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Fencer Vulns
high 7.5

CVE-2025-26682 json

ASP.NET Core and Visual Studio Denial of Service Vulnerability

published 2025-04-08 19 mo ago modified 2026-09-08 2 mo ago also BIT-aspnet-core-2025-26682 , EUVD-2025-10197

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 78%
public exploits
0
none known

Summary

Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Patch / fix

  • bitnami aspnet-core 8.0.15, 9.0.4
  • Microsoft ASP.NET Core 8.0 8.0.15
  • Microsoft ASP.NET Core 9.0 9.0.4
  • Microsoft Microsoft Visual Studio 2022 version 17.10 17.10.13
  • Microsoft Microsoft Visual Studio 2022 version 17.12 17.12.7
  • Microsoft Microsoft Visual Studio 2022 version 17.13 17.13.6
  • Microsoft Microsoft Visual Studio 2022 version 17.8 17.8.20
  • dotnet8 Ubuntu 22.04 LTS 8.0.115-8.0.15-0ubuntu1~22.04.1
  • dotnet8 Ubuntu 24.04 LTS 8.0.115-8.0.15-0ubuntu1~24.04.1
  • dotnet8 Ubuntu 25.10 8.0.115-8.0.15-0ubuntu1
  • dotnet9 Ubuntu 25.10 9.0.105-9.0.4-0ubuntu1

ubuntu advisories UBUNTU-CVE-2025-26682

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • dotnet8-runtime Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 8.0.15-r0
  • dotnet9-runtime Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 9.0.4-r0

alpine advisories ALPINE-CVE-2025-26682

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-26682 updated cvss 7.5

dotnet: .NET: ASP.NET Core denial of service with HTTP/3

  • Red Hat Enterprise Linux 9 dotnet6.0, dotnet7.0, dotnet-host, dotnet-sdk-6.0, dotnet-sdk-7.0, dotnet-hostfxr-6.0, +16 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 dotnet, dotnet8.0, dotnet9.0, dotnet-host, dotnet-sdk-8.0, dotnet-sdk-9.0, +24 more Red Hat Enterprise Linux 9 dotnet8.0, dotnet9.0, dotnet-sdk-8.0, dotnet-sdk-9.0, dotnet-hostfxr-8.0, dotnet-hostfxr-9.0, +21 more Red Hat Enterprise Linux 10 dotnet8.0, dotnet9.0
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
19 mo ago

Exploit prediction

1.75% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami aspnet-core
>=8.0.0, <8.0.15
>=9.0.0, <9.0.4
8.0.15
9.0.4

Affected products

  • Microsoft ASP.NET Core 8.0
  • Microsoft ASP.NET Core 9.0
  • Microsoft Microsoft Visual Studio 2022 version 17.10
  • Microsoft Microsoft Visual Studio 2022 version 17.12
  • Microsoft Microsoft Visual Studio 2022 version 17.13
  • Microsoft Microsoft Visual Studio 2022 version 17.8

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.