CVE-2026-70188: Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an una

Q: How do I fix CVE-2026-70188?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Q: Is CVE-2026-70188 being exploited?

CVE-2026-70188 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-70188 affect?

CVE-2026-70188 affects affected software. Severity is critical (CVSS 9.1). Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an unauthorized attacker to bypass a security feature over a network.

Q: How urgent is CVE-2026-70188?

Priority 60/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

This week

CRITICAL 9.1REMOTEWATCHLIST

CVE-2026-70188 is a critical-severity flaw (CVSS 9.1) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 39%)
CISA exploited list	No
Weakness	CWE-444
Published	2026-10-13
Last modified	2026-10-14

Publisher (CNA): Microsoft Corporation

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

2026-10-13 19:19 UTCPublished CVE record published
2026-10-14 04:18 UTCUpdated Record last modified

Exact fixes by distribution

NuGet (.NET) · Microsoft.AspNetCore.App.Runtime.linux-arm · FIXED · 11.0.0-rc.2 · vulnerable: >= 11.0.0-preview.1, <= 11.0.0-rc.1 · source

dotnet add package Microsoft.AspNetCore.App.Runtime.linux-arm --version 11.0.0-rc.2

NuGet (.NET) · Microsoft.AspNetCore.App.Runtime.linux-arm64 · FIXED · 11.0.0-rc.2 · vulnerable: >= 11.0.0-preview.1, <= 11.0.0-rc.1 · source

dotnet add package Microsoft.AspNetCore.App.Runtime.linux-arm64 --version 11.0.0-rc.2

NuGet (.NET) · Microsoft.AspNetCore.App.Runtime.linux-musl-arm · FIXED · 11.0.0-rc.2 · vulnerable: >= 11.0.0-preview.1, <= 11.0.0-rc.1 · source

dotnet add package Microsoft.AspNetCore.App.Runtime.linux-musl-arm --version 11.0.0-rc.2

NuGet (.NET) · Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 · FIXED · 11.0.0-rc.2 · vulnerable: >= 11.0.0-preview.1, <= 11.0.0-rc.1 · source

dotnet add package Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 --version 11.0.0-rc.2

NuGet (.NET) · Microsoft.AspNetCore.App.Runtime.linux-musl-x64 · FIXED · 11.0.0-rc.2 · vulnerable: >= 11.0.0-preview.1, <= 11.0.0-rc.1 · source

dotnet add package Microsoft.AspNetCore.App.Runtime.linux-musl-x64 --version 11.0.0-rc.2

NuGet (.NET) · Microsoft.AspNetCore.App.Runtime.linux-x64 · FIXED · 11.0.0-rc.2 · vulnerable: >= 11.0.0-preview.1, <= 11.0.0-rc.1 · source

dotnet add package Microsoft.AspNetCore.App.Runtime.linux-x64 --version 11.0.0-rc.2

Ubuntu 22.04 · dotnet6 · DEFERRED

Ubuntu 22.04 · dotnet8 · FIXED · 8.0.132-8.0.32-0ubuntu1~22.04.1

sudo apt update && sudo apt install --only-upgrade dotnet8 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' dotnet8)" ge "8.0.132-8.0.32-0ubuntu1~22.04.1" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 24.04 · dotnet8 · FIXED · 8.0.132-8.0.32-0ubuntu1~24.04.1

sudo apt update && sudo apt install --only-upgrade dotnet8 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' dotnet8)" ge "8.0.132-8.0.32-0ubuntu1~24.04.1" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 24.04 · dotnet10 · FIXED · 10.0.113-10.0.13-0ubuntu1~24.04.1

sudo apt update && sudo apt install --only-upgrade dotnet10 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' dotnet10)" ge "10.0.113-10.0.13-0ubuntu1~24.04.1" && echo PATCHED || echo STILL-VULNERABLE

RHEL 10 · dotnet8.0 · FIXED · dotnet8.0-8.0.132-1.el10_2

sudo dnf upgrade --advisory=RHSA-2026:86168 rpm -q dotnet8.0

RHEL 10 · dotnet9.0 · FIXED · dotnet9.0-9.0.122-1.el10_2

sudo dnf upgrade --advisory=RHSA-2026:86172 rpm -q dotnet9.0

RHEL 10 · dotnet10.0 · FIXED · dotnet10.0-10.0.113-1.el10_2

sudo dnf upgrade --advisory=RHSA-2026:86195 rpm -q dotnet10.0

RHEL 10.0 Extended Update Support · dotnet9.0 · FIXED · dotnet9.0-9.0.122-1.el10_0

sudo dnf upgrade --advisory=RHSA-2026:88424 rpm -q dotnet9.0

RHEL 10.0 Extended Update Support · dotnet8.0 · FIXED · dotnet8.0-8.0.132-1.el10_0

sudo dnf upgrade --advisory=RHSA-2026:88474 rpm -q dotnet8.0

Alpine 3.22 · dotnet8-runtime · FIXED · dotnet8-runtime-8.0.32-r0

apk add --upgrade dotnet8-runtime apk info -v dotnet8-runtime

Alpine 3.22 · dotnet9-runtime · FIXED · dotnet9-runtime-9.0.21-r0

apk add --upgrade dotnet9-runtime apk info -v dotnet9-runtime

Alpine 3.23 · dotnet10-runtime · FIXED · dotnet10-runtime-10.0.13-r0

apk add --upgrade dotnet10-runtime apk info -v dotnet10-runtime

Alpine 3.23 · dotnet8-runtime · FIXED · dotnet8-runtime-8.0.32-r0

apk add --upgrade dotnet8-runtime apk info -v dotnet8-runtime

Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2026-3250 · source

sudo dnf update --advisory=ALAS2023-2026-3250

Advisories and coverage

Official advisories

Amazon Linux 2023 ALAS: ALAS2023-2026-3248 (critical): dotnet9.0 2026-10-22
Amazon Linux 2023 ALAS: ALAS2023-2026-3249 (critical): dotnet10.0 2026-10-22
Amazon Linux 2023 ALAS: ALAS2023-2026-3250 (critical): dotnet8.0 2026-10-22

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-70188?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-70188 being exploited?

CVE-2026-70188 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-70188 affect?

CVE-2026-70188 affects affected software. Severity is critical (CVSS 9.1). Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an unauthorized attacker to bypass a security feature over a network.

How urgent is CVE-2026-70188?

Priority 60/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

Software pages

.NET vulnerabilities

References

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