CVE-2026-42903
Null pointer dereference in Windows Kerberos allows an authorized attacker to deny service over a network.
CSIRTS triage
- What
- Null pointer dereference in Windows Kerberos allows an authorized attacker to deny service over a network.
- Who is affected
- Authorized users of Windows Kerberos.
- Urgency
- Remediation is important due to the medium severity and potential for denial of service.
- Action
- Apply the latest security patch from Microsoft.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch CVE-2026-42903
Get an email if CVE-2026-42903 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.
Exploitation outlook
- Low exploitation risk0.90% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 55% of all EPSS-scored CVEs.
Advisory coverage (1)
- mediumCVE-2026-42903: Windows Kerberos Denial of Service Vulnerabilitymsrc · 2026-06-09
External references
Embed the live status
— this badge updates automatically when the KEV or exploit status changes. How to embed it →
[](https://www.csirts.com/cve/CVE-2026-42903)