Vulnerability · Published Oct 13, 2026 · Assigned by microsoft

CVE-2026-88092ASP.NET Core Tampering Vulnerability

Critical 9.4

In plain English

A critical-severity security flaw in ASP.NET Core 10.0 from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 61% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.4Critical
Exploit odds (30 days)0.9%top 39.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an unauthorized attacker to perform tampering over a network.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10aspnetcore-runtime-10.010.0.13-1.el10_2ALSA-2026:86195
AlmaLinux:8aspnetcore-runtime-10.010.0.13-1.el8_10ALSA-2026:86192
AlmaLinux:9aspnetcore-runtime-10.010.0.13-1.el9_8ALSA-2026:86193
AlmaLinux:10aspnetcore-runtime-8.08.0.32-1.el10_2ALSA-2026:86168
AlmaLinux:8aspnetcore-runtime-8.08.0.32-2.el8_10ALSA-2026:86594
AlmaLinux:9aspnetcore-runtime-8.08.0.32-1.el9_8ALSA-2026:86169
AlmaLinux:10aspnetcore-runtime-9.09.0.21-1.el10_2ALSA-2026:86172
AlmaLinux:8aspnetcore-runtime-9.09.0.21-1.el8_10ALSA-2026:86170
AlmaLinux:9aspnetcore-runtime-9.09.0.21-1.el9_8ALSA-2026:86171
AlmaLinux:10aspnetcore-runtime-dbg-10.010.0.13-1.el10_2ALSA-2026:86195
AlmaLinux:8aspnetcore-runtime-dbg-10.010.0.13-1.el8_10ALSA-2026:86192
AlmaLinux:9aspnetcore-runtime-dbg-10.010.0.13-1.el9_8ALSA-2026:86193
AlmaLinux:10aspnetcore-runtime-dbg-8.08.0.32-1.el10_2ALSA-2026:86168
AlmaLinux:8aspnetcore-runtime-dbg-8.08.0.32-2.el8_10ALSA-2026:86594
AlmaLinux:9aspnetcore-runtime-dbg-8.08.0.32-1.el9_8ALSA-2026:86169
AlmaLinux:10aspnetcore-runtime-dbg-9.09.0.21-1.el10_2ALSA-2026:86172
AlmaLinux:8aspnetcore-runtime-dbg-9.09.0.21-1.el8_10ALSA-2026:86170
AlmaLinux:9aspnetcore-runtime-dbg-9.09.0.21-1.el9_8ALSA-2026:86171
AlmaLinux:10aspnetcore-targeting-pack-10.010.0.13-1.el10_2ALSA-2026:86195
AlmaLinux:8aspnetcore-targeting-pack-10.010.0.13-1.el8_10ALSA-2026:86192
AlmaLinux:9aspnetcore-targeting-pack-10.010.0.13-1.el9_8ALSA-2026:86193
AlmaLinux:10aspnetcore-targeting-pack-8.08.0.32-1.el10_2ALSA-2026:86168
AlmaLinux:8aspnetcore-targeting-pack-8.08.0.32-2.el8_10ALSA-2026:86594
AlmaLinux:9aspnetcore-targeting-pack-8.08.0.32-1.el9_8ALSA-2026:86169
AlmaLinux:10aspnetcore-targeting-pack-9.09.0.21-1.el10_2ALSA-2026:86172
AlmaLinux:8aspnetcore-targeting-pack-9.09.0.21-1.el8_10ALSA-2026:86170
AlmaLinux:9aspnetcore-targeting-pack-9.09.0.21-1.el9_8ALSA-2026:86171
AlmaLinux:8dotnet10.0.113-1.el8_10ALSA-2026:86192
AlmaLinux:10dotnet-apphost-pack-10.010.0.13-1.el10_2ALSA-2026:86195
AlmaLinux:8dotnet-apphost-pack-10.010.0.13-1.el8_10ALSA-2026:86192
AlmaLinux:9dotnet-apphost-pack-10.010.0.13-1.el9_8ALSA-2026:86193
AlmaLinux:10dotnet-apphost-pack-8.08.0.32-1.el10_2ALSA-2026:86168
AlmaLinux:8dotnet-apphost-pack-8.08.0.32-2.el8_10ALSA-2026:86594
AlmaLinux:9dotnet-apphost-pack-8.08.0.32-1.el9_8ALSA-2026:86169
AlmaLinux:10dotnet-apphost-pack-9.09.0.21-1.el10_2ALSA-2026:86172
AlmaLinux:8dotnet-apphost-pack-9.09.0.21-1.el8_10ALSA-2026:86170
AlmaLinux:9dotnet-apphost-pack-9.09.0.21-1.el9_8ALSA-2026:86171
AlmaLinux:10dotnet-host10.0.13-1.el10_2ALSA-2026:86195
AlmaLinux:9dotnet-host10.0.13-1.el9_8ALSA-2026:86193
AlmaLinux:10dotnet-hostfxr-10.010.0.13-1.el10_2ALSA-2026:86195
AlmaLinux:8dotnet-hostfxr-10.010.0.13-1.el8_10ALSA-2026:86192
AlmaLinux:9dotnet-hostfxr-10.010.0.13-1.el9_8ALSA-2026:86193
AlmaLinux:10dotnet-hostfxr-8.08.0.32-1.el10_2ALSA-2026:86168
AlmaLinux:8dotnet-hostfxr-8.08.0.32-2.el8_10ALSA-2026:86594
AlmaLinux:9dotnet-hostfxr-8.08.0.32-1.el9_8ALSA-2026:86169
AlmaLinux:10dotnet-hostfxr-9.09.0.21-1.el10_2ALSA-2026:86172
AlmaLinux:8dotnet-hostfxr-9.09.0.21-1.el8_10ALSA-2026:86170
AlmaLinux:9dotnet-hostfxr-9.09.0.21-1.el9_8ALSA-2026:86171
AlmaLinux:10dotnet-runtime-10.010.0.13-1.el10_2ALSA-2026:86195
AlmaLinux:8dotnet-runtime-10.010.0.13-1.el8_10ALSA-2026:86192
AlmaLinux:9dotnet-runtime-10.010.0.13-1.el9_8ALSA-2026:86193
AlmaLinux:10dotnet-runtime-8.08.0.32-1.el10_2ALSA-2026:86168
AlmaLinux:8dotnet-runtime-8.08.0.32-2.el8_10ALSA-2026:86594
AlmaLinux:9dotnet-runtime-8.08.0.32-1.el9_8ALSA-2026:86169
AlmaLinux:10dotnet-runtime-9.09.0.21-1.el10_2ALSA-2026:86172
AlmaLinux:8dotnet-runtime-9.09.0.21-1.el8_10ALSA-2026:86170
AlmaLinux:9dotnet-runtime-9.09.0.21-1.el9_8ALSA-2026:86171
AlmaLinux:10dotnet-runtime-dbg-10.010.0.13-1.el10_2ALSA-2026:86195
AlmaLinux:8dotnet-runtime-dbg-10.010.0.13-1.el8_10ALSA-2026:86192
AlmaLinux:9dotnet-runtime-dbg-10.010.0.13-1.el9_8ALSA-2026:86193
AlmaLinux:10dotnet-runtime-dbg-8.08.0.32-1.el10_2ALSA-2026:86168
AlmaLinux:8dotnet-runtime-dbg-8.08.0.32-2.el8_10ALSA-2026:86594
AlmaLinux:9dotnet-runtime-dbg-8.08.0.32-1.el9_8ALSA-2026:86169
AlmaLinux:10dotnet-runtime-dbg-9.09.0.21-1.el10_2ALSA-2026:86172
AlmaLinux:8dotnet-runtime-dbg-9.09.0.21-1.el8_10ALSA-2026:86170
AlmaLinux:9dotnet-runtime-dbg-9.09.0.21-1.el9_8ALSA-2026:86171
AlmaLinux:10dotnet-sdk-10.010.0.113-1.el10_2ALSA-2026:86195
AlmaLinux:8dotnet-sdk-10.010.0.113-1.el8_10ALSA-2026:86192
AlmaLinux:9dotnet-sdk-10.010.0.113-1.el9_8ALSA-2026:86193
AlmaLinux:10dotnet-sdk-10.0-source-built-artifacts10.0.113-1.el10_2ALSA-2026:86195
AlmaLinux:8dotnet-sdk-10.0-source-built-artifacts10.0.113-1.el8_10ALSA-2026:86192
AlmaLinux:9dotnet-sdk-10.0-source-built-artifacts10.0.113-1.el9_8ALSA-2026:86193
AlmaLinux:10dotnet-sdk-8.08.0.132-1.el10_2ALSA-2026:86168
AlmaLinux:8dotnet-sdk-8.08.0.132-2.el8_10ALSA-2026:86594
AlmaLinux:9dotnet-sdk-8.08.0.132-1.el9_8ALSA-2026:86169
AlmaLinux:10dotnet-sdk-8.0-source-built-artifacts8.0.132-1.el10_2ALSA-2026:86168
AlmaLinux:8dotnet-sdk-8.0-source-built-artifacts8.0.132-2.el8_10ALSA-2026:86594
AlmaLinux:9dotnet-sdk-8.0-source-built-artifacts8.0.132-1.el9_8ALSA-2026:86169
AlmaLinux:10dotnet-sdk-9.09.0.122-1.el10_2ALSA-2026:86172
AlmaLinux:8dotnet-sdk-9.09.0.122-1.el8_10ALSA-2026:86170
AlmaLinux:9dotnet-sdk-9.09.0.122-1.el9_8ALSA-2026:86171
AlmaLinux:10dotnet-sdk-9.0-source-built-artifacts9.0.122-1.el10_2ALSA-2026:86172
AlmaLinux:8dotnet-sdk-9.0-source-built-artifacts9.0.122-1.el8_10ALSA-2026:86170
AlmaLinux:9dotnet-sdk-9.0-source-built-artifacts9.0.122-1.el9_8ALSA-2026:86171
AlmaLinux:10dotnet-sdk-aot-10.010.0.113-1.el10_2ALSA-2026:86195
AlmaLinux:8dotnet-sdk-aot-10.010.0.113-1.el8_10ALSA-2026:86192
AlmaLinux:9dotnet-sdk-aot-10.010.0.113-1.el9_8ALSA-2026:86193
AlmaLinux:10dotnet-sdk-aot-9.09.0.122-1.el10_2ALSA-2026:86172
AlmaLinux:8dotnet-sdk-aot-9.09.0.122-1.el8_10ALSA-2026:86170
AlmaLinux:9dotnet-sdk-aot-9.09.0.122-1.el9_8ALSA-2026:86171
AlmaLinux:10dotnet-sdk-dbg-10.010.0.113-1.el10_2ALSA-2026:86195
AlmaLinux:8dotnet-sdk-dbg-10.010.0.113-1.el8_10ALSA-2026:86192
AlmaLinux:9dotnet-sdk-dbg-10.010.0.113-1.el9_8ALSA-2026:86193
AlmaLinux:10dotnet-sdk-dbg-8.08.0.132-1.el10_2ALSA-2026:86168
AlmaLinux:8dotnet-sdk-dbg-8.08.0.132-2.el8_10ALSA-2026:86594
AlmaLinux:9dotnet-sdk-dbg-8.08.0.132-1.el9_8ALSA-2026:86169
AlmaLinux:10dotnet-sdk-dbg-9.09.0.122-1.el10_2ALSA-2026:86172
AlmaLinux:8dotnet-sdk-dbg-9.09.0.122-1.el8_10ALSA-2026:86170
AlmaLinux:9dotnet-sdk-dbg-9.09.0.122-1.el9_8ALSA-2026:86171
AlmaLinux:10dotnet-targeting-pack-10.010.0.13-1.el10_2ALSA-2026:86195
AlmaLinux:8dotnet-targeting-pack-10.010.0.13-1.el8_10ALSA-2026:86192
AlmaLinux:9dotnet-targeting-pack-10.010.0.13-1.el9_8ALSA-2026:86193
AlmaLinux:10dotnet-targeting-pack-8.08.0.32-1.el10_2ALSA-2026:86168
AlmaLinux:8dotnet-targeting-pack-8.08.0.32-2.el8_10ALSA-2026:86594
AlmaLinux:9dotnet-targeting-pack-8.08.0.32-1.el9_8ALSA-2026:86169
AlmaLinux:10dotnet-targeting-pack-9.09.0.21-1.el10_2ALSA-2026:86172
AlmaLinux:8dotnet-targeting-pack-9.09.0.21-1.el8_10ALSA-2026:86170
AlmaLinux:9dotnet-targeting-pack-9.09.0.21-1.el9_8ALSA-2026:86171
AlmaLinux:10dotnet-templates-10.010.0.113-1.el10_2ALSA-2026:86195
AlmaLinux:8dotnet-templates-10.010.0.113-1.el8_10ALSA-2026:86192
AlmaLinux:9dotnet-templates-10.010.0.113-1.el9_8ALSA-2026:86193
AlmaLinux:10dotnet-templates-8.08.0.132-1.el10_2ALSA-2026:86168
AlmaLinux:8dotnet-templates-8.08.0.132-2.el8_10ALSA-2026:86594
AlmaLinux:9dotnet-templates-8.08.0.132-1.el9_8ALSA-2026:86169
AlmaLinux:10dotnet-templates-9.09.0.122-1.el10_2ALSA-2026:86172
AlmaLinux:8dotnet-templates-9.09.0.122-1.el8_10ALSA-2026:86170
AlmaLinux:9dotnet-templates-9.09.0.122-1.el9_8ALSA-2026:86171
AlmaLinux:10netstandard-targeting-pack-2.19.0.122-1.el10_2ALSA-2026:86172
AlmaLinux:8netstandard-targeting-pack-2.19.0.122-1.el8_10ALSA-2026:86170
AlmaLinux:9netstandard-targeting-pack-2.19.0.122-1.el9_8ALSA-2026:86171
Alpine:v3.23dotnet10-runtime10.0.13-r0ALPINE-CVE-2026-88092
Alpine:v3.24dotnet10-runtime10.0.13-r0ALPINE-CVE-2026-88092
Alpine:v3.22dotnet8-runtime8.0.32-r0ALPINE-CVE-2026-88092
Alpine:v3.23dotnet8-runtime8.0.32-r0ALPINE-CVE-2026-88092
Alpine:v3.24dotnet8-runtime8.0.32-r0ALPINE-CVE-2026-88092
Alpine:v3.22dotnet9-runtime9.0.21-r0ALPINE-CVE-2026-88092
Alpine:v3.23dotnet9-runtime9.0.21-r0ALPINE-CVE-2026-88092
Alpine:v3.24dotnet9-runtime9.0.21-r0ALPINE-CVE-2026-88092
NuGetmicrosoft.aspnetcore.app.runtime.linux-arm11.0.0-rc.2GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.linux-arm10.0.13GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.linux-arm8.0.32GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.linux-arm9.0.21GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.linux-arm649.0.21GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.linux-arm6411.0.0-rc.2GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.linux-arm6410.0.13GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.linux-arm648.0.32GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.linux-musl-arm10.0.13GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.linux-musl-arm8.0.32GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.linux-musl-arm11.0.0-rc.2GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.linux-musl-arm9.0.21GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.linux-musl-arm649.0.21GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.linux-musl-arm6410.0.13GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.linux-musl-arm6411.0.0-rc.2GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.linux-musl-arm648.0.32GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.linux-musl-x6411.0.0-rc.2GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.linux-musl-x649.0.21GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.linux-musl-x6410.0.13GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.linux-musl-x648.0.32GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.linux-x6410.0.13GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.linux-x648.0.32GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.linux-x6411.0.0-rc.2GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.linux-x649.0.21GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.osx-arm649.0.21GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.osx-arm648.0.32GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.osx-arm6411.0.0-rc.2GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.osx-arm6410.0.13GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.osx-x6410.0.13GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.osx-x6411.0.0-rc.2GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.osx-x648.0.32GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.osx-x649.0.21GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.win-arm6410.0.13GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.win-arm649.0.21GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.win-arm6411.0.0-rc.2GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.win-arm648.0.32GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.win-x649.0.21GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.win-x6410.0.13GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.win-x648.0.32GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.win-x6411.0.0-rc.2GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.win-x8611.0.0-rc.2GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.win-x869.0.21GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.win-x868.0.32GHSA-rv87-ccxw-8ggf
NuGetmicrosoft.aspnetcore.app.runtime.win-x8610.0.13GHSA-rv87-ccxw-8ggf
Rocky Linux:10dotnet10.00:10.0.113-1.el10_2RLSA-2026:86195
Rocky Linux:8dotnet10.00:10.0.113-1.el8_10RLSA-2026:86192
Rocky Linux:9dotnet10.00:10.0.113-1.el9_8RLSA-2026:86193
Rocky Linux:10dotnet8.00:8.0.132-1.el10_2RLSA-2026:86168
Rocky Linux:8dotnet8.00:8.0.132-2.el8_10RLSA-2026:86594
Rocky Linux:9dotnet8.00:8.0.132-1.el9_8RLSA-2026:86169
Rocky Linux:10dotnet9.00:9.0.122-1.el10_2RLSA-2026:86172
Rocky Linux:8dotnet9.00:9.0.122-1.el8_10RLSA-2026:86170
Rocky Linux:9dotnet9.00:9.0.122-1.el9_8RLSA-2026:86171
Ubuntu:24.04:LTSdotnet1010.0.113-10.0.13-0ubuntu1~24.04.1USN-8942-1
Ubuntu:24.04:LTSdotnet1010.0.113-10.0.13-0ubuntu1~24.04.1UBUNTU-CVE-2026-88092
Ubuntu:26.04:LTSdotnet1010.0.113-10.0.13-0ubuntu1~26.04.1USN-8942-1
Ubuntu:26.04:LTSdotnet1010.0.113-10.0.13-0ubuntu1~26.04.1UBUNTU-CVE-2026-88092
Ubuntu:26.10dotnet1010.0.113-10.0.13-0ubuntu1~26.10.1USN-8942-1
Ubuntu:26.10dotnet1010.0.113-10.0.13-0ubuntu1~26.10.1UBUNTU-CVE-2026-88092
Ubuntu:26.10dotnet1111.0.100-11.0.0~rc2-0ubuntu1~26.10.1UBUNTU-CVE-2026-88092
Ubuntu:26.10dotnet1111.0.100-11.0.0~rc2-0ubuntu1~26.10.1USN-8942-1
Ubuntu:22.04:LTSdotnet6no fix listedUBUNTU-CVE-2026-88092
Ubuntu:22.04:LTSdotnet7no fix listedUBUNTU-CVE-2026-88092
Ubuntu:22.04:LTSdotnet88.0.132-8.0.32-0ubuntu1~22.04.1UBUNTU-CVE-2026-88092
Ubuntu:22.04:LTSdotnet88.0.132-8.0.32-0ubuntu1~22.04.1USN-8942-1
Ubuntu:24.04:LTSdotnet88.0.132-8.0.32-0ubuntu1~24.04.1USN-8942-1
Ubuntu:24.04:LTSdotnet88.0.132-8.0.32-0ubuntu1~24.04.1UBUNTU-CVE-2026-88092

Affected products (as reported)

VendorProductVersions
Microsoft ASP.NET Core 10.0 10.0 – before 10.0.13
Microsoft ASP.NET Core 11.0 11.0 – before 11.0.0-rc.2
Microsoft ASP.NET Core 8.0 8.0 – before 8.0.32
Microsoft ASP.NET Core 9.0 9.0 – before 9.0.21
Microsoft Microsoft Visual Studio 2022 version 17.14 17.14.0 – before 17.14.42
Microsoft Microsoft Visual Studio 2026 version 18.10 18.10.0 – before 18.10.4

Weakness: CWE-444 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C

References