026-55402 Denial of service in Secure Access
- CVE-2026-33445 Memory management vulnerability in Secure Access servers
- CVE-2025-49080 Memory management vulnerability in Absolute Secure Access server versions 9.0 to 13.54
- CVE-2026-40952 Privilge misconfiguration in Secure Access installers
- CVE-2026-33451 Arbitrary read/write vulnerability in Windows clients prior to 14.50
Sources
Also known as GHSA-9vvg-8c87-463f.