CVE-2026-45591: ASP.NET Core Denial of Service Vulnerability
Vulnerability summary
CVE-2026-45591 is a high (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in microsoft asp.net_core. EPSS estimates a 2.48% chance of exploitation in the next 30 days, higher than 84.6% of scored vulnerabilities.
Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 2% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 17 · Related 2Timeline
- 09-06-2026PublishedVulnerability first disclosed.
- 24-09-2026Last modifiedVulnerability information updated.
Description
Uncontrolled resource consumption in ASP.NET Core allows an unauthorized attacker to deny service over a network.
CVSS metrics
7 scores · 7 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · WolfiEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · ChainguardEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · NugetEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
2.48%
Chance of exploitation in the next 30 days
Percentile
85%
Versus all other CVEs
30-day change
Increase +0.04 pp
From 2.44% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-400Uncontrolled Resource ConsumptionThe product does not properly control the allocation and maintenance of a limited resource.
- CWE-770Allocation of Resources Without Limits or ThrottlingThe product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.
Affected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Microsoft10 products
- asp.net_core≥ 8.0.0, < 8.0.28 | ≥ 9.0.0, < 9.0.17 | ≥ 10.0.0, < 10.0.9
- asp.net core 10.0≥ 10.0, < 10.0.9
- asp.net core 8.0≥ 8.0, < 8.0.28
- asp.net core 9.0≥ 9.0, < 9.0.17
- microsoft visual studio 2026 version 18.6≥ 18.6.0, < 18.6.3
Ubuntu5 products
- dotnet10< 10.0.109-10.0.9-0ubuntu1~24.04.1 | < 10.0.109-10.0.9-0ubuntu1~25.10.1 | < 10.0.109-10.0.9-0ubuntu1 | < 10.0.109-10.0.9-0ubuntu1~26.04.1
- dotnet6All versions (No fix recorded)
- dotnet7All versions (No fix recorded)
- dotnet8< 8.0.128-8.0.28-0ubuntu1~22.04.1 | < 8.0.128-8.0.28-0ubuntu1~24.04.1 | < 8.0.128-8.0.28-0ubuntu1~25.10.1
- dotnet9< 9.0.118-9.0.17-0ubuntu1~25.10.1
NuGet4 products
- Microsoft.AspNetCore.App.Runtime.linux-x64≥ 8.0.0, < 8.0.28 | ≥ 9.0.0, < 9.0.17 | ≥ 10.0.0, < 10.0.9
- Microsoft.AspNetCore.App.Runtime.osx-arm64≥ 8.0.0, < 8.0.28 | ≥ 9.0.0, < 9.0.17 | ≥ 10.0.0, < 10.0.9
- Microsoft.AspNetCore.App.Runtime.win-x64≥ 8.0.0, < 8.0.28 | ≥ 9.0.0, < 9.0.17 | ≥ 10.0.0, < 10.0.9
- Microsoft.AspNetCore.SignalR.Protocols.MessagePack≥ 8.0.0, < 8.0.28 | ≥ 9.0.0, < 9.0.17 | ≥ 10.0.0, < 10.0.9
Alpine3 products
- dotnet10-runtime< 10.0.9-r0
- dotnet8-runtime< 8.0.28-r0
- dotnet9-runtime< 9.0.17-r0
Chainguard2 products
- dotnet-bootstrap-8< 8.0.129-r0
- dotnet-bootstrap-9< 9.0.119-r0
Wolfi2 products
- dotnet-bootstrap-8< 8.0.129-r0
- dotnet-bootstrap-9< 9.0.119-r0
6 vendors · 26 products
References
31 linksShow all 31 references
- github.com/dotnet/aspnetcorePACKAGE