Quick answers
- Is CVE-2026-72940 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-72940 being exploited in the wild.
- How severe is CVE-2026-72940?
- High severity, with a CVSS score of 8.8, published 8 September 2026.
- Which products and versions are affected?
- Microsoft Windows Schannel.
- Is there a fix for CVE-2026-72940?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-72940 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-72940?
- Check whether you run Microsoft Windows (Schannel). Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A heap-based buffer overflow exists in Windows Schannel, Microsoft's TLS/SSL implementation component. The vulnerability can be triggered over the network without authentication, allowing an attacker to corrupt heap memory and achieve arbitrary code execution. The attack vector is network-based with no authentication or user interaction required. A successful exploit grants the attacker code execution in the security context of the affected process, posing a critical risk to system and data integrity. Patches are available from Microsoft.
Affected products
- Microsoft Windows Schannel
Timeline
- 2026-09-08: disclosed