CVE-2026-13117
Description
A flaw was found in OpenVPN. An incomplete guard allows remote authenticated peers to trigger a use-after-free vulnerability during TLS (Transport Layer Security) session promotion. This can lead to a denial of service, making the service unavailable, or memory leakage, which could potentially expose sensitive information.
Statement
Moderate: This flaw in OpenVPN allows a remote authenticated peer to trigger a use-after-free during TLS session promotion, leading to a denial of service or memory leakage. The high attack complexity and requirement for prior authentication limit the immediate risk, but successful exploitation could disrupt VPN services or expose sensitive information.
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Memory
If the expired pointer is used in a read operation, an attacker might be able to control data read in by the application.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
If the expired pointer references a memory location that is not accessible to the product, or points to a location that is "malformed" (such as NULL) or larger than expected by a read or write operation, then a crash may occur.
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
If the expired pointer is used in a function call, or points to unexpected data in a write operation, then code execution may be possible.
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