CVE-2026-70186 json
ASP.NET Core Denial of Service Vulnerability
published 2026-10-13 26 d ago modified 2026-10-31 8 d ago also GHSA-mf4x-w4gh-4656 , EUVD-2026-99689
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 61%
- public exploits
- 0
- none known
Summary
Deadlock in ASP.NET Core allows an unauthorized attacker to deny service over a network.
Patch / fix
- nuget Microsoft.AspNetCore.App.Runtime.linux-arm 8.0.32, 9.0.21, 10.0.13
- nuget Microsoft.AspNetCore.App.Runtime.linux-arm64 8.0.32, 9.0.21, 10.0.13
- nuget Microsoft.AspNetCore.App.Runtime.linux-musl-arm 8.0.32, 9.0.21, 10.0.13
- nuget Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 8.0.32, 9.0.21, 10.0.13
- nuget Microsoft.AspNetCore.App.Runtime.linux-musl-x64 8.0.32, 9.0.21, 10.0.13
- nuget Microsoft.AspNetCore.App.Runtime.linux-x64 8.0.32, 9.0.21, 10.0.13
- nuget Microsoft.AspNetCore.App.Runtime.osx-arm64 8.0.32, 9.0.21, 10.0.13
- nuget Microsoft.AspNetCore.App.Runtime.osx-x64 8.0.32, 9.0.21, 10.0.13
- nuget Microsoft.AspNetCore.App.Runtime.win-arm64 8.0.32, 9.0.21, 10.0.13
- nuget Microsoft.AspNetCore.App.Runtime.win-x64 8.0.32, 9.0.21, 10.0.13
- nuget Microsoft.AspNetCore.App.Runtime.win-x86 8.0.32, 9.0.21, 10.0.13
- Microsoft ASP.NET Core 10.0 10.0.13
- Microsoft ASP.NET Core 8.0 8.0.32
- Microsoft ASP.NET Core 9.0 9.0.21
- Microsoft Microsoft Visual Studio 2022 version 17.14 17.14.42
- Microsoft Microsoft Visual Studio 2026 version 18.10 18.10.4
- dotnet8 Ubuntu 22.04 LTS 8.0.132-8.0.32-0ubuntu1~22.04.1
- dotnet8 Ubuntu 24.04 LTS 8.0.132-8.0.32-0ubuntu1~24.04.1
- dotnet10 Ubuntu 24.04 LTS 10.0.113-10.0.13-0ubuntu1~24.04.1
- dotnet10 Ubuntu 26.10 10.0.113-10.0.13-0ubuntu1~26.10.1
- dotnet10 Ubuntu 26.04 LTS 10.0.113-10.0.13-0ubuntu1~26.04.1
ubuntu advisories UBUNTU-CVE-2026-70186
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
- dotnet-sdk-8.0 AlmaLinux 8 8.0.132-2.el8_10
- dotnet-hostfxr-8.0 AlmaLinux 8 8.0.32-2.el8_10
- dotnet-runtime-8.0 AlmaLinux 8 8.0.32-2.el8_10
- dotnet-sdk-dbg-8.0 AlmaLinux 8 8.0.132-2.el8_10
- dotnet-templates-8.0 AlmaLinux 8 8.0.132-2.el8_10
- aspnetcore-runtime-8.0 AlmaLinux 8 8.0.32-2.el8_10
- dotnet-runtime-dbg-8.0 AlmaLinux 8 8.0.32-2.el8_10
- dotnet-apphost-pack-8.0 AlmaLinux 8 8.0.32-2.el8_10
almalinux advisories ALSA-2026:86594ALSA-2026:86168ALSA-2026:86169ALSA-2026:86170ALSA-2026:86171ALSA-2026:86172
- dotnet8.0 Rocky Linux 10 8.0.132-1.el10_2
- dotnet9.0 Rocky Linux 10 9.0.122-1.el10_2
- dotnet10.0 Rocky Linux 10 10.0.113-1.el10_2
- dotnet8.0 Rocky Linux 9 8.0.132-1.el9_8
- dotnet9.0 Rocky Linux 9 9.0.122-1.el9_8
- dotnet10.0 Rocky Linux 9 10.0.113-1.el9_8
- dotnet9.0 Rocky Linux 8 9.0.122-1.el8_10
- dotnet10.0 Rocky Linux 8 10.0.113-1.el8_10
rocky linux advisories RLSA-2026:86168RLSA-2026:86172RLSA-2026:86195RLSA-2026:86169RLSA-2026:86171RLSA-2026:86193
- dotnet8-runtime Alpine 3.24, Alpine 3.23, Alpine 3.22 8.0.32-r0
- dotnet9-runtime Alpine 3.24, Alpine 3.23, Alpine 3.22 9.0.21-r0
- dotnet10-runtime Alpine 3.24, Alpine 3.23 10.0.13-r0
alpine advisories ALPINE-CVE-2026-70186
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-2026-70186 updated cvss 7.5
dotnet10.0: dotnet9.0: dotnet8.0: ASP.NET Core Denial of Service Vulnerability
-
Red Hat CodeReady Linux Builder EUS (v.9.6) dotnet-sdk-8.0-source-built-artifacts 8.0.132-1.el9_6, dotnet-sdk-9.0-source-built-artifacts 9.0.122-1.el9_6fixed: vendor fix RHSA-2026:88422
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Red Hat Enterprise Linux AppStream (v. 8) dotnet 10.0.113-1.el8_10, dotnet8.0 8.0.132-2.el8_10, dotnet9.0 9.0.122-1.el8_10, dotnet10.0 10.0.113-1.el8_10, dotnet-sdk-8.0 8.0.132-2.el8_10, dotnet-sdk-9.0 9.0.122-1.el8_10, +34 morefixed: vendor fix RHSA-2026:86192
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Red Hat Enterprise Linux AppStream (v. 9) dotnet8.0 8.0.132-1.el9_8, dotnet9.0 9.0.122-1.el9_8, dotnet-host 10.0.13-1.el9_8, dotnet10.0 10.0.113-1.el9_8, dotnet-sdk-8.0 8.0.132-1.el9_8, dotnet-sdk-9.0 9.0.122-1.el9_8, +34 morefixed: vendor fix RHSA-2026:86193
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Red Hat Enterprise Linux AppStream (v. 10) dotnet8.0 8.0.132-1.el10_2, dotnet9.0 9.0.122-1.el10_2, dotnet-host 10.0.13-1.el10_2, dotnet10.0 10.0.113-1.el10_2, dotnet-sdk-8.0 8.0.132-1.el10_2, dotnet-sdk-9.0 9.0.122-1.el10_2, +34 morefixed: vendor fix RHSA-2026:86195
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Red Hat Enterprise Linux AppStream E4S (v.9.4) dotnet8.0 8.0.132-1.el9_4, dotnet-host 8.0.32-1.el9_4, dotnet-sdk-8.0 8.0.132-1.el9_4, dotnet-hostfxr-8.0 8.0.32-1.el9_4, dotnet-runtime-8.0 8.0.32-1.el9_4, dotnet-sdk-dbg-8.0 8.0.132-1.el9_4, +8 morefixed: vendor fix RHSA-2026:88425
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Red Hat Enterprise Linux AppStream EUS (v. 10.0) dotnet8.0 8.0.132-1.el10_0, dotnet9.0 9.0.122-1.el10_0, dotnet-host 9.0.21-1.el10_0, dotnet-sdk-8.0 8.0.132-1.el10_0, dotnet-sdk-9.0 9.0.122-1.el10_0, dotnet-hostfxr-8.0 8.0.32-1.el10_0, +21 morefixed: vendor fix RHSA-2026:88474
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Red Hat Enterprise Linux AppStream EUS (v.9.6) dotnet8.0 8.0.132-1.el9_6, dotnet9.0 9.0.122-1.el9_6, dotnet-host 9.0.21-1.el9_6, dotnet-sdk-8.0 8.0.132-1.el9_6, dotnet-sdk-9.0 9.0.122-1.el9_6, dotnet-hostfxr-8.0 8.0.32-1.el9_6, +21 morefixed: vendor fix RHSA-2026:88422
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Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) dotnet-sdk-8.0-source-built-artifacts 8.0.132-1.el9_8, dotnet-sdk-9.0-source-built-artifacts 9.0.122-1.el9_8, dotnet-sdk-10.0-source-built-artifacts 10.0.113-1.el9_8fixed: vendor fix RHSA-2026:86193
show 4 moreshow fewer
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Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) dotnet-sdk-8.0-source-built-artifacts 8.0.132-1.el10_2, dotnet-sdk-9.0-source-built-artifacts 9.0.122-1.el10_2, dotnet-sdk-10.0-source-built-artifacts 10.0.113-1.el10_2fixed: vendor fix RHSA-2026:86195
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Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) dotnet-sdk-8.0-source-built-artifacts 8.0.132-1.el10_0, dotnet-sdk-9.0-source-built-artifacts 9.0.122-1.el10_0fixed: vendor fix RHSA-2026:88474
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Red Hat Enterprise Linux CRB (v. 8) dotnet-sdk-8.0-source-built-artifacts 8.0.132-2.el8_10, dotnet-sdk-9.0-source-built-artifacts 9.0.122-1.el8_10, dotnet-sdk-10.0-source-built-artifacts 10.0.113-1.el8_10fixed: vendor fix RHSA-2026:86192
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Red Hat Hardened Images dotnet10.0 10.0.112-1.hum1, dotnet8.0 8.0.131-0.1.hum1, dotnet9.0 9.0.121-0.1.hum1not affected: component 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
- 26 d ago
Exploit prediction
0.96% chance of exploitation in the next 30 days, higher than 61% 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 |
| GitHub | 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 |
|---|---|---|---|
| nuget | Microsoft.AspNetCore.App.Runtime.linux-arm | >=8.0.0, <8.0.32 >=10.0.0, <10.0.13 >=9.0.0, <9.0.21 |
8.0.32 10.0.13 9.0.21 |
| nuget | Microsoft.AspNetCore.App.Runtime.linux-arm64 | >=8.0.0, <8.0.32 >=10.0.0, <10.0.13 >=9.0.0, <9.0.21 |
8.0.32 10.0.13 9.0.21 |
| nuget | Microsoft.AspNetCore.App.Runtime.linux-musl-arm | >=8.0.0, <8.0.32 >=10.0.0, <10.0.13 >=9.0.0, <9.0.21 |
8.0.32 10.0.13 9.0.21 |
| nuget | Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 | >=8.0.0, <8.0.32 >=10.0.0, <10.0.13 >=9.0.0, <9.0.21 |
8.0.32 10.0.13 9.0.21 |
| nuget | Microsoft.AspNetCore.App.Runtime.linux-musl-x64 | >=8.0.0, <8.0.32 >=10.0.0, <10.0.13 >=9.0.0, <9.0.21 |
8.0.32 10.0.13 9.0.21 |
| nuget | Microsoft.AspNetCore.App.Runtime.linux-x64 | >=8.0.0, <8.0.32 >=10.0.0, <10.0.13 >=9.0.0, <9.0.21 |
8.0.32 10.0.13 9.0.21 |
| nuget | Microsoft.AspNetCore.App.Runtime.osx-arm64 | >=8.0.0, <8.0.32 >=10.0.0, <10.0.13 >=9.0.0, <9.0.21 |
8.0.32 10.0.13 9.0.21 |
| nuget | Microsoft.AspNetCore.App.Runtime.osx-x64 | >=8.0.0, <8.0.32 >=10.0.0, <10.0.13 >=9.0.0, <9.0.21 |
8.0.32 10.0.13 9.0.21 |
| nuget | Microsoft.AspNetCore.App.Runtime.win-arm64 | >=8.0.0, <8.0.32 >=10.0.0, <10.0.13 >=9.0.0, <9.0.21 |
8.0.32 10.0.13 9.0.21 |
| nuget | Microsoft.AspNetCore.App.Runtime.win-x64 | >=8.0.0, <8.0.32 >=10.0.0, <10.0.13 >=9.0.0, <9.0.21 |
8.0.32 10.0.13 9.0.21 |
| nuget | Microsoft.AspNetCore.App.Runtime.win-x86 | >=8.0.0, <8.0.32 >=10.0.0, <10.0.13 >=9.0.0, <9.0.21 |
8.0.32 10.0.13 9.0.21 |
Affected products
- Microsoft ASP.NET Core 10.0
- Microsoft ASP.NET Core 8.0
- Microsoft ASP.NET Core 9.0
- Microsoft Microsoft Visual Studio 2022 version 17.14
- Microsoft Microsoft Visual Studio 2026 version 18.10
Classification
- Weakness
-
- CWE-833 Deadlock
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2026-70186
vendor-advisory, patch, web
-
github.com
/dotnet/aspnetcore/security/advisories/GHSA-mf4x-w4gh-4656
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-70186
advisory
-
github.com
/dotnet/announcements/issues/461
web
-
github.com
/dotnet/aspnetcore
package
-
github.com
/dotnet/aspnetcore/discussions/69797
web
Sources
- CVE List CVE-2026-70186
- GitHub Advisory GHSA-mf4x-w4gh-4656
- NVD CVE-2026-70186
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.