CVE-2026-45591
Published: 09 June 2026
Summary
CVE-2026-45591 is a high-severity Uncontrolled Resource Consumption (CWE-400) vulnerability. Its CVSS base score is 7.5 (High).
Operationally, ranked in the top 49.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2026-45591 is an uncontrolled resource consumption vulnerability, tracked as CWE-400, that affects ASP.NET Core. It received a CVSS 3.1 base score of 7.5 reflecting network attack vector, low attack complexity, and no required privileges or user interaction, with the impact limited to high availability loss.
An unauthenticated remote attacker can send crafted network requests to trigger excessive resource consumption, resulting in denial of service against the affected ASP.NET Core application or service.
The sole reference points to the Microsoft Security Response Center advisory page for CVE-2026-45591, which is the authoritative source for any official guidance. The associated EPSS score remains flat at a peak and current value of 0.0166, indicating no material increase in observed exploitation interest after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-35549
Vulnerability details
Uncontrolled resource consumption in ASP.NET Core allows an unauthorized attacker to deny service over a network.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Limiting concurrent sessions directly prevents uncontrolled resource consumption by capping the number of active sessions per user or account.
Analysis identifies uncontrolled resource consumption indicative of denial-of-service or abuse attempts.
Contingency plan testing includes resource exhaustion scenarios to verify recovery, making it harder for attackers to sustain exploits that cause uncontrolled consumption.
Updated contingency plans include current procedures to detect, contain, and recover from resource exhaustion, limiting an attacker's ability to sustain impact from uncontrolled consumption.
Alternate site allows resumption of operations if resource exhaustion at the primary site is exploited to cause unavailability.
Alternate telecommunications services enable resumption of essential functions when primary services become unavailable due to uncontrolled resource consumption.
The team can analyze and respond to resource exhaustion incidents, reducing the impact of attacks that exploit uncontrolled consumption weaknesses.
Timely maintenance support and spare parts enable rapid recovery from failures induced by uncontrolled resource consumption, shortening the impact window of denial-of-service attacks.